Compounds In Dimethylsulfoxide Research Articles

A o-phenanthroline-based metal-organic framework for fluorescence sensing toward CrVI and antibiotics in aqueous phase

Herein, a novel o-phenanthroline-based ligand involving two naphthalenecarboxylate groups was first synthesized, and successfully employed to fabricate a fluorescent metal–organic framework 1 under solvothermal conditions. According to the single-crystal X-ray analysis of compound 1, the Cd(II) ions connected by organic ligands form a 2D layer structure with a unique metallacycle building unit, and adjacent 2D layers are further stacked into a 3D porous framework via numerous supramolecular interactions. Powder X-ray diffraction revealed that 1 exhibits exceptional stability in both water and common organic solvents. The fluorescence sensing experiments conducted with compound 1 toward anions and antibiotics, demonstrated its selective detection capabilities for CrVI anions (CrO42−/Cr2O72−) and nitrofuran antibiotics in aqueous solutions. Additionally, fluorescent 1 serves as an effective fluorescent probe for sensing nitro-aromatic compounds in dimethyl sulfoxide. Its robust anti-interference properties, recyclability, and resistance to water make compound 1 a promising candidate for pollutant detection in wastewater.

Unraveling the transport and compressibility behaviour of copper nitrates in non-aqueous solvents at 308 K temperature and 1 atmospheric pressure

In the present studies, density (ρ), viscosity (η), conductance and ultrasonic velocity (u) of copper (I) nitrate complexes were measured by conventional methods. The data was used to evaluate the transport and compressibility properties of the prepared compounds in Dimethylsulfoxide (DMSO), Pyridine (Py) and Nitromethane (NM) and in their binary mixtures: DMSO + Py and DMSO + NM at different concentrations at 308 K and 1 atmospheric pressure. The experimentally measured data was used to evaluate parameters like Limiting ionic molar conductance (λ⁰i), solvated radii (ri), ionic mobility (μ±), transport number(t±), Ionic B values (B±), Isentropic Compressibility (κs), Limiting molal ionic isentropic compressibility (κso,ø), limiting apparent molar volume (ɸ°v), Masson's coefficient (Sv), partial molar expansibilities (ɸ°E) and Hepler's constant. Trend in the transport behaviour of complexes like conductance and viscosity was discussed in terms of solvated radii and Jones Dole equation for B- coefficients respectively. Similarly, the compressibility behaviour was discussed in terms of trend in the values of limiting molal ionic isentropic compressibility's. The results were interpreted in terms of solute–solute/solute–solvent interaction and structure making/breaking characteristics of solute in the non-aqueous solution.

Synthesis, characterization, and biological activity of novel 3d metal coordination compounds with 2‐acetylpyridine N4‐allyl‐S‐methylisothiosemicarbazone

New zinc(II), copper(II), nickel(II), iron(III), and cobalt(III) coordination compounds, [Zn(HL)I2] (1), [Cu(HL)Cl2] (2), [Cu(HL)Br2] (3), {[Cu(HL)NO3]NO3}n (4), [Ni(HL)2](NO3)2 (5), [Fe(L)2]NO3(6), [Co(L)2]NO3 (7), and [Co(L)2]Cl·H2O (8), were obtained with 2‐acetylpyridine N4‐allyl‐S‐methylisothiosemicarbazone (HL). The isothiosemicarbazone proligand was characterized by nuclear magnetic resonance (NMR) (1H and 13C), infrared (IR) spectroscopy, and X‐ray diffraction. All the coordination compounds were characterized by elemental analysis, IR, UV–Vis spectroscopy, molar conductivity, and magnetic susceptibility measurements. Single‐crystal X‐ray diffraction analysis elucidated the structure of the cationic form of the proligand in the salt [H2L]I and compounds 1–4 and 8 and demonstrated an unusual way of coordination through methylated sulfur atom in 1 and 3. Nevertheless, the electron paramagnetic resonance (EPR) and UV–Vis investigations showed that this way of coordination quickly changes upon dissolution of coordination compounds in dimethyl sulfoxide (DMSO). The antiproliferative properties of these compounds towards human cervical epithelial HeLa, human epithelial pancreatic adenocarcinoma BxPC‐3, human muscle rhabdomyosarcoma spindle, large multinucleated RD cancer cell lines, and normal kidney epithelial MDCK cell line have been investigated. Copper coordination compounds (2–4) show promising anticancer activity with high selectivity (selectivity index [SI] = 10–18) towards BxPC‐3 cell line. They also possess significant antibacterial and antifungal activity, which is useful for cancer treatment.

