A5064953945- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Electrocatalysts for Energy Conversion
- CO2 Reduction Techniques and Catalysts
- Metal complexes synthesis and properties
- Metalloenzymes and iron-sulfur proteins
- Advanced battery technologies research
- Magnetism in coordination complexes
- Metal-Catalyzed Oxygenation Mechanisms
- Carbon dioxide utilization in catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Porphyrin and Phthalocyanine Chemistry
- Molecular Sensors and Ion Detection
- Advanced oxidation water treatment
- Lanthanide and Transition Metal Complexes
- Electrochemical Analysis and Applications
- Nanomaterials for catalytic reactions
- Ionic liquids properties and applications
- Catalytic Cross-Coupling Reactions
- Organometallic Complex Synthesis and Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Thermal and Kinetic Analysis
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Synthesis and Biological Evaluation
Indian Institute of Technology Dhanbad
2014-2024
Institute for Molecular Science
2011-2012
Indian Institute of Technology Guwahati
2006-2011
In this work, two novel dinuclear cobalt complexes, [CoII(hbqc)(H2O)]2 (Co-Cl) and [CoII(hbqn)(H2O)]2 (Co-NO2), featuring benzimidazole derived redox-active ligand have been synthesized to investigate their catalytic activities toward electrocatalytic proton reduction (where hbqc is 2-{[6-chloro-2-(8-hydroxyquinolin-2-yl)-1H-benzimidazol-1-yl]methyl}quinolin-8-ol hbqn 2-{[6-nitro-2-(8-hydroxyquinolin-2-yl)-1H-benzimidazol-1-yl]methyl}quinolin-8-ol). The electrochemical responses in 95/5...
Photoisomeric transformations in ruthenium polypyridyl complexes have been rarely reported. Herein we report the geometrical transformation of cyclometalated trans-[Ru(tpy)(PAD)(OH(2))](+) ([1](+)) to cis-[Ru(tpy)(PAD)(OH(2))](+) ([1a](+)) (tpy = 2,2';6',2"-terpyridine, PAD 2-(pyrid-2'-yl)acridine) isomer upon irradiation visible light (λ ≥420 nm). Due a proton-induced tautomeric equilibrium between Ru-C bond and Ru═C coordination, π* energy levels PADH are lower than those tpy by 12.61...
N-(2-Pyridylmethyl)pyridine-2-methylketimine (L1) was synthesized from equimolar quantities of (2-pyridyl)methylamine and 2-acetylpyridine. Methanolic solution L1 reacted readily with Cu(NO3)2·3H2O in air, affording green solid composition {[Cu(L2)(OH)(NO3)][Cu(L2)(NO3)2]}·2H2O, where L2 is 4'-(2-pyridyl)-2,2':6',2' '-terpyridine. Oxidation the active methylene group to an imide then condensation 2-acetylpyridine involving a C−C bond-forming reaction, mediated by Cu2+ ion, are essential...
A dicarboxamide based nickel complex with an internal quinoline moiety, acts as active photocatalyst for proton reduction achieving 2160 turnovers. The pendant base functions relay towards the metal center to generate H<sub>2</sub>following a CECE (C = Chemical, E Electrochemical) mechanistic path.
The interconversion of the binuclear copper complex <bold>[Cu(DQPD)]2</bold> to mononuclear [Cu(DQPD)]<sup>+</sup> has been studied and their catalytic behaviour towards proton reduction reported.
The homodinuclear CoII helicate complex [CoII(DQPD)]2 (1) was prepared by treating [Co(H2O)6](ClO4)2 with the deprotonated form of ligand N2,N6-bis(quinolin-8-yl)pyridine-2,6-dicarboxamide (DQPDH2). Complex 1 represents a discrete two centers having distorted-octahedral geometry through an unprecedented pyridine bridge. 1, upon treatment H2O2, undergoes oxidation at one followed structural deformation to generate mixed-valence [CoIIICoII(DQPD)2](ClO4) (2·ClO4). In 2, bridging central...
Fly ash (FA)-supported bimetallic nanoparticles (PdxAgy/FA) with varying Pd:Ag ratios were prepared by coprecipitation of Pd and Ag involving in situ reduction Pd(II) Ag(I) salts aqueous medium. All the supported thoroughly characterized aid powder X-ray diffraction (PXRD), photoelectron spectroscopy (XPS), electron microscopy (field emission scanning (FE-SEM) transmission (TEM)), elemental analyses, which include inductively coupled plasma-optical (ICP-OES) energy-dispersive (EDS). A...
Two dinuclear Co II complexes 1 and 2 have been synthesized characterized using various spectroscopic methods. Both the were employed for H + reduction in organic media. Faradaic efficiency of 82–90% was obtained evolution.
