X-ray photoelectron spectral study was made on the complexes Ni(nmedtc)(2)(1), [Ni(nmedtc)(PPh3)(2)]ClO4(2), [Ni-(nmedtc)(dppe)]BPh4(3) (where nmedtc = N-methyl,N-ethanoldithiocarbamate, dppe = 1.2-bis(diphenylphosphino)ethane). The nickel 2P(3/2) binding energy values for chelated and free phosphine complexes are 854.0 and 854.1 eV which are significantly different from Ni2p(2/3) BE value of NiS4 chromophore, indicating the relative dearth of electron density on Ni in NiS2P2 chromophores. The presence of two phosphine groups in NiS2P2 chromophore alleviates the electron density on the metal atom. More electron density is being pulled away from the metal atom in chelates than in the PPh3 analogue. This observation is in line with solution studies by cyclic voltammetry. A one-electron reduction potential was observed to be the minimum for NiS2P2 chromophores compared to the others. Also the crystal structure of the complex [Ni(pipdtc)(1,4-dppb)]ClO4 (pipdtc(-) = piperidinecarbodithioato anion, 1,4-dppb = bis(diphenylphosphino)butane) prepared by the reaction between Ni(pipdtc)(2). (NiCl26H2O)-H-.. and 1.4-dppb in CH3CN-between is reported.
X-Ray Photoelectron Spectral Studies on Planar NiS4 and NiS2P2 Chromophores. Single Crystal X-Ray Structural Study on [1, 4-Bis(diphenylphosphino-k, P, P')butane](piperidinecarbodithioato-S, S')-Nickel(II) Perchlorate / R., Thiruneelakandan; K., Ramalingam; A., Manohar; G., Bocelli; Righi, Lara. - In: ZEITSCHRIFT FÜR ANORGANISCHE UND ALLGEMEINE CHEMIE. - ISSN 0044-2313. - 628(2002), pp. 685-689.
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