Molecular Tetrahedrons as Selective and Efficient Ion Transporters via a Two-Station Swing-Relay Mechanism

The traditional approach to utilizing an ion-relay mechanism for ion transport requires three or more ion-relay stations. Herein, we describe a novel strategy, incorporating a swing action to reali...

SYNTHESIS AND STUDY OF SPECTRAL PROPERTIES OF AMINO ACIDS – BODIPY CONJUGATES

The present work describes direct one-pot synthesis of the two novel amino acids – boron-dipyrromethene (BODIPY) conjugates with histidine and tyrosine residues bound to fluorophore via amino group. The synthesized compounds were fully characterized by means of 1H and 11B nuclear magnetic resonance spectroscopy, infrared spectroscopy, time-of-flight mass spectrometry with matrix-activated laser desorption / ionization. All the data are in accordance with the proposed structures. The amino acids – BODIPY conjugates under study were investigated by means of absorbance and fluorescence spectroscopy. Absorption and emission spectra of the compounds in dimethyl sulfoxide (DMSO) – buffer solution (BS) mixture (1:1) were obtained. Moreover, a number of photophysical characteristics of the conjugates, namely: relative fluorescence quantum yield, molar extinction coefficient, relative fluorescence lifetime, radiative and non-radiative rate constants were calulated. 3D fluorescence spectra of the compounds in DMSO – BS mixture (1:1) were obtained. Absorption and emission titration of the compounds was carried out. The results of the titration allowed us to confirm additionally a stoichiometric composition of the conjugates. Quantum chemical analysis of structural and spectral properties of the compounds in a ground state was carried out. The results of quantum chemical calculations gave an insight to a nature of the BODIPY – amino acid interactions in the conjugates. Besides, the synthesized amino acids – BODIPY conjugates are found to be highly soluble in polar solvents. Thus, a range of unique properties of the objects of the present research enables us to use them for visualization of bioactive macromolecules as well as biochemical processes in living cells.

A 15-Month Survey of Dimethylsulfoniopropionate and Dimethylsulfoxide Content in Posidonia oceanica

Posidonia oceanica is the only reported seagrass to produce significant amount of dimethylsulfoniopropionate (DMSP). It is also the largest known producer of DMSP among coastal and inter-tidal higher plants. Here we studied i) the weekly to seasonal variability and the depth variability of DMSP and its related compound dimethylsulfoxide (DMSO) in P. oceanica leaves of a non-disturbed meadow in Corsica, France, ii) the weekly to seasonal variability and the depth variability of DMSP to DMSO concentration to assess the potential of the DMSP:DMSO ratio as indicator of stress, and iii) the relationships between DMSP, DMSO and the DMSP:DMSO ratio with potential explanatory variables such as light, temperature, photosynthetic activity (effective quantum yield of photosystem II) and leaf size. The overall average concentrations of organosulfured compounds in P. oceanica leaves were 130 ± 39 μmol.gfw-1 for DMSP and 4.9 ± 2.1 μmol.gfw-1 for DMSO. Concentrations of DMSP and DMSO in P. oceanica leaves were overall distinctly higher and exhibited a wider range of variations than other marine primary producers. Concentrations decreased from a maximum in autumn to a minimum in summer; they changed little with depth. Potential explanatory variables except the leaf size, i.e., the leaf age were little or not related to measured concentrations. To explain the seasonal pattern of decreasing concentrations with leaf aging, we hypothesized two putative protection functions of DMSP in young leaves: antioxidant against reactive oxygen species and predator-deterrent. The similar variation of the two molecule concentrations over time and with depth suggested that DMSO content in P. oceanica leaves results from oxidation of DMSP. The DMSP:DMSO ratio remained constant around a mean value of 29.2 ± 9.0 µmol:µmol for the non-disturbed harvested meadow regardless of the time of the year, the depth or the leaf size. As suggested for the salt march plant S. alterniflora, we hypothesized the DMSP:DMSO ratio could be considered as indicator of stress in seagrasses exposed to environmental or anthropogenic stressors. More research would now be needed to confirm the functions of DMSP and DMSO in seagrasses and how the DMSP:DMSO ratio will vary under various disturbances.

