Magnetism, A Treatise on Modern Theory and Materials. Volume III. By George T. Rado and Harry Suhl

Figgis, Brian N.

doi:10.1021/ic50018a038

Cited by 55 publications

(66 citation statements)

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“…which corresponds to two unpaired spins anticipated for the octahedral geometry [10]. The higher value of magnetic m om ent as com pared to the spin only value of 2.83 B.M.…”

Section: Magnetic Studiesmentioning

confidence: 96%

Bimetallic Alkoxides of Nickel(II) with Niobium(V) and Tantalum(V)

Jain

Mehrotra

1985

Zeitschrift Für Naturforschung B

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A new class of bimetallic isopropoxides of nickel(II) with niobium and tantalum with the general formula, Ni[M(OPri)6]2, (where M = Nb or Ta) have been synthesized by the reaction of nickel chloride isopropanolate, NiCl2·ϰPriOH, with potassium hexaisopropoxy metalates, KM(OPri)6, (M = Nb or Ta) in the molar ratio 1:2. These derivatives have been characterized by elemental analyses, molecular weight determinations, infrared and visible reflectance spectroscopy in addition to magnetic susceptibility measurements. Alcohol interchange reactions of these bimetallic alkoxides have also been studied. On the basis of above studies, an octahedral geometry has been assigned to Ni(II) in primary bimetallic alkoxides while in secondary derivatives, it appears that there exists an equilibrium between octahedral and tetrahedral forms.

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“…which corresponds to two unpaired spins anticipated for the octahedral geometry [10]. The higher value of magnetic m om ent as com pared to the spin only value of 2.83 B.M.…”

Section: Magnetic Studiesmentioning

confidence: 96%

Bimetallic Alkoxides of Nickel(II) with Niobium(V) and Tantalum(V)

Jain

Mehrotra

1985

Zeitschrift Für Naturforschung B

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“…The susceptibility of Hg[Co(SCN) 4 ] was taken as 16.44ϫ10 6 centigrams units at 20°C using standard procedure. 31) Circular dichroism spectra of optically active complexes were recorded on Jasco 20A spectropolarimeter, equipped with xenon source and a recorder.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Characterization and Hypoglycemic Activity of Zn(II), Cd(II) and Hg(II) Complexes with Glibenclamide

Rasheed

Tariq

Munir

et al. 2008

CHEMICAL & PHARMACEUTICAL BULLETIN

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Inorganic elements play crucial roles in biological and biomedical processes, and it is evident that many organic compounds used in medicine do not have a purely organic mode of action; some are activated or biotransformed by metal ions including metalloenzymes, others have a direct or indirect effect on metal ion metabolism.1,2) Metals like chromium, zinc, vanadium, copper, selenium, etc., have been reported in lowering the blood sugar level (Hypoglycemia). At the molecular and cellular level, zinc is intimately involved in insulin synthesis, secretion and signalling, and thus, the consequent actions of insulin on metabolism.3,4) In addition to antiviral, antibacterial, antifungal and anticancer properties, 5) various clinical and epidemiological studies suggest that reduced Zn status is associated with diabetes.3,4,6,7) Moreover, zinc is known to be essential for the function and/or structure of several enzymes e.g.; dehydrogenases, aldolases, peptidases, phosphatases, an isomerase, a transphosphorylase, aspartate transcarbamylase, pancreatic carboxpeptidase, and tryptophan desmolase. 8) Zinc-dependent metalloenzymes are also found among oxidoreductases, transferases, hydrolases, lyases, isomerases and ligases. 9)Sulfonylureas have received much attention because of their pharmacological activities in the treatment of non-insuline dependent diabetes mellitus (NIDDM) to enhance the sensitivity of tissues to insulin and to stimulate the pancreas to secrete more insulin and comprise the largest group of oral hypoglycemic agents. These are structurally dissimilar, differing primarily with respect to the substituent R at para position of the benzene ring and the group attached to the terminal urea nitrogen RЈ (1). Inspite of side effects like hypoglycemia, central nervous system problems and skin reactions, [10][11][12] glibenclamide, a second generation sulfonylurea drug, is being used widely due to its safe administration with other drugs, low production of diuresis, no significant antidiuretic effect, no or low disulfiran like reaction as well as dual route of excretion without effecting glucose tolerance. [13][14][15][16] It is found that complexes of some active drugs are more effective than the ligand themselves. [17][18][19][20][21] It is the reason that transition metal complexes of established drugs are gaining much biological significance. [22][23][24] The chemistry of sulphonylureas and their metal complexes have created great interest and enthusiasm among the chemists because of their pharmacological importance. Some studies on the coordination chemistry of sulphonylurea drug with Zn 2ϩ , Cd 2ϩ and Hg 2ϩ metals ions have been carried out which is an attempt to examine the mode of action and drug delivery. 25,26) Keeping in view the concept of coordination of suitable metals as central atom, the biologically active compounds often become more effective than desirable drugs. 27) Hence, the objective of this study was to synthesize a metal based drug after long term clinical studies establishing safety (la...

