A5064451235- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Metal-Catalyzed Oxygenation Mechanisms
- Metal complexes synthesis and properties
- Lanthanide and Transition Metal Complexes
- Magnetism in coordination complexes
- CO2 Reduction Techniques and Catalysts
- Microbial metabolism and enzyme function
- Porphyrin and Phthalocyanine Chemistry
- Electron Spin Resonance Studies
- Crystallography and molecular interactions
- Carbon dioxide utilization in catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Metalloenzymes and iron-sulfur proteins
- Advanced oxidation water treatment
- Free Radicals and Antioxidants
- Organometallic Complex Synthesis and Catalysis
- Molecular Sensors and Ion Detection
- Polyoxometalates: Synthesis and Applications
- Porphyrin Metabolism and Disorders
- Synthesis and Biological Evaluation
- Heme Oxygenase-1 and Carbon Monoxide
- Natural Fiber Reinforced Composites
- Asymmetric Hydrogenation and Catalysis
- Organic Light-Emitting Diodes Research
Indian Institute of Technology Bhilai
2022-2025
Madurai Kamaraj University
2013-2021
Madurai Medical College
2017-2021
University at Buffalo, State University of New York
2019
University of Graz
2010-2013
Bharathidasan University
2004-2011
University of Neuchâtel
2008
Central Salt and Marine Chemicals Research Institute
2007
Several mononuclear Ni(II) complexes of the type [Ni(L)(CH3CN)2](BPh4)21–7, where L is a tetradentate tripodal 4N ligand such as N,N-dimethyl-N′,N′-bis(pyrid-2-ylmethyl)ethane-1,2-diamine (L1), N,N-diethyl-N′,N′-bis(pyrid-2-ylmethyl)ethane-1,2-diamine (L2), N,N-dimethyl-N′-(1-methyl-1H-imidazol-2-ylmethyl)-N′-(pyrid-2-ylmethyl)ethane-1,2-diamine (L3), N,N-dimethyl-N′,N′-bis(1-methyl-1H-imidazol-2-ylmethyl)ethane-1,2-diamine (L4), N,N-dimethyl-N′,N′-bis(quinolin-2-ylmethyl)ethane-1,2-diamine...
The iron(III) complexes of the monophenolate ligands 2-(bis(pyrid-2-ylmethyl)aminomethyl)-4-nitrophenol [H(L1)], N,N-dimethyl-N'-(pyrid-2-ylmethyl)-N'-(2-hydroxy-4-nitrobenzyl)ethylenediamine [H(L2)], N,N-dimethyl-N'-(6-methyl-pyrid-2-ylmethyl)-N'-(2-hydroxy-4-nitrobenzyl)ethylenediamine [H(L3)], and N,N-dimethyl-N'-(1-methylimidazole-2-ylmethyl)-N'-(2-hydroxy-4-nitrobenzyl)ethylenediamine [H(L4)] have been obtained studied as structural functional models for intradiol-cleaving catechol...
The iron(III) complexes [Fe(L)Cl2] 1−6 of the tripodal monophenolate ligands N,N-bis(2-pyridylmethyl)-N′-(2-hydroxybenzyl)amine H(L1), [(1-methylimidazol-2-ylmethyl)-(pyrid-2-ylmethyl)aminomethyl]-phenol H(L2), 2,4-dimethyl-6-[(1-methylimidazol-2-ylmethyl)(pyrid-2-ylmethyl)aminomethyl]phenol H(L3), N,N-dimethyl-N′-(pyrid-2-ylmethyl)-N′-(2-hydroxybenzyl)ethylenediamine H(L4), N,N-dimethyl-N′-(1-methylimidazol-2-ylmethyl)-N′-(2-hydroxybenzyl)ethylenediamine H(L5), and...
A series of iron(III) complexes the type [Fe(L)Cl3], where L is variously N-alkyl-substituted bis(pyrid-2-ylmethyl)amine ligand such as (L1), N,N-bis(pyrid-2-ylmethyl)methylamine (L2), N,N-bis(pyrid-2-ylmethyl)-n-propylamine (L3), N,N-bis(pyrid-2-ylmethyl)-iso-butylamine (L4), N,N-bis(pyrid-2-ylmethyl)-iso-propylamine (L5), N,N-bis(pyrid-2-ylmethyl)cyclohexylamine (L6), and N,N-bis(pyrid-2-ylmethyl)-tert-butylamine (L7), have been isolated characterized by elemental analysis spectral...
Overexpression of cysteine cathepsins proteases has been documented in a wide variety cancers, and enhances the l-cysteine concentration tumor cells. We report synthesis characterization copper(ii) complexes [Cu(L1)2(H2O)](SO3CF3)2, 1, L1 = 3-phenyl-1-(pyridin-2-yl)imidazo[1,5-a]pyridine, [Cu(L2)2(SO3CF3)]SO3CF3, 2, L2 3-(4-methoxyphenyl)-1-pyridin-2-yl-imidazo[1,5-a]pyridine, [Cu(L3)2(H2O)](SO3CF3)2, 3, L3 3-(3,4-dimethoxy-phenyl)-1-pyridin-2-yl-imidazo[1,5-a]pyridine...