СПЕКТОРОФОТОМЕТРИЧНІ ТА ПРОТОЛІТИЧНІ ВЛАСТИВОСТІ КОНДЕНСОВАНИХ ЦІАНОПІРИДИНІВ

Development of new optical probes is a promising trend that has been actively implemented in recent years. A rational design of the probes should consider a number of parameters that contribute to the ability of the probe to exhibit highly selective optical response to the analyte. The obvious criteria are the chemical stability and reactivity of the probe, its photostability and the possibility of its reusable application. In this work, new probes based on fused benzothiazoles with different heterocyclic substituents were studied. The spectrophotometric characteristics of compounds in dimethylsulfoxide, acetonitrile and ethanol solutions were obtained. The probes exhibited the absorption in the near UV region and the blue part of the visible spectrum. Absorption spectra of the molecules are characterized by broad band with absorption maximum around 391–400 nm. The selected compounds demonstrated a slight positive solvatochromism. The blue shift of absorption maxima is due to the formation of protonated form of the probe in the presence of hydrochloric acid. Further, in basic conditions, the absorbance maxima of the probes are localized at longer wavelength (Δλ around 80 nm). Reversibility of compounds in the reactions of deprotonation-protonation was studied. Formal protonation constants of compounds (lgKpf) in water-organic solutions were calculated using the UV-Vis spectrophotometry titration method. Protonation constants of probes are in the range: lgKpf = 2.67–4.95. The obtained values of the protonation constants are in good agreement with the data calculated using the software ACD Labs. The presence of the amidine fragment in the structure of the chromophore core leads to an increase in its basicity, with respect to heterocyclic substituents. It was shown that the presence of a substituent more basic than benzothiazole leads to the destruction of the probe in solution with a pH 11. It occurs due to the opening of the iminopyridine cycle into its synthetic precursor. Based on the results, 2-(1,3-benzothiazol-2-yl)-3-(3-hydroxypropyl)-1-imino-1H-pyrido[2,1-b][1,3]benzothiazole-4-carbonitrile was selected for further use as sensitive pH probe.

Electroreduction Ability of Organoborohydride Compounds

Sodium borohydride (BH, NaBH4) has wide application as a reducing agent in organic and inorganic synthesis. Herein, sodium benzylborohydride (BBH, NaC7H7BH3), sodium phenylborohydride (PBH, NaC6H5BH3) and sodium 4-chlorophenylborohydride (CPBH, NaC6H4BH3Cl) are synthesized with high purity, as confirmed by NMR and FTIR. A direct relationship between the organic substituents and the reducing power of the borohydride center is investigated by electrochemical methods. Gold (Au) and platinum (Pt) disk electrodes are used to study the electrooxidation of these organoborohydride (OGB) compounds in dimethyl sulfoxide. Linear scan voltammetry and chronoamperometry measurements are carried out in 0.001–0.01 M solutions of each OGB at temperatures ranging from 25 to 65°C. The results are directly compared to those obtained with BH solutions in the same conditions. A Pt microelectrode is used to perform diffusion coefficient measurements, whose values range from 9.10 × 10−8 cm2 s−1 for CPBH to 2.87 × 10−7 cm2 s−1 for BH. The number of exchanged electrons range between 1.6 for CPBH to 6.6 to BH and charge transfer coefficients are ca. 0.9–1.0. First order reactions are evaluated for the electrooxidation of the four studied borohydride compounds and the corresponding apparent activation energies range between 15 and 33 kJ mol−1.

Water soluble quarternizable gallium and indium phthalocyanines bearing quinoline 5-sulfonic acid: Synthesis, aggregation, photophysical and electrochemical studies