Cyclometalated ruthenium(II) complexes having acridine moieties have been synthesized and characterized by spectroscopic methods. Protonation of the nitrogen not only causes dynamic equilibrium with remote N-heterocyclic carbene Ru═C but also generates NAD+/NADH redox function driven a proton-coupled two-electron transfer accompanying reversible C–H bond formation in pyridinium ring.
Cyclometalated Ru(II) complexes having a 3-phenylbenzo[b][1,6]naphthyridine (phbn) ligand have been synthesized and characterized by spectroscopic methods. The photo- electrochemical redox behavior of the are demonstrated. Complex [Ru(phbn)(bpy)2]PF6 ([1]PF6) readily undergoes proton coupled two electron reduction chemical, electrochemical, photochemical methods to generate [Ru(phbnHH)(bpy)2]PF6 ([1HH]PF6). oxidation [1HH]PF6 was also observed in presence p-chloranil.
The complexes [Co II (QCl‐tpy) 2 ]Cl ( 1 ) and III ](PF 6 3 [where QCl‐tpy = 2‐chloro‐3‐(2,6‐di(pyridin‐2‐yl)pyridine‐4‐yl) quinoline] have been synthesised characterised by various spectroscopic techniques. Complex acts as a hydrogen‐evolving catalyst under electrochemical photochemical conditions. It exhibits proton reduction irradiation with visible light in the presence of [Ru(bpy) photosensitiser ascorbic acid sacrificial electron donor. formation (QCl‐tpy)( QCl‐tpyH)DMF] 3+ was...
Cyclometalated ruthenium complexes having C∧N and N∧C type coordinating ligands with NAD+/NADH function have been synthesized characterized by spectroscopic methods. The variation of the position σ-donating carbon atom leads to a drastic change in their properties. Both complex Ru(phbn)(phen)2]PF6 ([1]PF6) [Ru(pad)(phen)2]PF6 ([2]PF6) reduced Ru(phbnHH)(phen)2]PF6 ([1HH]PF6) [Ru(padHH)(phen)2]PF6 ([2HH]PF6) chemical electrochemical Complex [1]PF6 photochemically [1HH]PF6 presence sacrificial...
The complexes [Ru(2‐py‐tpy)(bpy)(OH 2 )][PF 6 ] ( 1 ; bpy = 2,2′‐bipyridine), [Ru(3‐py‐tpy)(bpy)(OH ), and [Ru(4‐py‐tpy)(bpy)(OH 3 n ‐py‐tpy 4′‐( ‐pyridyl)‐2,2′:6′,2′′‐terpyridine, 2–4), as electronic modifications of the [Ru(tpy)(bpy)(OH scaffold, have been synthesized characterized thoroughly by several spectroscopic methods. All three were employed catalysts for chemical photochemical water oxidation. free nitrogen atom pyridine ring in – is protonated at pH acts an electron‐withdrawing...
This study presents the synthesis of 4-(2,6-di(pyridin-2-yl)pyridin-4-yl)quinoline (4Ql-tpy) ligand and H<sub>2</sub> evolution by corresponding cobalt complex, <italic>i.e.</italic> [Co(4Ql-tpy)<sub>2</sub>]Cl<sub>2</sub>.
The complex [Ru(NCN-Me)(bpy)H<sub>2</sub>O](PF<sub>6</sub>)<sub>2</sub>acts as an active catalyst for the photo-driven oxidation of water, when employed with [Ru(bpy)<sub>3</sub>]<sup>2+</sup>as photosensitizer and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>as sacrificial electron acceptor at pH 6.5 phosphate buffer, a TON 130.
Due to the requirement establish renewable energy sources, formic acid (FA), one of most probable liquid organic hydrogen carriers (LOHCs), has received great attention. Catalytic dehydrogenation in an effective and environmentally friendly manner is still a challenge. The N3Q3 ligand (N3Q3 =
[Ru(V)[double bond, length as m-dash]O](3+) and [Ru(VI)[double m-dash]O](4+) generated from [Ru(II)(NCN-Me)(bpy)(H2O)](PF6)2 (where NCN-Me is the neutral N-methyl-3,5-di(2-pyridyl)pyridinium iodide after deprotonation of C-H bond) play a selective role in bond oxidation 2-(pyridin-2-yl)-9,10-dihydroacridine (PADHH) water oxidation, respectively.
Abstract The mononuclear [Ru(QCl‐tpy)(bpy)(H 2 O)](PF 6 ) was successfully synthesized and characterized by using several spectroscopic techniques (QCl‐tpy=2‐4′‐(2‐chloroquinolin‐3‐yl)‐2,2′:6′,2′′‐terpyridine). This complex shows only one pK a value at 10.2, due to the deprotonation from bonded aqua ligand. employed as catalyst for chemical water oxidation in CF 3 SO H solution (pH 1.0) Ce IV an oxidant, initial turnover frequency (TOF) of 0.0014 s −1 . manometry electrochemical data that...