Kinetics of reduction of cis-bis(dodecylamine)bis(1,10-phenanthroline)cobalt(III) perchlorate and cis-bis(dodecylamine)bis(2,2′-bipyridine)cobalt(III) perchlorate by Fe(II) in dipalmitoylphosphatidylcholine vesicles

Nagaraj, Karuppiah; Arunachalam, S.

doi:10.1007/s00706-013-1080-x

Cited by 9 publications

(3 citation statements)

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“…22 We have been interested in the synthesis and micelle forming properties of Co(III)/Cu(II) complexes containing lipophilic ligands. [23][24][25][26][27][28][29][30][31][32][33] As in biology, such compounds may exhibit novel physical and chemical properties with interesting and useful associated applications. In metal-based drugs, the metal can coordinate ligands in a precise threedimensional configuration, thus allowing the tailoring of the molecule to recognize and interact with a specific molecular target.…”

Section: Introductionmentioning

confidence: 99%

Influence of self-assembly on intercalative DNA binding interaction of double-chain surfactant Co(iii) complexes containing imidazo[4,5-f][1,10]phenanthroline and dipyrido[3,2-d:2′-3′-f]quinoxaline ligands: experimental and theoretical study

et al. 2014

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A new class of surfactant Co(III) complexes, cis-[Co(ip)2(C12H25NH2)2](ClO4)3 (1) and cis-[Co(dpq)2(C12H25NH2)2](ClO4)3 (2) (ip = imidazo[4,5-f][1,10]phenanthroline, dpq = dipyrido[3,2-d:2'-3'-f]quinoxaline), have been synthesized and characterized by various spectroscopic and physico-chemical techniques. The critical micelle concentration (CMC) values of these complexes in aqueous solution were obtained from conductance measurements. The specific conductivity data (at 303, 308, 313, 318 and 323 K) served for the evaluation of the temperature-dependent CMC and the thermodynamics of micellization (ΔG(0)(m), ΔH(0)(m) and ΔS(0)(m)). The trend in DNA-binding affinities and the spectral properties of a series of complexes, cis-[Co(ip)2(C12H25NH2)2](ClO4)3 (1) and cis-[Co(dpq)2(C12H25NH2)2](ClO4)3 (2), have been experimentally and theoretically investigated. The experimental results indicate that the size and shape of the intercalated ligand and hydrophobicity of the complexes have a marked effect on the binding affinity of the complexes to CT DNA in intercalation mode, and the order of their intrinsic DNA-binding constants Kb is Kb(1) < Kb(2). In addition, the influence of the extended aromatic ring and optical properties of the complexes can be reasonably explained by applying the DFT calculations. The energy gap between HOMO and LUMO indicates that these complexes are prone to interact with CT DNA. Further, molecular docking calculations have also been performed to understand the nature of binding of the complexes and the result confirms that the complexes interact with CT DNA through the alkyl chain. The cytotoxic activity of these complexes on human liver carcinoma cancer cells were determined adopting MTT assay and specific staining techniques, which revealed that the viability of the cells thus treated was significantly decreased and the cells succumbed to apoptosis as seen in the changes in the nuclear morphology and cytoplasmic features.

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Section: Introductionmentioning

confidence: 99%

Influence of self-assembly on intercalative DNA binding interaction of double-chain surfactant Co(iii) complexes containing imidazo[4,5-f][1,10]phenanthroline and dipyrido[3,2-d:2′-3′-f]quinoxaline ligands: experimental and theoretical study

et al. 2014

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“…From a fundamental prospect, ionic liquids facilitate solvatophobic interactions, which are present among ionic liquids and surfactants, enhancing the solvation characteristics of the ionic liquid–surfactant system [ 32 , 33 , 34 ]. The outer-sphere electron transfer reactions of innumerable metallomicelles have been developed in our laboratory [ 35 , 36 , 37 , 38 ]. We have reported that both the oxidant and reductant are cations on the electron transfer between surfactant complexes with iron(II) in DPPC [ 35 , 36 , 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

“…The outer-sphere electron transfer reactions of innumerable metallomicelles have been developed in our laboratory [ 35 , 36 , 37 , 38 ]. We have reported that both the oxidant and reductant are cations on the electron transfer between surfactant complexes with iron(II) in DPPC [ 35 , 36 , 37 , 38 , 39 ]. In the present work, we present our results on the influence of phase transition behavior in ionic liquids and liposome vesicles on the outer-sphere electron transfer between surfactant complexes containing aromatic diimine ligands and ferrocyanide ions.…”

