Determination Of Magnetic Susceptibility Research Articles

Synthesis, structure, preliminary antimicrobial and antimalarial studies of 1,1′-(piperazine-1,4-diyl)bis(2-phenylethan-1-one) and its lanthanide, Ce(III), Pr(III), and Nd(III) complexes

A dione ligand, 1,1′-(piperazine-1,4-diyl)bis(2-phenylethan-1-one) derived from the reaction of phenylacetylchloride with piperazine and the lanthanides, Ce(III), Nd(III), and Pr(III) complexes of general formula [LnL(NO3)2]NO3 were synthesized. The compounds were characterized by conventional NMR, Mass Infra-Red and UV–vis spectroscopic techniques, melting point, elemental analysis, conductivity, thermogravimetric analysis, magnetic susceptibility, and single X-ray structure determination of the ligand. In vitro, antimicrobial studies indicated that the ligand is active against Staphylococcus aureus, Bacillus Sublitis, Salmonella typhi, and Streptococcus pneumonae. The Ce(III) and Pr(III) complexes were active against all the microorganisms except A. Niger and Pseudomonas aeruginosa whereas the Ce(III) complex showed activity against Staphylococcus aureus, Bacillus Sublitis, and Streptococcus pneumonae. The In vivo anti-plasmodial assay of infected rats indicated that the ligand and Nd(III), Pr(III) complexes have high antiplasmodial potency in comparison to the antimalarial medicine Artesunate. In corroboration with findings on the enhanced antimicrobial properties of the complexes, binding energies from molecular docking correlated strongly with the inhibition zone diameter for Staphylococcus aureus and density functional theoretical studies suggest the presence of the metals account for the improved properties in the following order: Nd(III) > Pr(III) > Ce(III).

Determination of Magnetic susceptibility of hydrocarbon contaminated soils in Port Harcourt and Bonny Island, Rivers State, Nigeria

In this study, determination of magnetic susceptibility were carried out on 366 soil samples using MS2B magnetic susceptibility meter connected to a computer system using MULTISUS2 software. The soil samples were selected from six sites namely: Shell environment, Nigeria Liquefied Natural Gas environment, Port Harcourt Refining Company James Hart, New Jerusalem and Port Harcourt respectively. Three of the six sites; Shell, NLNG and Port-Harcourt Refining Company environments have their soils contaminated with hydrocarbon. One hundred and ninety two (192) soil samples were collected from these hydrocarbon contaminated sites and 174 from non-hydrocarbon contaminated soil (control samples). The magnetic susceptibility values obtained from Shell environment and for hydrocarbon samples showed higher (enhanced) magnetic susceptibility with average values of 117.54x10-8 m3kg-1 and 2016.39x10-8 m3kg-1 and a moderate magnetic susceptibility for with an average value of 20.83x10-8 m3kg-1 in comparison to magnetic susceptibility values obtained from the control samples whose average values were 2.39x10-8 m3kg-1, 12.42x10-8 m3kg-1 and 3.31x10-8 m3kg-1 for James Hart, New Jerusalem and Port Harcourt respectively. This means that the hydrocarbon sites are highly magnetic which could be indication of pollution. The results of the percentage frequency dependent susceptibility (χFD%) obtained in the hydrocarbon samples showed about 16% of the samples had percentage frequency dependent susceptibility (χFD%) values between 0-2%, 53% had values of χFD% between 2-10% and 31% had χFD% between 10-12% and above while about 21% of the control samples had χFD% values between 0-2%, 58% between 2-10% and 21% between 10-12% and above. The high magnetic susceptibility value in the hydrocarbon soil samples is an indication of pollution due to hydrocarbon deposit. The Government is therefore advised to monitor the location and activities of the oil companies and initiate quick mop up strategies should be put in place in the eventuality of oil spillage.