A series of bioinspired copper(II) complexes N4-tripodal and sterically crowded diazepane-based ligands have been investigated as catalysts for functionalization the aromatic C-H bond. The tripodal-ligand-based exhibited distorted trigonal-bipyramidal (TBP) geometry (τ, 0.70) around center; however, diazepane-ligand-based adopted square-pyramidal (SP) 0.037). Cu-NPy bonds (2.003-2.096 Å) are almost identical shorter than Cu-Namine (2.01-2.148 Å). Also, their Cu-O (Cu-Owater, 1.988 Å;...
The new iron(III) complex [Fe(L3)Cl2], where H(L3) is the tripodal monophenolate ligand N,N-dimethyl-N'-(pyrid-2-ylmethyl)-N'-(2-hydroxy-3,5-dimethylbenzyl)ethylenediamine, has been isolated and studied as a structural functional model for catechol dioxygenase enzymes. possesses distorted octahedral coordination geometry constituted by phenolate oxygen, pyridine nitrogen two amine nitrogens of tetradentate ligand, cis-coordinated chloride ions. Fe−O−C bond angle (134.0°) Fe−O length (1.889...
Three novel non-heme micro-oxo-bridged diiron(III) complexes [Fe2(micro-O)(L1)2] 2, where H2(L1) is N,N'-o-phenylenebis(salicylideneimine), [Fe2(micro-O)(L2)2].2H2O 4, H2(L2) N,N'-o-phenylenebis(3,5-di-tert-butylsalicylideneimine), and [Fe2(micro-O)(L3)2] 6, H2(L3)=1,4-bis(2-hydroxybenzyl)-1,4-diazepane, have been isolated studied as catalysts for the selective oxidative transformation of alkanes into alcohols using m-choloroperbenzoic acid (m-CPBA) co-oxidant. The mononuclear iron(III)...
The iron(III) complexes of the 4N ligands 1,4-bis(2-pyridylmethyl)−1,4-diazepane (L1), 1,4-bis(6-methyl-2-pyridylmethyl)-1,4-diazepane (L2), and 1,4-bis(2-quinolylmethyl)-1,4-diazepane (L3) have been generated in situ CH3CN solution, characterized as [Fe(L1)Cl2]+ 1, [Fe(L2)Cl2]+ 2, [Fe(L3)Cl2]+ 3 by using ESI-MS, absorption EPR spectral electrochemical methods studied functional models for extradiol cleaving catechol dioxygenase enzymes. tetrachlorocatecholate (TCC2−) adducts...
Abstract The asymmetric molybdenum(VI) dioxo complexes of the bis(phenolate) ligands 1,4‐bis(2‐hydroxybenzyl)‐1,4‐diazepane, 1,4‐bis(2‐hydroxy‐4‐methylbenzyl)‐1,4‐diazepane, 1,4‐bis(2‐hydroxy‐3,5‐dimethylbenzyl)‐1,4‐diazepane, 1,4‐bis(2‐hydroxy‐3,5‐di‐ tert ‐butylbenzyl)‐1,4‐diazepane, 1,4‐bis(2‐hydroxy‐4‐flurobenzyl)‐1,4‐diazepane, and 1,4‐bis(2‐hydroxy‐4‐chlorobenzyl)‐1,4‐diazepane (H 2 (L1)–H (L6), respectively) have been isolated studied as functional models for molybdenum oxotransferase...
The iron(III) complexes of the bis(phenolate) ligands 1,4-bis(2-hydroxy-4-methyl-benzyl)-1,4-diazepane H2(L1), 1,4-bis(2-hydroxy-4-nitrobenzyl)-1,4-diazepane H2(L2), 1,4-bis(2-hydroxy-3,5-dimethylbenzyl)-1,4-diazepane H2(L3) and 1,4-bis(2-hydroxy-3,5-di-tert-butylbenzyl)-1,4-diazepane H2(L4) have been isolated studied as structural functional models for 3,4-PCD enzymes. [Fe(L1)Cl] 1, [Fe(L2)(H2O)Cl] 2, [Fe(L3)Cl] 3 [Fe(L4)Cl] 4 characterized using ESI-MS, elemental analysis, absorption...
A simple copper(II) complex of the anthracenyl‐appended terpyridine ligand 4′‐(anthracen‐9‐yl)‐2,2′:6′,2′′‐terpyridine (L), [Cu(L)Cl 2 ] ( 1 , ESI‐MS, m/z = 507.08), is reported as a highly selective “turn‐on” optical imaging probe for l ‐cysteine. Probe shows Cu II /Cu I redox potential [ E 1/2 –0.194 V versus normal hydrogen electrode (NHE)] within biologically viable range. The copper center in adopts square‐pyramidal geometry τ 0.0851), and Cu–N py bond (1.970 Å) middle pyridine (py)...