Abstract In this work, we have presented the synthesis, characterization, photophysical properties and electrochemical characterization of new tetra α and β-substituted indium and gallium phthalocyanines MPcX(α- or β-HQSA) 4 {M = Ga(III) ( 3 ) ( 4 ) and In(III) ( 5 ) ( 6 ); X = Cl} attached with 1-hydroxy quinoline-5-sulfonic acid groups on non-periphery and their water-soluble quaternized counterpart. The non-periphery substituted phthalocyanines with axially counter chlorine anion exhibit high solubility and low aggregation tendency owing to bulky HQSA steric hindrance moieties. The novel phthalocyanine precursors, 3, 4, 5, 6 synthesis, characterization, photochemical properties (singlet oxygen quantum yields and photodegradation quantum yields) and photophysical properties (fluorescence quantum yields and flouresans behavior) of their peripherally tetra substituted gallium and indium phthalocyanines are reported in this study. The new compounds ( 3, 4, 5, 6 ) have been characterized by using spectroscopic methods, FT-IR, 1 H NMR spectroscopy, electronic spectroscopy and Maldi-TOF spectra in addition to elemental analysis. General trends focus on fluorescence, photodegradation and singlet oxygen quantum yields of these compounds in dimethylsulfoxide (DMSO), water (H 2 O). The nature of the substituent and solvent effect on the photophysical and photochemical parameters of the substituted phthalocyanines ( 3, 4, 5, 6 ) are also reported. The effect of point of substitution on the electrochemical properties of newly synthesized phthalocyanine compounds, periphery (β-) and non-periphery (α-) substituted with 8-hydroxyquinoline-5-sulfonic acid group were evaluated.

Amine permeation sources characterized with acid neutralization and sensitivities of an amine mass spectrometer

Abstract. An acid titration method for quantifying amine permeation rates was used to calibrate an Ambient pressure Proton transfer Mass Spectrometer (AmPMS) that monitors ambient amine compounds. The method involves capturing amines entrained in a N2 flow by bubbling it through an acidified solution (~10−5 M HCl), and the amines are quantified via changes in solution pH with time. Home-made permeation tubes had permeation rates (typically tens of pmol s−1) that depended on the type of amine and tubing and on temperature. Calibrations of AmPMS yielded sensitivities for ammonia, methylamine, dimethylamine, and trimethylamine that are close to the sensitivity assuming a gas-kinetic, ion-molecule rate coefficient. The permeation tubes were also designed to deliver a reproducible amount of amine to a flow reactor where nucleation with sulfuric acid was studied. The high proton affinity compound dimethyl sulfoxide (DMSO), linked to oceanic environments, was also studied and AmPMS is highly sensitive to it. AmPMS was deployed recently in two field campaigns and, using these sensitivities, mixing ratios for ammonia and the alkyl amines are derived from the signals. Correlations between these species and with particle formation events are discussed.

Interaction between Kaolin and DMSO: FTIR, XRD , thermodynamic and Nano studies

Intercalation of highly polar organic compound dimethylsulfoxide (DMSO) with kaolinite and the formation of interlamellar complexes has been studied, and characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR). Interaction was found to be dependent on the particle size of kaolin raw material. Nature of interaction achieved through the formation of hydrogen bonds between DMSO and both AlOH and Si – O surface of kaolinite. Effect of temperature on equilibrium adsorption of methylene blue (MB) from aqueous solution using kaolin and kaolin – DMSO complexes also studied, the results were analyzed by Langmuir and Freundlich isotherms. Thermodynamic parameters such as ΔG, ΔH and ΔS were calculated. Results suggested that the MB adsorption on kaolin was spontaneous and exothermic process.

Photophysical, Photochemical, and BQ Quenching Properties of Zinc Phthalocyanines with Fused or Interrupted Extended Conjugation

The effects of substituents and solvents on the photophysical and photochemical parameters of zinc(II) phthalocyanines containing four Schiff’s base substituents attached directly and through phenyleneoxy-bridges on peripheral positions are reported. The group effects on peripheral position and the continual and intermittent conjugation of the phthalocyanine molecules on the photophysical and photochemical properties are also investigated. General trends are described for photodegradation, singlet oxygen, and fluorescence quantum yields of these compounds in dimethylsulfoxide (DMSO), dimethylformamide (DMF), and tetrahydrofurane (THF). Among the different substituents, phthalocyanines with cinnamaldimine moieties (1cand2c) have the highest singlet oxygen quantum yields (ΦΔ) and those with nitro groups (1aand2a) have the highest fluorescence quantum yields in all the solvents used. The fluorescence of the substituted zinc(II) phthalocyanine complexes is effectively quenched by 1,4-benzoquinone (BQ) in these solvents.