Petroarcheologický výzkum tří nefritových seker z Moravy a českého Slezska

In 1989, 2002 and 2021, three axes were found in Moravia and Czech Silesia, which share a similar appearance and typology. Two of these axes (Bolatice near Opava, Hlinsko near Lipník nad Bečvou) can be dated to the Early Eneolithic (Funnel Beaker Culture), while the third (Archlebov near Ždánice) was a surface find in an area with pottery fragments corresponding to the Moravian Painted Ware Culture. The raw material used in the axes is almost macroscopically identical and has a striking mottled colour. Mineralogical methods (determination of magnetic susceptibility and density, X-ray diffraction record) were used for classification. The methods proved the raw material was nephrite with a significant presence of clinopyroxene. Our comparison with nephrite occurrences in Central Europe has shown the nephrite source at Jordanów Śląski in Polish Silesia to be the most probable source

Геоинформационное картографирование эколого-магнитного состояния почв г. Краснокамска

The article is devoted to geoinformation mapping of the ecological and magnetic state of soils in the city of Krasnokamsk. The study included point determinations of the volumetric magnetic susceptibility of soils and the concentration of heavy metals, followed by mathematical-cartographic modeling of the results obtained. Mapping the magnetic susceptibility of soils makes it possible to form areas of the ecological and magnetic state of soils, along which samples are taken for the determination of heavy metals. Thus, the sample size of soil samples for heavy metal studies is reduced without a significant decrease in the representativeness of the final results, which determines the relevance of the studies performed. The purpose of the research is geoinformation mapping of the ecological and magnetic state of soils in the central part of the city of Krasnokamsk. The boundaries of research from the south are limited by the industrial zone of the city, which is mainly represented by pulp and paper industry enterprises. In the eastern part of the survey area, Zakamskaya CHPP-5 and a machine-building plant are located. The soil cover of Krasnokamsk is represented by urbanozems and technogenic surface formations. The total number of magnetic susceptibility measurement points was 77, and heavy metals were determined in 10 samples. During processing spatial data, the methods of mathematical-cartographic modeling, spatial overlay and binary classification were used. The interpolation was performed by the geostatistical method ordinary kriging using the Spatial Analyst tool of the ArcGIS 10.8 program. The creation of the Web GIS “Geoinformation system of magnetic susceptibility and heavy metals in the soils of Krasnokamsk” was performed on the basis of QGIS open geotechnologies using the qgis2web tool, the VS Code code editor. The Web GIS is hosted on the free GitHub platform. Based on the results of mapping, soil contamination with nickel and copper was established. The total area of pollution was 0.55 km2.

Particle-based characterization and classification to evaluate the behavior of iron ores in drum-type wet low-intensity magnetic separation

Magnetic separation is a versatile technique widely used in the mining industry. Drum-type wet low-intensity magnetic separation (WLIMS) represents the backbone of the iron ore upgrading circuits since the mid 19th century. However, it has been traditionally applied through guidelines that commonly disregard the ore properties and their interaction with the operating conditions to influence the final process selectivity. This work describes a three-stage methodology to achieve the comprehensive characterization and classification of an iron ore, seeking to recognize links between the ore properties and operating conditions, and their influence upon the process performance. This methodology integrates 1) laboratory testing, 2) particle-scale characterization of the ore and products from separation trials, and 3) data analysis to identify and categorize the particle attributes that control their behavior in a laboratory-scale magnetic separator. Dry sieving, Saturation Magnetization Analyzer (SATMAGAN) and Mineral Liberation Analysis (MLA) represent the basis to collect quantitative particle-level information for clustering the ore into classes of unique nature. The further determination of the volumetric magnetic susceptibility by particle class, together with the relative probability of particle capture, provides valuable insight on the ore magnetic behavior. The calculation of particle-classed partition coefficients resulted practical to assess the process selectivity in terms of particle attributes and operating conditions. The methodology proposes guidelines to comprehend the behavior of an ore from a particle-scale perspective. Moreover, the acquired data can be used for geometallurgical and process modeling, which represent promising forecasting tools to support decision-making in plants.

Картографирование магнитной восприимчивости почв г. Чайковский

The article presents the results of an assessment of the heterogeneity of the volumetric magnetic susceptibility of soils in the city of Chaikovsky, Perm Territory, based on the results of its spatial modeling. Determination of magnetic susceptibility makes it possible to estimate the concentration of technogenic magnetic particles in urban soils. Their sources in the atmosphere and soil cover of urbanized landscapes are emissions from vehicles, thermal power plants, and industrial enterprises. The non-stoichiometric technogenic magnetite-maghemite complex of minerals in urban soils has an abnormally high magnetic susceptibility and contains potentially dangerous chemical elements belonging to the heavy metals (HM) group in the composition of the crystal lattice of magnetic particles. Cartographic materials make it possible to assess the environmental risk for city residents, identify unfavorable areas and conduct a spatial analysis of the relationship between their location and pollution sources. The purpose of the research is spatial modeling of the magnetic susceptibility of soils in the city of Chaikovsky. The research area covers a section of the city with a total area of 22 km². Spatial modeling was carried out using geostatistical and deterministic methods based on 140 points. As a result of cross-validation, it was found that the most accurate interpolation method is “Ordinary Kriging” with the help of which the boundaries of the contaminated areas of the city of Chaikovsky are established. Within these boundaries, soil samples were taken, in which the content of nickel, copper, zinc, and lead was determined. According to the data obtained, areas with high magnetic susceptibility of soils have higher concentrations of heavy metals. To bring the research results to the administration and residents of the city, a Web GIS application has been developed, access to which is organized through the GitHub platform.

