Abstract

The crystal structures of the compounds [M(NMTP)] 4 (BF 4 ) 2 (M=Zn 2+ , Ni 2+ ; NMTP=N-methyl-2-thioxopyrrolidine) are reported. Whereas the zinc(II) complex has a nearly regular tetrahedral geometry, the nickel(II) complex is significantly distorted in the manner predicted by the Jahn-Teller theorem, with trans-SNiS angles decreasing from the tetrahedral value of 109.5 to 85 o . Metal-ligand bonding parameters have been derived from an analysis of the optical spectrum of [Ni(NMTP)] 4 (BF 4 ) 2

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