Characterization Of Nickel Research Articles

Synthesis and characterization of nickel(II) complexes containing ligands derived from disaccharides and 1,3-diaminopropane

The reaction of [Ni(tn)3]2+ ions (tn = 1,3-diaminopropane) with disaccharides having a glucose reducing terminal, i.e. maltose, lactose, cellobiose, and melibiose, in the presence of a catalytic amount of ammonium chloride gave blue, paramagnetic bis(N-D-aldosylpropane-1,3-diamine)nickel(II) complexes. The complexes were characterized by elemental analysis, magnetic susceptibilities, electronic absorption and circular dichroism spectroscopies, X-ray absorption and crystallographic analyses. The complex bis[N-(4-O-α-D-glucopyranosylglucosyl)propane-1,3-diamine]nickel(II) bromide dihydrate crystallizes in the hexagonal space group P6422, with a= 22.125(8), c= 21.464(9)A, and Z= 6. The structure was solved by Patterson methods and refined by full-matrix least-squares techniques to R= 0.080 and R′= 0.094. The complex cation has C2 symmetry and the central nickel atom is octahedrally co-ordinated by two tridentate glycosylamine ligands formed from maltose and tn. Each ligand is bonded through the oxygen atom of the hydroxyl group at C2 of maltose and through the two nitrogen atoms of the diamine in a meridional mode. The co-ordination behaviour of the glucose unit in the octahedral nickel(II) complexes has been established. In the crystal packing, the complex cation exists in a novel dimeric form supported by intermolecular hydrogen bonds, which might provide some fundamental information concerning sugar–sugar interactions in biological systems.

TEM characterization of nickel and nickel-cobalt manganite ceramics

Abstract Nickel and nickel-cobalt manganites were investigated by transmission electron microscopy (TEM) in order to relate microstructure and phase composition to the electrical stability of these ceramics after ageing. The air-quenched samples are biphased and exhibited a perturbed microstructure with bidimensional lattice defects. It is shown that the improvement in the stability of electrical properties is not due to the existence of a precipitated phase, like NiO, but could be related to the presence of a ‘tweed’ structure, that is, a fine periodic structure built on {110} lamellae (exsolutions). Since the change in the electrical properties could be related to the Mn 3+ cluster migration, it is suggested that the lattice perturbations resulting from the ‘tweed’ could slow down cluster migration and then stabilize the electrical properties of the ceramics studied.

Synthesis and Characterization of Nickel(II) and Palladium(II) Complexes of Novel Tetraaza[14]-Annulene-Tetracarbonitrile

Abstract The nickel(II) and palladium(II) complexes for 6,13-di-n-propyl-l,8-dihydro-1,4,8,11-tetraazacyclotetradeca-2,4,6,9, 11.13-hexaene-2,3,9,10-tetracarbonitrile have been prepared. The mass spectra establish the existence of the parent ion. In view of the C ≡ N stretching mode, the nitrile groups at 2-,3-,9-, and 10-positions are not coordinated to a metal(II). In NMR spectra, the amine proton signal is observed in a much lower field owing to electron-withdrawing effect of the nitrile groups. Judging from d → d∗ transitions, the metal(II) complexes have the square-planar configurations.

Spectroscopic characterization of nickel(II) carboxypeptidase

The electronic and 1H NMR spectra of nickel-substituted carboxypeptidase have been measured and discussed in the light of the available X-ray data. The interaction with D-phenylalanine has been investigated as well as that with azide. It is proposed that D-Phe binds first at a non-metallic site, probably Arg-145, and then to the metal. The behaviour of L-Phe is more complex. Azide binds at the metal in the presence of the amino acid. These results are similar to those obtained for the parent (zinc) and cobalt-substituted enzymes. Implications for the enzymatic mechanism are discussed.

Characterisation of nickel(II) complexes of a substituted 2-acetylpyridine thiosemicarbazone by electronic and n.m.r. spectral studies

NiII complexes of 1H-hexahydroazepine-1-thiocarboxylic acid-2-[1-(2-pyridinyl)ethylidene] hydrazide (HL4A) of general formula [Ni(L4A)X] (X=Cl, Br, I or NCS) have been synthesized and characterised by physical and spectroscopic methods. The molar conductivities show that all of the complexes are non-electrolytes. The terdentate character of the ligand in all cases is inferred from i.r. spectra, while the electronic spectra suggest planar geometries.

