Author
V.B. Rana
Bio: V.B. Rana is an academic researcher from Meerut College. The author has contributed to research in topics: Acetylacetone & Cobalt. The author has an hindex of 16, co-authored 31 publications receiving 630 citations.
Papers
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70 citations
TL;DR: In this article, the distortion of the 16-membered N6 tetradentate macrocyclic ligand is calculated in terms of DT/DQ by applying NSH theory.
Abstract: Trivalent chromium, manganese, iron and cobalt salts reactin situ with 2,6-diaminopyridine and acetylacetone to form complexes of the 16-membered N6 tetradentate macrocyclic ligand. The chelates are characterised as distorted square-pyramidal of [M(TML)X] type, where M = chromium(III), manganese(III), iron(III) and cobalt(III); X=Cl, Br, NO3 or NCS for chromium(III) and iron(III) and X=(OAc) for manganese(III) and (OH) for cobalt(III). The ligand coordinates through all the nitrogen atoms through deprotonation of two of them, however, the pyridine nitrogens do not take part in coordination. The chelates incorporate one anion or hydroxyl group in the coordination sphere. The magnetic, electronic and i.r. spectral studies indicate lower symmetries for these chelates. The amount of distortion is calculated in terms of DT/DQ by applying NSH theory. X-ray measurements on powder form of the complexes show their isomorphic nature and also support the proposed structures.
61 citations
TL;DR: In this paper, a 16-membered N6 tetradentate macrocyclic ligand is characterized as distorted octahedra of the M(TML)X2 type.
Abstract: Divalent nickel, cobalt and copper salts react with 2,6-diaminopyridine and acetylacetone to form complexes containing a 16-membered N6 tetradentate macrocyclic ligand. The complexes are characterised as distorted octahedra of the M(TML)X2 type where M=nickel(II), cobalt(II) and copper(II); TML=tetradentate macrocyclic ligand and X=Cl, Br, NO3 or NCS. The ligand coordinates through all the four azomethine nitrogen atoms which are bridged by acetylacetone moieties. Pyridine nitrogen does not participate in coordination, a fact supported by far i.r. studies. The magnetic, electronic and i.r. spectral studies indicate that the complexes have lower symmetries and the amounts of distortion calculated in terms of DT/DQ applying normalised spherical harmonic Hamiltonian theory indicate that these complexes are moderately distored.
46 citations
TL;DR: In this paper, orthohydroxyacetophenone-picolinoylhydrazone (APH) and Orthohydroxy-acetphenone-isonicotinoly hydrazone(AIH) react with divalent nickel and cobalt salts in methanolic medium and give complexes of the type [MAPH)X]2 and [M( AIH)X], where M�Ni(II) and Co(II), XCl, Br, NO3, NCS or H2O, depending upon the pH of the
45 citations
TL;DR: In this article, metaphenylenediamine and acetylacetone react in presence of divalent nickel, cobalt and copper salts to form complexes of a 16-membered N4 tetradentate macrocycle.
44 citations
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TL;DR: Thermal studies suggest a mechanism for degradation of the metal complexes as function of temperature supporting the chelation modes and show the possibility of obtaining new complexes pyrolytically in the solid state which cannot be synthesized from solution.
157 citations
TL;DR: A brief account of the methods generally employed for the synthesis of metal alkoxides has been presented in this article, followed by an extension of the work to a novel series of ter- and tetra-metallic alkoxide during the last two years.
Abstract: A brief account of the methods generally employed for the synthesis of metal alkoxides has been presented. Successful elucidation of the structural features of simple alkoxides on the basis of a coordination model involving alkoxy bridges has prompted a detailed study of a variety of bimetallic alkoxides during the last two decades followed by the extension of the work to a novel series of ter- and tetra-metallic alkoxides during the last two years. Most of these polymetallic alkoxides (including derivatives of strongly electropositive alkali, alkaline earth metals and lanthanons) are stable to heat and can be volatilized unchanged. After listing the typical properties and reactions of these alkoxy derivatives, their hydrolytic reactions are briefly discussed. The uses of metallic alkoxides for ceramic materials and the potential applications of bimetallic alkoxides in this direction are discussed.
156 citations
TL;DR: Copper(II) complexes of the antitumour ligand salicylaldehyde benzoylhydrazone (H2sb) have been prepared in the presence of strong acids.
155 citations
TL;DR: The study showed that ZnII complex showed potent inhibition against human TRK in the four cell lines (HepG2, MCF7, A549, HCT116) by the ratio 80, 70, 61 and 64% respectively as compared to the inhibition in the untreated cells.
108 citations
TL;DR: In this paper, a new series of complexes is synthesized by template condensation of glyoxal and oxalyldihydrazide in methanolic medium in the presence of divalent cobalt, nickel, copper, zinc and cadmium salts.
Abstract: A new series of complexes is synthesized by template condensation of glyoxal and oxalyldihydrazide in methanolic medium in the presence of divalent cobalt, nickel, copper, zinc and cadmium salts forming complexes of the type: [M(C8H8N8O4)X2] where M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and X = Cl−1, Br−1, NO
3
−1
, OAc−1. The complexes have been characterized with the help of elemental analyses, conductance measurements, magnetic susceptibility measurements, electronic, n.m.r., infrared and far infrared spectral studies. On the basis of these studies, a six coordinate octahedral geometry for these complexes has been proposed. The biological activities of the metal complexes have been tested in vitro against a number of pathogenic bacteria to assess their inhibiting potential. Most of the compounds have been found to exhibit remarkable antibacterial activities.
105 citations