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Pattanayak P.,Kalyani University | Patra D.,East Calcutta Girls College | Brandao P.,University of Aveiro | Mal D.,University of Aveiro | Felix V.,University of Aveiro
Inorganic Chemistry Communications | Year: 2015

Reaction of ligand, L-CH2Ph with Pd(CH3CN)2Cl2 in acetonitrile in presence of PPh3 and subsequent addition of NaClO4 yielded Pd(II) complex, [Pd(L)(PPh3)](ClO4) 1 due to the SC (CH2Ph) bond cleavage during complexation. Complex 1 was characterized by spectral analysis and the structure was authenticated by single crystal X-ray diffraction. The diffraction analysis revealed that the monoanionic ligand binds with palladium (II) in (N, N, S) fashion in a distorted square planar geometry where the fourth position is occupied by one tri phenyl phosphine group. One ClO4 - ion satisfies the charge of the former aggregate, [Pd(L)(PPh3)]+. The complex [Pd(L)(PPh3)](ClO4), 1 exhibits a very good catalytic activity towards CC bond formation. © 2015 Elsevier B.V. All rights reserved. Source


Pattanayak P.,Kalyani University | Pratihar J.L.,Kalyani University | Pratihar J.L.,Kandi Raj College | Patra D.,Kalyani University | And 3 more authors.
Polyhedron | Year: 2013

The 2-((2-benzylamino)phenyldiazenyl)phenol, H2OL [where H 2OL = ArOHN = NC6H4N(H)CH2(C 6H5); Ar = C6H5 (for H2OL1), p-MeC6H4 (for H2OL2) or p-ClC 6H4 (for H2OL3)], ligands were prepared by the reaction of the appropriate 2-((2-hydroxyaryl)azo)anilines with benzyl bromide. The reactions of Na2PdCl4 with H 2OL afforded tetranuclear Pd(II) complexes of the composition [Pd(OL)]4. The ligands bind palladium(II) in a tridentate (N, N, O) fashion. The X-ray structure of [Pd(OL1)]4 was determined to confirm the characterization. The newly synthesized [Pd(OL1)] 4 complex was utilized as a catalyst for the Suzuki and Heck reaction for a variety of substrates. © 2013 Elsevier Ltd. All rights reserved. Source


Pattanayak P.,Kalyani University | Pratihar J.L.,Kandi Raj College | Patra D.,East Calcutta Girls College | Brandao P.,University of Aveiro | Felix V.,University of Aveiro
Inorganica Chimica Acta | Year: 2014

Newly designed tridentate ligand, HL 1 derived from 2-(benzylthio)aniline and 2-hydroxy-1-naphthaldehyde, upon reaction with Cu(II), Ni(II) and Co(III) nitrate separately in methanol yielded binuclear Cu(II) complex, [Cu 2(L)2(NO3)2] 2, and mononuclear [Ni(L)2] 3 and [Co(L)2](NO3) 4 which were characterized by spectral data and authenticated by single crystal X-ray diffraction of 2 and 3. The diffraction analysis revealed that the ligand binds to metals in (O, N, S) fashion. Single crystal X-ray diffraction studies confirmed that the [Cu2(L)2(NO3)2] complex consist of centrosymmetric binuclear entities containing square-pyramidal copper(II) ions bridged through the phenoxo oxygen atoms. The emission and redox properties of both the ligand and corresponding complexes were examined. The redox property of the complexes has been qualitatively explained by single point DFT calculations. The catalytic activities of Cu(II) complex [Cu2(L)2(NO3)2] towards oxidation of benzyl alcohol derivatives to carbonyl compounds was tested using H2O2 as the oxidant. © 2014 Elsevier B.V. All rights reserved. Source


Patra D.,Kalyani University | Patra D.,East Calcutta Girls College | Pattanayak P.,Kalyani University | Pratihar J.L.,Kalyani University | And 2 more authors.
Polyhedron | Year: 2013

The reactions of 1-{[2-(arylazo)phenyl]iminomethyl}-2-naphthol, H 2Lnap [where H represents the dissociable proton upon complexation and aryl groups of H2Lnap are phenyl for H2L1 nap; p-methyl phenyl for H 2L2 nap and p-chloro phenyl for H 2L3 nap] with nickel acetate tetra hydrate or disodium tetrachloropalladate in methanol afforded M-C(aryl) bonded species of composition [M(Lnap)] (M = Ni(II) and Pd (II)). The dinegative (Lnap)2- ligands bind the Ni(II) or Pd(II) in tetradentate (C, N, N, O) fashion in distorted square planar geometry. Ligands and complexes were characterized by spectroscopic methods. The X-ray structures of H 2L1 nap, [Ni(L1 nap)] and [Pd(L1 nap)] were determined to authenticate the characterization. Reactions with metachloroperbenzoic acid (mCPBA), TBHP and hydrogen peroxide leading to oxygen insertion into the M-C bond have been examined. Luminescent properties of ligands and complexes have been reported. © 2012 Elsevier Ltd. All rights reserved. Source


Pattanayak P.,Kalyani University | Pratihar J.L.,Kandi Raj College | Patra D.,East Calcutta Girls College | Brandao P.,University of Aveiro | And 2 more authors.
Polyhedron | Year: 2013

The newly designed multidentate ligand HL, derived from 2-(benzylthio)aniline and 2-hydroxy-5-methylbenzene-1,3-dialdehyde, upon reaction with Cu(II) perchlorate in methanol yielded the binuclear Cu(II) complex [Cu2(L)(μ-OH)](ClO4)2 (1), which was authenticated by single crystal X-ray diffraction. The diffraction analysis revealed that the ligand binds each of the two Cu(II) centers in an (O, N, S) fashion in a distorted square pyramidal geometry where the two copper centers are bridged by μ-phenoxo and μ-hydroxo oxygen atoms. The apical position of one copper center is coordinated by one perchlorate ion and the other center by a water molecule. The packing of the molecule is stabilized through OH 2â̄O hydrogen bonds, mediated through solvent water and perchlorate anions. The emission and redox properties of both the ligand and the complex were examined. The electronic spectra and redox properties of the complex have been explained with DFT computations. The complex [Cu 2(L)(μ-OH)](ClO4)2 shows very good catalytic activities towards the oxidation of benzyl alcohol to benzaldehyde and organic thioethers to the corresponding sulfoxide and sulfones using H2O 2 as the oxidant. © 2013 Elsevier Ltd. All rights reserved. Source

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