Preparation and Characterisation of Nickel(II) and Chromium(III) Complexes with N-Acylamino Acids and their Adducts

Preparation and Characterisation of Nickel(II) and Chromium(III) Complexes with N-Acylamino Acids and their Adducts

Synthesis and characterization of nickel(II) complexes of purine and pyrimidine bases. Crystal and molecular structure of trans-bis(cytosine-O2)bis(ethylenediamine)nickel(II) bis(tetraphenylborate). An unusual metal binding mode of cytosine

Three nucleobase complexes [Ni(en) 2 (Ade)]Cl 2 , [Ni(en) 2 (Hyp)] Cl.0.5CH 3 OH.H 2 O and [Ni(en) 2 (Cyt) 2 ] [B(C 6 H 5 ) 4 ] 2 (en=ethylenediamine; Ade=adenine; Hyp=hypoxanthine; Cyt=cytosine) have prepared by reaction of Ni(en) 2 Cl 2 and the corresponding purine or pyrimidine base in a methanol or an ethanol-water medium. The cytosine complex was obtained in the form of suitable crystals for X-ray crystallography. The complex crystallizes in the monoclinic space group P2 1 /a

Characterization of Nickel and Tungsten species supported on alumina

AbstractThe effect of thermal activation on NiW/Al2O3 catalyst in their oxide, reduced and sulfided forms has been studied by X‐ray diffraction (XRD), differential thermal analysis (DTA), diffusion reflectance spectroscopy (DTS), infrared spectroscopy (IR), Raman spectroscopy (RS), electron paramagnetic resonance (EPR) and magnetic susceptibility measurements.Thermal activation in oxygen results in production of many species of the mono‐, di‐, and polymeric type. Upon activation in hydrogen they are partially reduced, whereas upon sulfiding number of oxide ions are replaced by sulfide ones. Among others, formation of dithiotungstenates was proved, yet neither the exchange of hydroxyl groups for the thiol ones nor the exchange of bridge oxide ions for sulphur ions was indicated.The simultanous reduction and sulfiding process do not affect the spinel subsurface structure. With respect to the surface species, the catalyst's support takes on a stabilizing function.

Preparation and Characterisation of Nickel(II) and Chromium(III) Complexes with N-Acylamino Acids and their Adducts

Preparation and Characterisation of Nickel(II) and Chromium(III) Complexes with N-Acylamino Acids and their Adducts

Comparison of processing characteristics of Mayan and Wilmington heavy residues: 1. Acid-base-neutral fractionation and characterization

Wilmington 538 °C + and Mayan 496 °C + crude oil residues were hydrotreated at four temperature levels. The products from hydrotreating were gases and condensates in the overhead and heavy liquids and, at high temperatures, solids in the reactor. The condensates were analysed for elemental content; g.c. simulated distillation was used to determine their boiling range, and m.s. was used to determine compound types present. The heavy liquids were separated into acid-base-neutral (ABN) fractions by a unique nonaqueous ion exchange technique developed at NIPER. The compositional changes in heavy liquid products caused by hydrotreating were evaluated between crudes and also between chemical classes by comparing yields and elemental analyses (C, H, N, S) of ABN fractions. It was found that the Mayan residue was more inert to hydrotreating than the Wilmington. In both crudes, the strong acid fractions were the most resistant while the Mayan weak acid fraction was more resistant than the Wilmington weak acid fraction. The base fractions were converted to other types more easily than the acid fractions. The characterization of nickel and vanadium complexes in the feed, products and ABN fractions is addressed elsewhere 1.

Characterization of nickel loaded mordenite catalysts by temperature programmed reduction

Temperature programmed reduction (TPR) has been used to study the redox behavior of Ni(II) ions in nickel sodium mordenite (NiNaM) and decationated nickel mordenite (NiHM). The TPR profiles suggest that Ni(II) ions occupy nonequivalent sites with different cooridination states in the mordenite. The reducibility of Ni(II) depends strongly on the zeolite acidity.