Several paramagnetic Co(II) and Fe(II) macrocyclic complexes were prepared with the goal of introducing a bound water ligand to produce paramagnetically shifted 1H resonances for chemical exchange saturation transfer (paraCEST) applications. Three 12-membered macrocycles amide pendent groups including 1,7-bis(carbamoylmethyl)-1,4,7,10-tetraazacyclodocane (DCMC), 4,7,10-tris(carbamoylmethyl)-,4,7,10-triaza-12-crown-ether (N3OA), 4,10-bis(carbamoylmethyl)-4,10-diaza-12-crown-ether (NODA) their...
A novel copper(I) complex, [CuI(L)(CH3CN)]CF3SO3 (1) (L = 1,1,2-tri(pyridin-2-yl)propan-1-ol), has been synthesized, characterized, and investigated as a bioinspired model for copper monooxygenases. Under aerobic conditions in CH3CN, complex 1 undergoes conversion to dicopper [(CuIIL)(CuIIL H)(SO3CF3)2]·CF3SO3·H2O (2), whose molecular structure reveals Cu-Cu distance of 2.96 Å. dicopper(II) [(LCuII)2(SO3CF3)2] (3), synthesized comparison, which exhibits similar 2.97 EPR spectroscopy...
Activation of CO2 and conversion into value-added products is an effective option to mitigate emission. The nickel(II) complexes [Ni(L1)](ClO4)2 1, [Ni(L2)](ClO4)2 2, [Ni(L3)(CH3CN)2](Ph4B)2 3 diazepane-based ligands [1,4-bis[(pyridin-2-yl-methyl)]-1,4-diazepane (L1), 1,4-bis[2-(pyridin-2-yl)ethyl]-1,4-diazepane (L2), 4-bis[2-(quinoline-2-yl)-methyl]-1,4-diazepane (L3)] have been synthesized structurally characterized. were employed as the catalysts for atmospheric organic carbonates in...
Nickel(<sc>ii</sc>)complexes of N<sub>4</sub>-ligands are reported as efficient catalysts for direct benzene hydroxylation<italic>via</italic>bis(μ-oxo)dinickel(<sc>iii</sc>) intermediate species. The exclusive phenol formation is achieved with a yield 41%.
Cobalt(<sc>ii</sc>) complexes reported as efficient and selective catalysts for single-step phenol formation from benzene using H<sub>2</sub>O<sub>2</sub>. The catalysis proceeds likely <italic>via</italic> cobalt(<sc>iii</sc>)-hydroperoxo species.
Cu(<sc>i</sc>) complexes were synthesized<italic>via</italic>spontaneous reduction and X-ray crystal structure of complex<bold>1</bold>was determined. Direct hydroxylation benzene to phenol afforded selectivity up 98%. KIE values 1.69–1.71 supported radical based mechanism.
Copper(ii) complexes [Cu(L1)(H2O)2](SO3CF3)21 and [Cu(L2)(H2O)2](SO3CF3)22 based on 2,6-bis(benzimidazolyl)pyridine were synthesized are reported herein as highly selective "turn-on" optical probes for l-cysteine. The Cu(ii)/Cu(i) redox potential of probe 1 (0.14 V vs. NHE) was lower than that 2 (0.233 in water. molecular structure adopted a square pyramidal geometry (τ = 0.2545), with the Cu-Npy bond (1.958 Å) its middle pyridine unit being shorter other two Cu-Nbenzim bonds (Cu-N, 1.995,...
New copper(ii) complexes, [Cu(L1)2(H2O)](ClO4)2, 1 [L1 = 2-pyridin-2-yl-quinoline], [Cu(L2)2(H2O)](ClO4)2, 2 [L2 2-pyridin-2-yl-quinoxaline], [Cu(L3)2(H2O)](ClO4)2, 3 [L3 6,7-dimethyl-2-pyridin-2-yl-quinoxaline], [Cu(L4)2(H2O)](ClO4)2, 4 [L4 4-phenyl-2-pyridin-2-yl-quinoline] and [Cu(L5)2(H2O)](ClO4)2, 5 [L5 4-phenyl-2-pyridin-2-yl-quinazoline], were synthesized characterized as catalysts for selective fixation of atmospheric CO2. The molecular structure was determined by single-crystal...
Abstract The new mononuclear Ru III complexes [Ru(ntb)Cl 2 ]Cl ( 1 ), ]ClO 4 1a and [Ru(mntb)Cl ) (ntb = tris(benzimidazol‐2‐ylmethyl)amine, mntb tris( N ‐methylbenzimidazol‐2‐ylmethyl)amine) have been synthesized characterized. X‐ray crystal structure of reveals that the coordination geometry around center is distorted octahedral in which four sites are occupied by tetradentate ligand ntb remaining cis positions two chloride ions. stronger Ru–N bzim bonds elongate Ru–Cl thereby labilizing...