Novel highly soluble fluoro, chloro, bromo-phenoxy-phenoxy substituted zinc phthalocyanines; synthesis, characterization and photophysicochemical properties

The three new phthalocyanine precursors, 4-[4-(bromo phenoxy)phenoxy]phthalonitrile, 4-[4-(chlorophenoxy)phenoxy]phthalonitrile, 4-[4-(flourophenoxy)phenoxy]phthalonitrile (1, 2 and 3) were synthesized and characterized. The photochemical properties (singlet oxygen quantum yields and photodegradation quantum yields) and photophysical properties (fluorescence quantum yields and fluorescence behavior) of their peripherally tetra substituted zinc phthalocyanines (4)-tetra[bromo phenoxy]phthalocyaninato zinc(II), (4)-tetra[chlorophenoxy]phthalocyaninato zinc(II), (4)-Tetra [flourophenoxy]phthalocyaninato zinc(II) (4, 5 and 6) were reported for the first time. The new compounds (1–6) were characterized by using spectroscopic methods, FT-IR, 1H NMR spectroscopy, electronic spectroscopy and mass spectra as well as elemental analysis. General trends focus on fluorescence, photodegradation and singlet oxygen quantum yields of these compounds in dimethylsulfoxide (DMSO), dimethylformamide (DMF) and tetrahydrofuran (THF). The nature of the substituent and solvent effects on the photophysical and photochemical parameters of the chloro, fluoro, bromo-phenoxy-phenoxy substituted phthalocyanines (4, 5 and 6) was also reported.

Synthesis, spectral and photophysical investigation of porphyrazines with eight 3-quinolinecarboxy esters

In this study, the syntheses and characterization of [2,3,7,8,12,13,17,18-octakis [2′-(3-quinolincarboxy)ethylhio] porphyrazinato N21N22N23N24] magnesium(II), quaternized [2,3,7,8,12,13,17,18-octakis [2′-(3-quinolincarboxy)ethylhio] porpyrazinato N21N22N23N24] magnesium(II), [2,3,7,8,12,13,17,18-octakis[2′-(3-quinolinecarboxy)-ethylthio]21H23H N21N22N23N24 porphyrazine and [2,3,7,8,12,13,17,18-octakis[2′-(3-quinolinecarboxy)-ethylthio]porphyrazinato N21N22N23N24} zinc are described. The new compounds have been characterized by elemental analysis, FT-IR, 1H-NMR, and mass spectra. General trends are described for fluorescence quantum yields of these compounds in dimethylsulfoxide (DMSO). In this study, the effects quaternization of the substituents on the photophysical and spectroscopic properties are also reported.

Thermodynamic properties of biologically active substances: 3-acetyl-9-methoxy-2-phenyl-11H-indolizino[8,7-b]indole and 8-acetylharmine

The enthalpies of solution of 3-acetyl-9-methoxy-2-phenyl-11H-indolizino[8,7-b]indole and 8-acetylharmine in dimethyl sulfoxide were measured by isothermal calorimetry at solute: solvent molar ratios of 1: 9000, 1: 18000, and 1: 36000. From the data obtained, the standard enthalpies of solution of the compounds in dimethyl sulfoxide at infinite dilution were calculated. The heat capacities of 8-acetylharmine were determined by dynamic calorimetry in the interval 298.15–673 K, and the C p o = f(T) equations were obtained. The standard enthalpies of combustion of the compounds were estimated by approximate methods, and their heats of melting were calculated. From the data obtained, using Hess cycle, the standard enthalpies of formation of the compounds were calculated.

Synthesis, electrochemistry and fluorescence behavior of thiophene derivatives decorated with coumarin, pyrene and naphthalene moieties

A novel series of functionalized thiophenes incorporating coumarin, pyrene and naphthalene pendants were synthesized by Steglich esterification in the presence of DCC/DMAP (dicyclohexylcarbodiimide/N,N-dimethylaminopyridine) and the synthesized monomers were electrochemically deposited onto glassy carbon and carbon fiber micro electrodes as active electrode materials. The synthesized thiophene derivatives were characterized by 1H NMR, 13C NMR, FTIR, cyclic voltammetry, electrochemical impedance spectroscopy and electronic absorption as well as fluorescence spectroscopy. An electrochemical impedance study was performed on the surface modified electrodes. Variation of capacitance values was explained according to the different fluorophore groups attached to the thiophene as well as the different substrates. The fluorescence properties of the three compounds in dimethylsulfoxide were measured, with varying effects of the thiophene moiety on the fluorescence emission. The morphology of the monomers was monitored using SEM.