Preparation and characterisation of some nickel(II) tetra-aza macrocyclic complexes bearing pendant polymerisable groups as part of the ligand superstructure

The synthesis and characterisation of some new nickel(II) macrocyclic complexes of the ‘lacunar’ type have been performed where the ligand has, as part of the ligand superstructure, either 4-vinylphenyl or allyl groups capable of undergoing polymerisation reactions with selected comonomers. The n.m.r. spectra of a number of these new complexes show them to be fluxional on the n.m.r. time-scale and the nature of this fluxional behaviour is discussed. Some copolymerisation reactions of these complexes, with styrene or methyl methacrylate comonomers, have been performed.

Optical Characterisation of Nickel in Diamond

ABSTRACTOptical absorption and luminescence with zero-phonon lines at 1.401 and 1.404 eV is shown to contain fine structure induced by the isotopes of natural Ni. Uniaxial stress and magnetic field perturbations establish that the optical center has trigonal symmetry. A relationship is estimated between the concentration of Ni in these optical centers and the strength of the optical absorption.

Characterization of nickel(II)-nickel(IV) linear chain compounds by nickel and chlorine K-edge EXAFS

Characterization of nickel(II)-nickel(IV) linear chain compounds by nickel and chlorine K-edge EXAFS

Preparation and characterization of nickel(2+) hexafluorobismuthate(1-) and of the ternary adducts [Ni(CH3CN)6](BiF6)2 and [Ni(CH3CN)6](SbF6)2. Crystal structure of hexakis(acetonitrile-d3)nickel(2+) hexafluoroantimonate

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of nickel(2+) hexafluorobismuthate(1-) and of the ternary adducts [Ni(CH3CN)6](BiF6)2 and [Ni(CH3CN)6](SbF6)2. Crystal structure of hexakis(acetonitrile-d3)nickel(2+) hexafluoroantimonateRoland Bougon, Pierrette Charpin, Karl O. Christe, Jacques Isabey, Monique Lance, Martine Nierlich, Julien Vigner, and William W. WilsonCite this: Inorg. Chem. 1988, 27, 8, 1389–1393Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 April 1988https://doi.org/10.1021/ic00281a018RIGHTS & PERMISSIONSArticle Views193Altmetric-Citations28LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (518 KB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

Transition metal complexes with thiosemicarbazide-based ligands, Part II, Synthesis and characterisation of nickel(II), cobalt(II), manganese(II) and zinc(II) complexes with the pentadentate ligand, 2,6-diacetylpyridine bis(S-methylisothiosemicarbazone)

The reaction of warm alcoholic solutions of acetates of CoII, MnII, ZnII and NiII with 2, 6-diacetylpyridine andS-methylisothiosemicarbazide hydrogen iodide yielded the complexes: [Co(H2L)I2]·H2O, [Mn(H2L)(MeOH)2]I2, [Zn(H2L)(MeOH)I]I and [Ni(HL)]I, (H2L=the pentadentate pentaaza-ligand 2, 6-diacetylpyridine bis(S-methylisothiosemicarbazone)). The reaction of methanolic solutions of [Ni(HL)]I and NH4NCS or LiOAc.2H2O, give [Ni(HL)]NCS and NiL, respectively. For the complexes of CoII, MnII and ZnII, a pentagonal bipyramidal configuration is proposed, with H2L in the equatorial plane and two unidentate ligands (I and/or MeOH) in the axial positions. The complexes [Ni(HL)]X (X=I or NCS) and NiL probably have monomeric five- and dimeric six-coordinate structures, respectively, in which only the chelate ligand is involved in coordination.

