Issue 2, 1998

Unsymmetrically substituted pyrazolates: nickel(II) complexes of a novel dinucleating ligand providing both N- and S-rich co-ordination spheres

Abstract

An unsymmetric pyrazolate ligand with different chelating side arms in the 3 and 5 positions of the heterocycle {3-[(EtSCH2CH2)2NCH2]-5-[(Et2NCH2CH2)2NCH2]C3N2H2 (HL1)} and its symmetrical analogue {3,5-[(EtSCH2CH2)2NCH2]2C3N2H2(HL2)} have been prepared. Upon reaction with NiCl2·6H2O they afforded dinuclear complexes [Ni2L1Cl3] 2 and [Ni2L2Cl3] 1 that contain both a bridging pyrazolate and a bridging chlorine atom. While all nickel(II) ions within the N2S2 compartments of the primary ligands are six-co-ordinate, one of the amino side arms of L1 in the former complex is non-co-ordinating, leaving the respective nickel centre in a square-pyramidal environment. This dangling arm is co-ordinated to the metal ion upon treatment of 2 with NaBPh4 due to substitution of the terminal chlorine atom to form [Ni2L1Cl2][BPh4] 3. All new complexes were characterised by means of X-ray crystallography; 2 and 3 represent rare examples of dinuclear complexes exhibiting various kinds of asymmetry. The electrochemical and magnetic properties of the complexes are reported.

Supplementary files

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1998, 199-206

Unsymmetrically substituted pyrazolates: nickel(II) complexes of a novel dinucleating ligand providing both N- and S-rich co-ordination spheres

M. Konrad, F. Meyer, K. Heinze and L. Zsolnai, J. Chem. Soc., Dalton Trans., 1998, 199 DOI: 10.1039/A705543I

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