Магнетизм корінних порід та магнітна сприйнятливість ґрунту

Information support of modern agriculture and ecology forms a demand for ever higher requirements for efficiency and density of the sampling network. This fact determines the spread of high-performance methods of soil research, among which are magnetometric ones. However, these methods have a number of limitations associated with the existence in soils of ferromagnets of non-pedogenic nature. The purpose of the study is to show the patterns of spatial and profile distribution of soils with high values of magnetic characteristics, inherited from parent rocks as a result of pedogenesis. The research used: determination of specific magnetic susceptibility using kappabridge KLY-2, determination of volumetric magnetic susceptibility with kappameter KT-5 and induction of magnetic field by proton magnetometer MP 203. The study was conducted at two objects located in the central part of the Ukrainian shield region. Studies have shown that soils developed on the weathering crust are characterized by certain features of their magnetic properties. First of all, it depends on the petromagnetic parameters of the source rocks. On magnetic rocks, the MS of soils is determined primarily by inherited magnetic minerals. The magnetic susceptibility of such soils has two maxima. The first is in the upper part of the profile, where it is determined by the sum of pedogenic and terrigenous magnets. The second is located in the lower part of the profile, which consists almost entirely of weathering products.

ДО ПИТАННЯ КОМПЛЕКСУВАННЯ ГЕОФІЗИЧНИХ ТА АГРОХІМІЧНИХ МЕТОДІВ ДОСЛІДЖЕНЬ СХИЛОВИХ ЗЕМЕЛЬ

The increasing of the soil degradation of agricultural lands in Ukraine requires the improvement of their survey system. First of all, it is related to the increase of the accuracy of determinations and the density of the measurement grid. To perform these tasks, new methods are involved, primarily the geophysics ones. There are certain advantages of the integration of the studies as well as development of the substantiated rational combination of methods. Recently, promising results of the application of the magnetic susceptibility of soil to characterize the agronomic properties have been obtained. This study shows the results of the integrated application of a number of agrochemical methods and determinations of mass-specific magnetic susceptibility (MS) on the example of podzolized chernozems of Kharkiv district of Kharkiv region. We identified the possibilities of culling of values of soil characteristics from the proceeding of the results of definition of MS. The nature of the correlation between MS and humus content allows us to recommend the replacement of more expensive determination of humus content with cheaper MS. Soil magnetic susceptibility correctly reflects the spatial distribution of the main indicators of eroded lands: the humus content, and physical clay. We propose the study of sloping lands with more optimal techniques of the MS measurement of the soil as the most accessible tool.

Seeking the Sources of Dust: Geochemical and Magnetic Studies on “Cryodust” in Glacial Cores from Southern Spitsbergen (Svalbard, Norway)

Natural mineral particulate matter deposited from aerosols and trapped in glaciers—herein defined as “cryodust”—may be an excellent indicator of atmospheric circulation, if terrestrial sources of dust can be identified. In this study, we analyzed the composition of cryodust in shallow ice cores taken from five glaciers in Southern Spitsbergen (Svalbard Archipelago, Northern Norway). The chemical composition, magnetic properties and radiogenic ages of individual grains were measured, where possible, to provide indicators of source areas. To identify mineral and rock fragments, solid particulates were examined by Scanning Electron Microscope fitted with a backscattered electron and Energy Dispersive Spectroscopic detectors. An Electron MicroProbe was employed for the U-Th-Pb chemical dating of monazite grains. Magnetic measurements comprised analyses of magnetic susceptibility (κ) vs. temperature (T) variations and determination of magnetic hysteresis parameters. Monazite ages span 445–423 Ma, consistent with mineral growth during the Caledonian orogeny. Caledonian rocks are exposed in the Nordaustlandet area of North-Eastern Svalbard, and this is the most probable source for monazite grains. Magnetic analyses show a predominance of ferrous (FeII) over ferric (FeIII) phases, consistent with a lack of input from subtropical sources. The results from both methods are consistent with local sources of dust from exposures in the Svalbard archipelago.

