The synthesis and characterisation of a number of new coordination compounds of Pt n and Pd n with the nitrogen donor ligand pyrazole (PzH) is described. These compounds are cis-Pt(PzH)2X 2, trans-Pt(PzH)eX2, Pt(PzH)aXe'n H,O (n = 0 or 1), Pd(PzH)aX2 and Pt(PzH)4PtCl4 where X = C1, Br and I. cis-Pd(PzH)2X2 compounds could not be obtained: trans-Pd(PzH)xX2 compounds seem to exist in more than one crystal form.The new compounds were characterised by chemical analyses, x-ray powder diffraction, i.r. and far-i.r, and by IH n.m.r, spectroscopy. The metal(lI) ions are in all cases coordinated in a square planar geometry.
Coordination compounds having the general formula ML2Ox are described, with Ox = oxalato dianion; M = Ni, Co and Zn; 1. = water and imidazoles. The compounds are * ,-\uth~r to x~hom all correspondence should be addressed. characterised by chemical analyses, i.r., far-i.r., Raman, ligand field and e.s.r, spectra. Magnetic susceptibility measurements at low temperatures indicate a polymeric structure of anti-ferromagnetically coupled M 2. ions.All physical measurements agree with a polymeric structure built up by oxalate ions as tetradentate bridging ligands forming one-dimensional linear chains. F.ach metal ion is Transition Met. Chem. 3, 90-98 (1978) Polymeric Coordination Compounds of Nickel (IlL Cobalt(ll) and Zinc(ll) 91 coordinated by four oxalate oxygens and two donor atoms (N or O) in distorted octahedron. For M = Ni, the magnetic susceptibility measurements can be best described with the Heisenberg model including a zero-field splitting; for M = Co, the lsing model gives the best results. The exchange coupling constants, l J I, vary from 9-13 cm -t .
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