Crystallographic characterization of π-[Co(bpy)(dien)Cl]Cl<sub>2</sub>.3H<sub>2</sub>O

Bhat, G. R.; Dubey, K. P.; Segal, Brent M.; Pierpont, Cortlandt G.

doi:10.1107/s0108270188002367

Cited by 5 publications

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“…In the 3D architecture the chains of [Mo(CN) 8 ] 4− and K + ions are separated by columns of [Co(bpy) 3 ] 3+ ions which have D 3 geometry (trigonally distorted octahedron) with its trigonal axis along the c direction. Average Co−N bond lengths (1.9 Å) and N−Co−N angles (83° for biting angle, 92° for N atoms of two different bpy ligands) are typical for Co-bpy complexes and indicate the presence of Co LS III species. , The shortest Co···Mo distance equals 7.25 Å. All cyano ligands are pointed toward spaces between [Co(bpy) 3 ] 3+ moieties.…”

Section: Resultsmentioning

confidence: 99%

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

et al. 2010

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In this paper we report the synthesis and the structural and magnetic properties of the series of ionic compounds with general formula: M(I)[Co(bpy)(3)][Mo(CN)(8)] x nH(2)O (M(I) = Li, n = 8 (1), M(I) = K, n = 8 (2), M(I) = Rb, n = 8 (3), M(I) = Cs, n = 7.5 (4)). Solids 1-4 are characterized by the optical outer-sphere metal-to-metal charge transfer (MMCT) transition from Mo(IV) center to Co(III) center in the visible region and the Co(III)Mo(IV) <==> Co(II)Mo(V) spin equilibrium strongly dominated by the Co(III)Mo(IV) form. We show a gentle thermal treatment of diamagnetic compounds 1-4 leading to the dehydrated forms 1a-4a, which reveal a significant increase of paramagnetic contribution (from 0.5 to 2% to 30-40%). The rehydration allows to recover the diamagnetic phases 1b-4b of compositions and properties similar to those of 1-4. The irradiation of the dehydrated form 2a within the MMCT band in the Superconducting Quantum Interference Device (SQUID) cavity at T = 10 K causes further increase of the Co(II)Mo(V) contribution giving the metastable phase annealed back to the 2a phase after heating above T = 290 K. The IR, electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS) spectroscopic data along with the magnetic data are interpreted in terms of strong modification of the Co(III)Mo(IV) <==> Co(II)Mo(V) equilibrium occurring in these systems.

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Section: Resultsmentioning

confidence: 99%

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

et al. 2010

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Studies on the synthesis, characterization, human serum albumin binding and biological activity of single chain surfactant–cobalt(III) complexes

et al. 2015

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The interaction of surfactant-cobalt(III) complexes [Co(bpy)(dien)TA](ClO4)3 · 3H2O (1) and [Co(dien)(phen)TA](ClO4)3 · 4H2O (2), where bpy = 2,2'-bipyridine, dien = diethylenetriamine, phen = 1,10-phenanthroline and TA = tetradecylamine with human serum albumin (HSA) under physiological conditions was analyzed using steady state, synchronous, 3D fluorescence, UV/visabsorption and circular dichroism spectroscopic techniques. The results show that these complexes cause the fluorescence quenching of HSA through a static mechanism. The binding constant (Kb ) and number of binding-sites (n) were obtained at different temperatures. The corresponding thermodynamic parameters (∆G°, ∆H° and ∆S°) and Ea were also obtained. According to Förster's non-radiation energy transfer theory, the binding distance (r) between the complexes and HSA were calculated. The results of synchronous and 3D fluorescence spectroscopy indicate that the binding process has changed considerably the polarity around the fluorophores, along with changes in the conformation of the protein. The antimicrobial and anticancer activities of the complexes were tested and the results show that the complexes have good activities against pathogenic microorganisms and cancer cells.

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Biological and protein‐binding studies of newly synthesized polymer–cobalt(III) complexes

et al. 2015

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The polymer-cobalt(III) complexes, [Co(bpy)(dien)BPEI]Cl3 · 4H2O (bpy = 2,2'-bipyridine, dien = diethylentriamine, BPEI = branched polyethyleneimine) were synthesized and characterized. The interaction of these complexes with human serum albumin (HSA) and bovine serum albumin (BSA) was investigated under physiological conditions using various physico-chemical techniques. The results reveal that the fluorescence quenching of serum albumins by polymer-cobalt(III) complexes took place through static quenching. The binding of these complexes changed the molecular conformation of the protein considerably. The polymer-cobalt(III) complex with x = 0.365 shows antimicrobial activity against several human pathogens. This complex also induces cytotoxicity against MCF-7 through apoptotic induction. However, further studies are needed to decipher the molecular mode of action of polymer-cobalt(III) complex and for its possible utilization in anticancer therapy.

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Crystallographic characterization of π-[Co(bpy)(dien)Cl]Cl₂.3H₂O

Cited by 5 publications

References 2 publications

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

Studies on the synthesis, characterization, human serum albumin binding and biological activity of single chain surfactant–cobalt(III) complexes

Biological and protein‐binding studies of newly synthesized polymer–cobalt(III) complexes

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Crystallographic characterization of π-[Co(bpy)(dien)Cl]Cl2.3H2O

Cited by 5 publications

References 2 publications

Series of MI[Co(bpy)3][Mo(CN)8]·nH2O (MI= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

Series of MI[Co(bpy)3][Mo(CN)8]·nH2O (MI= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

Studies on the synthesis, characterization, human serum albumin binding and biological activity of single chain surfactant–cobalt(III) complexes

Biological and protein‐binding studies of newly synthesized polymer–cobalt(III) complexes

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Crystallographic characterization of π-[Co(bpy)(dien)Cl]Cl₂.3H₂O

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process

Series of M^I[Co(bpy)₃][Mo(CN)₈]·nH₂O (M^I= Li (1), K (2), Rb (3), Cs (4);n= 7−8) Exhibiting Reversible Diamagnetic to Paramagnetic Transition Coupled with Dehydration−Rehydration Process