Section: Introductionmentioning

confidence: 99%

States of Aggregation and Phase Transformation Behavior of Metallosurfactant Complexes by Hexacyanoferrate(II): Thermodynamic and Kinetic Investigation of ETR in Ionic Liquids and Liposome Vesicles

Nagaraj¹,

Sakthinathan

Chiu

et al. 2022

Biomimetics

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Electronic absorption spectroscopy was used to study the ETR of surfactant–cobalt(III) complexes containing imidazo[4,5-f][1,10]phenanthroline, dipyrido[3,2-d:2′-3′-f]quinoxaline and dipyrido[3,2-a:2′,4′-c](6,7,8,9-tetrahydro)phenazine ligands by using ferrocyanide ions in unilamellar vesicles of dipalmitoylphosphotidylcholine (DPPC) and 1-butyl-3-methylimidazolium bromide ((BMIM)Br), at different temperatures under pseudo-first-order conditions using an excess of the reductant. The reactions were found to be second-order and the electron transfer is postulated as occurring in the outer sphere. The rate constant for the electron transfer reactions was found to increase with increasing concentrations of ionic liquids. Besides these, the effects of surfactant complex ions on liposome vesicles in these same reactions have also been studied on the basis of hydrophobicity. We observed that, below the phase transition temperature, there is an increasing amount of surfactant–cobalt(III) complexes expelled from the interior of the vesicle membrane through hydrophobic effects, while above the phase transition temperature, the surfactant–cobalt(III) complexes are expelled from the interior to the exterior surface of the vesicle. Kinetic data and activation parameters are interpreted in respect of an outer-sphere electron transfer mechanism. By assuming the existence of an outer-sphere mechanism, the results have been clarified based on the presence of hydrophobicity, and the size of the ligand increases from an ip to dpqc ligand and the reactants become oppositely charged. In all these media, the ΔS# values are recognized as negative in their direction in all the concentrations of complexes employed, indicative of a more ordered structure of the transition state. This is compatible with a model in which these complexes and [Fe(CN)6]4− ions bind to the DPPC in the transition state. Thus, the results have been interpreted based on the self-aggregation, hydrophobicity, charge densities of the co-ligand and the reactants with opposite charges.

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Reduced Graphene Oxide Supported Cobalt Bipyridyl Complex for Sensitive Detection of Methyl Parathion in Fruits and Vegetables

et al. 2017

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Herein, we are described a green route to prepare reduced graphene oxide supported cobalt inorganic complex nanocomposite (GRGO/[Co(bpy)3]) (bpy=2,2′‐bipyridine) through facile and wet chemical approach. The formation of the nanocomposite was confirmed through suitable physical and chemical characterization techniques. The GRGO/[Co(bpy)3] nanocomposite was coated on the pretreated glassy carbon electrode (GCE). The GCE/GRGO/[Co(bpy)3] modified electrode has excellent electrocatalytic ability towards methyl parathion reduction, while the overpotential drops drastically to –0.18 V (vs. Ag/AgCl). Moreover, the effect of concentration, scan rate and electrolyte pH were detail studied. Besides, the linear response range was 0.05‐1700 μM and the detection limit was 0.0029 μM (S/N=3) and the sensitivity was 1.8197 μA μM−1 cm−2. Moreover, the fabricated electrode has high level of selectivity, which delivers satisfactory repeatability, reproducibility and stability. The sensing method was successfully demonstrated in real samples such as, tomato and apple samples.

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Kinetics of reduction of cis-bis(dodecylamine)bis(1,10-phenanthroline)cobalt(III) perchlorate and cis-bis(dodecylamine)bis(2,2′-bipyridine)cobalt(III) perchlorate by Fe(II) in dipalmitoylphosphatidylcholine vesicles

Cited by 9 publications

References 30 publications

Influence of self-assembly on intercalative DNA binding interaction of double-chain surfactant Co(iii) complexes containing imidazo[4,5-f][1,10]phenanthroline and dipyrido[3,2-d:2′-3′-f]quinoxaline ligands: experimental and theoretical study

Influence of self-assembly on intercalative DNA binding interaction of double-chain surfactant Co(iii) complexes containing imidazo[4,5-f][1,10]phenanthroline and dipyrido[3,2-d:2′-3′-f]quinoxaline ligands: experimental and theoretical study

States of Aggregation and Phase Transformation Behavior of Metallosurfactant Complexes by Hexacyanoferrate(II): Thermodynamic and Kinetic Investigation of ETR in Ionic Liquids and Liposome Vesicles

Reduced Graphene Oxide Supported Cobalt Bipyridyl Complex for Sensitive Detection of Methyl Parathion in Fruits and Vegetables

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