Theoretical determination of polarizability and magnetic susceptibility of neon

We report theoretical determination of the dipole polarizability of the neon atom, including its frequency dependence. Corrections for the relativistic, quantum electrodynamics, finite nuclear mass, and finite nuclear size effects are taken into account. We obtain the value $\alpha_0=2.66080(36)$ for the static polarizability, and $\alpha_2=2.850(7)$ and $\alpha_4=4.932(14)$ for the first two polarizability dispersion coefficients (Cauchy moments); all values are in atomic units (a.u.). In the case of static polarizability, our result agrees with the best experimental determination [C. Gaiser and B. Fellmuth, Phys. Rev. Lett. 120, 123203 (2018)], but our estimated uncertainty is significantly larger. For the dispersion coefficients, the results obtained in this work appear to be the most accurate to date overall compared to published theoretical and experimental data. We also calculated the static magnetic susceptibility of the neon atom, needed to obtain the refractive index of gaseous neon. Our result, $\chi_0 = -8.484(19) \cdot 10^{-5}$ a.u., is about 9% larger in absolute value than the recommended experimental value [CRC Handbook of Chemistry and Physics, CRC Press, 2019, p. 4-145].

Determination of Magnetic susceptibility of hydrocarbon contaminated soils in Port Harcourt and Bonny Island, Rivers State, Nigeria

In this study, determination of magnetic susceptibility were carried out on 366 soil samples using MS2B magnetic susceptibility meter connected to a computer system using MULTISUS2 software. The soil samples were selected from six sites namely: Shell environment, Nigeria Liquefied Natural Gas environment, Port Harcourt Refining Company James Hart, New Jerusalem and Port Harcourt respectively. Three of the six sites; Shell, NLNG and Port-Harcourt Refining Company environments have their soils contaminated with hydrocarbon. One hundred and ninety two (192) soil samples were collected from these hydrocarbon contaminated sites and 174 from non-hydrocarbon contaminated soil (control samples). The magnetic susceptibility values obtained from Shell environment and for hydrocarbon samples showed higher (enhanced) magnetic susceptibility with average values of 117.54x10-8 m3kg-1 and 2016.39x10-8 m3kg-1 and a moderate magnetic susceptibility for with an average value of 20.83x10-8 m3kg-1 in comparison to magnetic susceptibility values obtained from the control samples whose average values were 2.39x10-8 m3kg-1, 12.42x10-8 m3kg-1 and 3.31x10-8 m3kg-1 for James Hart, New Jerusalem and Port Harcourt respectively. This means that the hydrocarbon sites are highly magnetic which could be indication of pollution. The results of the percentage frequency dependent susceptibility (χFD%) obtained in the hydrocarbon samples showed about 16% of the samples had percentage frequency dependent susceptibility (χFD%) values between 0-2%, 53% had values of χFD% between 2-10% and 31% had χFD% between 10-12% and above while about 21% of the control samples had χFD% values between 0-2%, 58% between 2-10% and 21% between 10-12% and above. The high magnetic susceptibility value in the hydrocarbon soil samples is an indication of pollution due to hydrocarbon deposit. The Government is therefore advised to monitor the location and activities of the oil companies and initiate quick mop up strategies should be put in place in the eventuality of oil spillage.

An alpine meadow soil chronology based on OSL and radiocarbon dating, Qinghai Lake, northeastern Tibetan Plateau