A Practical Synthesis and Applications of (E)-Diphenyl-β-(trifluoromethyl)vinylsulfonium Triflate

( E )-Diphenyl-β-(trifluoromethyl)vinylsulfonium triflate, readily prepared from 2-bromo-3,3,3-trifluoroprop-1-ene in two steps, undergoes double alkylation with active methylene compounds in dimethyl sulfoxide or ethyl acetate, in an open vessel at room temperature, to provide the corresponding trifluoromethylated cyclopropane derivatives in excellent yields. The cyclopropane, ethyl 1-cyano-2-(trifluoromethyl)cyclopropanecarboxylate is subjected to a ring-opening reaction followed by cyclization to afford a trifluoromethylated dihydroaminothiophene, which on oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone furnishes the corresponding trifluoromethylated aminothiophene in a high 88% yield.

Peripheral octa-substituted metal-free, cobalt(II) and zinc(II) phthalocyanines bearing coumarin and chloro groups: Synthesis, characterization, spectral and electrochemical properties

Novel octa-substituted metal-free, cobalt(II) and zinc(II) phthalocyanines have been synthesized by using chloro and/or coumarin substituted phthalonitrile derivatives. The compounds were characterized by UV–Vis, IR, 1H NMR, and MALDI-TOF mass spectrometry and elemental analysis. The effects of substituents, metals, solvents and concentration on spectroscopic properties and aggregation behaviour of the novel Pcs were investigated. Furthermore, the redox properties of the octa-4-(4-methoxyphenyl)-7-oxo-8-methylcoumarin-substituted compounds were examined in dimethylsulfoxide and dichloromethane by voltammetry and in situ spectroelectrochemistry. Metal-free phthalocyanine and zinc phthalocyanine displayed ligand-based one-electron redox processes whereas cobalt phthalocyanine showed both ligand- and metal-based processes. A couple corresponding to the reduction of 4-(4-methoxyphenyl)-7-oxo-8-methylcoumarin substituents was also detected. The redox processes of the compounds in dimethylsulfoxide were observed to be broad or split, due to the association of electron transfer processes by aggregation–deaggregation equilibrium.

Synthesis, spectral and photophysical properties of novel phthalocyanines bearing bulky phenantroxy moiety

The synthesis, characterization, spectral and photophysical properties of soluble 9-Phenanthroxy substituted oxo-titanium (IV), zinc, magnesium and nickel phthalocyanines (1a, 1b, 1c and 1d) are reported for the first time. The new compounds have been characterized by elemental analysis, FT-IR, 1H–NMR spectroscopy, electronic spectroscopy and mass spectra. General trends are described for spectral, fluorescence properties and fluorescence quantum yields of these compounds in dimethylsulfoxide (DMSO) and toluene. All phthalocyanine complexes (1a to 1d) exhibited excellent solubility in organic solvents such as dichloromethane, chloroform, THF, toluene, DMF and DMSO.

A novel phthalocyanine conjugated with four salicylideneimino complexes: Photophysics and fluorescence quenching studies

A novel phthalocyanine with four salicylideneimino ligating groups directly conjugated to the macrocyclic core has been synthesized by the condensation of tetramino-phthalocyanine with salicylaldehyde. Complexation on the periphery to obtain pentanuclear complex has been accomplished either directly through the reaction of this phthalocyanine, 8-hydroxyquinoline as the second ON donor ligand and zinc (II) salt or zinc (II) complex of 8-hydroxyquinoline has been isolated first and then it has been reacted with the phthalocyanine carrying salicylideneimino ligating groups. Also a new mixed ligand Schiff base complex of Zn (II) as a model containing salicylaldimine ligand and 8-hydroxyquinoline has been synthesized to compare with the complex. The new compounds have been characterized by elemental analysis FTIR, 1H NMR, UV–Vis spectroscopy and mass spectrometry. General trends are described for fluorescence lifetimes and fluorescence of these compounds in dimethylsulfoxide, dimethylformamide and tetrahydrofurane. The solvent effect on the photophysical parameters of the zinc (II) phthalocyanines and the model zinc (II) complex is also studied. The fluorescence of the substituted zinc (II) phthalocyanine complexes is effectively quenched by 1,4-benzoquinone (BQ) in these solvents.