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“…The room temperature magnetic moments and details of the polycrystalline ESR spectra of the studied copper(II) complexes are listed in Table 6. The observed magnetic moments of the investigated copper(II) complexes lie in the 1.95 -2.12 BM range, corresponding to one unpaired electron [35,36] and in consistence with the mononuclear monomeric structure of these complexes. Based on these normal magnetic moment values, there seems to be no exchange interaction between the copper(II) ions in the solid state of these copper(II) chelates.…”

Section: Ir Spectral Studies:-mentioning

confidence: 99%

“…ESR spectra and magnetic moment measurements:-As further structural characterization tools, the magnetic moment measurements and the ESR spectra studies have been used to confirm the geometry of the reported copper(II) complexes. Copper (II) ion belongs to the 3d 9 and S = 1/2 system [35,36]. The room temperature magnetic moments and details of the polycrystalline ESR spectra of the studied copper(II) complexes are listed in Table 6.…”

Section: Ir Spectral Studies:-mentioning

confidence: 99%

Synthesis and Characterization of N3s2 Donors Macrocyclic Copper(ii) Complexes. Catechol Oxidase and Phenoxazinone Synthase Biomimetic Catalytic Activity.

Ramadan¹,

Shaban²,

Khalil³

et al. 2017

IJAR

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A new series of hexa-, and five-coordinated copper(II) complexes, having the molecular formulae of [CuLX]X H 2 O, 1, 2, 3 (X = Cl¯, Br¯, NO 3¯) and [CuL]X 2 nH 2 O, 4, 5 (X= AcO¯ and ClO 4¯) respectively and L is pentadentate pyridine based ligand have been synthesized. Structural characterization of these newly synthesized compounds was achieved by several physicochemical methods including elemental and thermal analysis (TGA and DTG), electrical molar conductance, magnetic moment measurements and spectral investigations such as IR, UV-Vis and ESR. The spectral and magnetic measurements in addition to the electrolytic conductance results demonstrated the octahedral and square-pyramidal stereochemistries for the hexa, and five coordinated copper(II) chelates respectively. Catechol oxidase and phenoxazinone synthase biomimetic catalytic activity of the inspected copper(II) chelates was studied and the results obtained indicated that, the catalytic reactivity is markedly depends on the structural properties of these newly synthesized copper(II) complexes. …………………………………………………………………………………………………….... Introduction:-Functional models of the metalloenzymes that activate molecular oxygen possess great potential as catalyst for specific oxidation reactions and as guides for the development of efficient small molecule catalysts [1]. Since, the oxidation of organic substrates with molecular oxygen under mild conditions is of great interest for industrial [2] and synthetic processes both from an economical and environmental [3] point of view, most of the focus of ongoing biomimetic and bioinspired synthetic approaches is on reproducing some structural and/or functional feature of the title enzymes. The synthesis and reactivity studies of transition metal complexes, as functional model compounds for metalloenzymes with oxidase activity, are of particular interest for the development of bioinspired catalysts for oxidation reactions.The potential role played by copper ions in the active sites of a large number of metalloproteins has stimulated efforts to design and characterize copper complexes as models for providing better understanding of biological systems and for assisting in the development of new homogeneous catalysts for selective oxidation. Particularly, the

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Magnetism, A Treatise on Modern Theory and Materials. Volume III. By George T. Rado and Harry Suhl

Cited by 55 publications

References 0 publications

Bimetallic Alkoxides of Nickel(II) with Niobium(V) and Tantalum(V)

Bimetallic Alkoxides of Nickel(II) with Niobium(V) and Tantalum(V)

Synthesis, Characterization and Hypoglycemic Activity of Zn(II), Cd(II) and Hg(II) Complexes with Glibenclamide

Synthesis and Characterization of N3s2 Donors Macrocyclic Copper(ii) Complexes. Catechol Oxidase and Phenoxazinone Synthase Biomimetic Catalytic Activity.

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