Extensive alpine meadow soil on the Tibetan Plateau (TP) plays a core role in the local ecological system, however, its ages of formation and pedogenic processes are relatively poorly understood. In this study, we reconstructed a soil development chronology for two alpine meadow soil sections on Riyue Mountain, southeast of Qinghai Lake (QHL), using quartz optically stimulated luminescence (OSL) and potassium-rich feldspar (K-feldspar) post-infrared infrared stimulated luminescence (post-IR IRSL, pIRIR) techniques. In addition, accelerator mass spectrometry 14C analysis of soil organic matter (SOM) was used to date alpine meadow soil profiles on Xiangpi Mountain, southwest of QHL. Bulk samples were collected from Riyue Mountain profiles for determination of soil grain size and magnetic susceptibility. The results show: (1) Consistency of quartz OSL and K-feldspar pIRIR ages, indicating both the quartz OSL and K-feldspar pIRIR signal for alpine meadow soil samples are well bleached before burial. (2) SOM radiocarbon ages most likely underestimate sample age due to modern organic contamination from plant roots. (3) A lower limit on alpine meadow soil development after the last deglaciation based on OSL dating of bottom deposits, and an upper limit of before 1450 ± 80 cal BP from radiocarbon dating of the upper SOM; alpine meadow soils developed mainly during the late Holocene (4–0 ka) on the mountains around QHL. (4) The grain size characteristics of alpine meadow soil are similar to atmospheric dust and loess at QHL; the rapid aeolian accumulation in the late Holocene implies conditions of relative arid and cold climate.

Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia

This study investigated the quality of Kupa River sediment using sequential extraction, ecological risk, and contamination indexes (Risk assessment code, Index of geoaccumulation, Enrichment factor, Ecological risk factor, Ecological risk index), determination of magnetic susceptibility of sediments, and statistical methods. The BCR sequential extraction technique was used for evaluating various element-binding forms. Most of the elements were considered to be immobile due to the high availability in the residual fraction. Lead was present mainly in the reducible fraction, while more easily mobile and bioavailable forms were predominant for cadmium and barium. Sediment samples from the river catchment exhibited low ecological risk. The most toxic element, Cd, is the main contributor to the total potentially ecological risk. Increased values of contamination factors have been observed for Zn, Cr, and Ba in some localities. Results of the comparison of element contents in sediments in a 15-year period (2018 vs. 2003) indicated that the situation with toxic element content in sediments along Kupa River improved formost of its course. Unfortunately, on the lower course of the river, the situation has worsened. Using the example of Kupa River sediments, it was shown that the magnetic susceptibility method is excellent indetecting increased values of Cr.

Application of a Novel Magnetic Balance in the Determination of Magnetic Susceptibility of Complex Compounds

Application of a Novel Magnetic Balance in the Determination of Magnetic Susceptibility of Complex Compounds

The Role of Magnetic Susceptibility in Detecting Iron Poisoning in FCC Equilibrium Catalyst Samples and Its Combination with Other Macroscopic Bulk Analysis Techniques

In the last years, iron poisoning has gained more attention in fluid catalytic cracking operations across the globe. While more and more insights into the mechanisms of its deactivating effects on FCC catalyst particles are available, the early detection of Fe poisoning of FCC catalysts is complicated by the various sources of Fe. This paper describes the use of magnetic susceptibility determinations and digital microscopy for this purpose. The application of magnetic susceptibility shows that the magnetic properties of FCC catalysts change at about 0.30 wt % added Fe indicating that the deleterious effects of the contaminant Fe occur beyond this limit. The combination with inverse gas chromatography and mercury porosimetry determinations confirm the pore restricting effects by Fe poisoning.

Soil salinization processes in small-lake Ballestera wetland ecosystem (La Lantejuela, Seville, Spain)

Salinization processes in soils with thermo-mediterranean-semiarid conditions within a confined environment (basin closed) are studied in Natural Reserve Ballestera small-lake ecosystems (Seville, Spain). Methodologically it is carried out a geopedological catena integrated by five drilling-profiles with depths between 0.20 and 1.50 m. A total of 21 pedo-sedimentary samples have been characterized through pH, electric conductivity, carbonates contents, magnetic susceptibility and texture determinations. The results show the presence of two different phases in the geopedological evolution of the ecosystem: one of them is previous to the geomorphological constitution of the existing wetland, characterized by carbonates and salts lateral lixiviation processes (vertisolization-tirsification processes determinant of a special black color in the soil), and the second one, later and current, distinguishing processes of salt accumulation (saline brines) and surface crust formations (saltcrete) of halite and gypsum with high value of electric conductivity (salinization and hydromorphic processes).