Preparation and Characterization of Nickel(II) Complexes with Diethyl N,N′-Ethylenebis(2-hydroxyimino-3-iminobutanoate) and Its Analogue

Abstract The reaction of nickel(II) chloride hexahydrate and ethyl α-(hydroxyimino)acetoacetate with ethylenediamine or (R)-propylenediamine gives [diethyl N,N′-ethyIenebis(2-hydroxyimino-3-iminobutanoato)]nickel(II) or {diethyl N,N′-[(R)-1-methylethylene]bis(2-hydroxyimino-3-iminobutanoato)}nickel(II). The nickel(II) complexes with Schiff base ligands were characterized by their electronic absorption, 13CNMR, infrared, and CD spectra.

Synthesis and characterization of nickel(II), cobalt(II), copper(II), manganese(II), zinc(II), zirconium(IV), dioxouranium(VI) and dioxomolybdenum(VI) complexes of a new Schiff base derived from salicylaldehyde and 5-methylpyrazole-3-carbohydrazide

Synthesis of a new Schiff base derived from salicylaldehyde and 5-methylpyrazole-3-carbohydrazide, and its coordination compounds with nickel(II), cobalt(II), copper(II), manganese(II), zinc(II), zirconium(IV), dioxouranium(VI) and dioxomolybdenum(VI) are described. The ligand and the complexes have been characterized on the basis of analytical, conductance, molecular weight, i.r., electronic and n.m.r. spectra and magnetic susceptibility measurements. The stoichiometries of the complexes are represented as NiL · 3H2O, CoL · 2H2O, CuL, MnL · 2H2O, ZnL · H2O, Zr(OH)2(LH)2, Zr(OH)2L · 2MeOH, UO2L · MeOH and MoO2L · MeOH (where LH2 = Schiff base). The copper(II) complex shows a subnormal magnetic moment due to antiferromagnetic exchange interaction while the nickel(II), cobalt(II) and manganese (II) complexes show normal magnetic moments at room temperature. The i.r. and n.m.r. spectral studies show that the Schiff base behaves as a dibasic and tridentate ligand coordinating through the deprotonated phenolic.oxygen, enolic oxygen and azomethine nitrogen.

Synthesis and Characterization of Nickel (II), Cobalt (II), Copper(II), Manganese (II), Zinc (II), Zirconium (IV), Oxomolybdenum (V), and Dioxouranium (VI) Complexes of the Schiff Base Derived from Salycylaldehyde and Thiophene-2-Carboxylic Acid Hydrazide

Abstract Several new coordination complexes of nickel (II), cobalt (II), copper(II), manganese(II), zinc(II), zirconium (IV), oxomolybdenum (V), and dioxouranium (VI) with the new Schiff base derived from salicylaldehyde and thiophene-2-carboxylic acid hydrazide have been synthesized and characterized by elemental analysis, electrical conductance, molecular weight, oxidimetric titration, electronic and IR spectra, and magnetic susceptibility measurements. The Schiff base behaves as a dibasic, tridentate ligand coordinating through an ONO donor system and forms complexes of the compositions NiL.3H2O, CoL.2H2O,[CuL]2, MnL.2H2O, ZnL.H2O,[Mo OCIL]2, Zr(OH)2 (LH)2, Zr(OH)2L.2CH3OH and UO2L.CH3OH (where LH2 [dbnd] Schiff base). The nickel (II), cobalt (II) and manganese (II) complexes exhibit normal magnetic moments at room temperature while the copper (II) and oxomolybdenum (V) complexes show subnormal magnetic moments with antiferromagnetic exchange interaction. The zinc(II), zirconium(IV), and dioxouranium(V...

Synthesis and Characterization of Nickel (II) Complexes with Imineoximes

Abstract Reactions of NiX2 (X=I, ClO4) with Hdox-enR2 (Ia, R=Me, Et, Bu) yielded complexes of the type Ni (dox-en-R2)X. They consist of binuclear complex ions of the type [Ni2 (dox-enR2)2]2+ and uncoordinated anions. Similar reactions starting from Ni (NCS)2 yielded Ni (HdoxenEt2)2 (NCS)2 and Ni (Hdox-enR)2 (NCS)2. In the solid state they are presumed to consist of six-coordinate uninuclear complexes, in which the two thiocyanate ions are coordinated to the nickel (II) ion through the nitrogen atoms in cis-positions.