High resolution dating of loess profile from Strzyżów (Horodło Plateau-Ridge, Volhynia Upland)

The Strzyżów loess profile is located close to the Polish-Ukrainian border in the northern part of the Horodło Plateau-Ridge, which is a latitudinal cretaceous hump with thick (10–30 m) loess cover. From the north and south the region is limited by distinct morphological edges up to over 10 m high. The loess sequence at Strzyżów is located at the height of 216 m above sea level in the northern margin of the loess cover, close to the Bug River about 40 m above the modern valley bottom. The Strzyżów loess profile has not been investigated so far because it was discovered at the end of 2013 and in our investigations it was proved that it does not contain all the units characteristic for Late Pleistocene loess-soil sequences. Above the palaeosol S1 we can only distinguish about 13 m of L1LL1 loess deposits with the modern soil on top. There are no remains of the L1SS1 soil or the L1LL2 loess deposits. Nineteen samples were collected from the almost 14 m loess profile in Strzyżów (λ = 24°0′E, φ = 50°51′N). Combined post-infrared infrared stimulated luminescence (post-IR IRSL for the deepest part of the profile) and blue light stimulated luminescence dating were applied to the polymineral fine grains (4–11 μm) and medium grained quartz fraction (45–63 μm). The obtained OSL (optically stimulated luminescence) chronostratigraphy was also confirmed by radiocarbon dating. Ages obtained for different fractions are very similar and only the result from one sample from the S1 soil is substantially different. For a more complete picture of the changes in this profile, dating results have been complemented by grain-size distribution, carbonate and organic carbon contents, geochemical composition and magnetic susceptibility determinations.

A Novel Approach for Determining the Electromagnetic Properties of a Colloidal Fluid With Magnetic Nanoparticles for Hyperthermia Applications

The paper presents a general analytical method for evaluating the magnetic properties of colloidal fluid with magnetic nanoparticles and agar through in vitro specific absorption rate (SAR) measurements. The approach for the determination of magnetic complex susceptibility herein presented reveals itself as simple, rapid, broadband, and accurate enough to compete with alternative conventional direct methods requiring complex and expensive instrumentation. In particular, it makes use of indirect equations based on the single-order Debye model [linear response theory (LRT)] combined with a punctual set of in vitro SAR measurements. The procedure is effective inside the range of validity of the LRT theory, and it can be easily applied in the up-growing field of magnetic hyperthermia studies.

Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particles

In Faraday's magnetometer it is recommended to apply remotely the located poles hemispheres. In this case (and similar cases) there is a need for expeditious and exact positioning of the measuring sensor (Hall) and the studied sample – for obtaining the most authentic characteristics of induction and its gradient, identification and use of a zone of stability. This problem is solved by the corresponding opticalmechanical system of positioning. It consists of the laser modules promoting aim positioning, the Web camera promoting final positioning. On the received concentration dependences of magnetic susceptibility of powder samples existence of limited line sections is confirmed that gives the chance to define susceptibility of particles. The critical relation to use for the similar purposes of samples (disperse) in the form of colloids and suspensions expresses.

Molecular structures of cobalt complexes of 2-aza-2-[p-methylbenzyl]-5,10,15,20-tetraphenyl-21-carbaporphyrin: [Co(2-NCH2-p-C6H4CH3-21-m-CH2C6H4CH3NCTPP)L] (L = Cl−, N*CS−)

Two experimentally well characterized four-coordinate complexes of the general formula [Co(2-NCH2-p-C6H4CH3-21-m-CH2C6H4CH3NCTPP)L] (with L = Cl− and N*CS− for 3 and 4) are considered for this study. The crystal structures of the paramagnetic chloro(2-aza-2-[p-methyl benzyl]-5,10,15,20-tetraphenyl-21-m-xylyl-21-carbaporphyrinato-N,N′,N″) cobalt(II) octane solvate [Co(2-NCH2-p-C6H4CH3-21-m-CH2C6H4CH3NCTPP)Cl]·0.5C8H18 (3·0.5 C8H18) and thiocyanato-N-(2-aza-2-[p-methylbenzyl]-5,10,15,20-tetraphenyl-21-m-xylyl-21-carbaporphyrinato-N,N′,N″) cobalt(II) [Co(2-NCH2-p-C6H4CH3-21-m-CH2C6H4CH3NCTPP)(NCS)] (4) were established. The geometry around the Co2+ ion in 3·0.5 C8H18 (or 4) is a distorted tetrahedron, with C2v symmetry. The magnitude of the zero-field splitting (ZFS) parameter (D) was reported to change from 44.5 cm−1 in 3 to 30.0 cm−1 in 4 through DC magnetic susceptibility determinations. The |D| value can be related to the magnitude of the ligand-field splitting parameter of the axial k-donating Cl− ligand of 3 and the axial π-accepting NCS− ligand of 4 at the cobalt sites.