PREPARATION AND X-RAY CRYSTAL-STRUCTURE OF THE FIRST TRIMERIC NICKEL THIOSEMICARBAZONE COMPLEX - THE FIRST EXAMPLE ELF OLIGOMERIZATION BY BOTH NI-O-NI AND NI-S-NI BRIDGING

Monomeric nickel(II) thiosemicarbazone complexes are an attractive new class of homogeneous catalysts for the activation of silanes. However , their activity is limited by the formation of inactive oligo- and po lymers. The pathway by which aggregation takes place was elucidated by the preparation and X-ray structural analysis of the first trimeric n ickel(II) thiosemicarbazone complex. Aggregation was shown to proceed via Ni-O-Ni and Ni-S-Ni bridging, giving rise to both fourfold planar and pseudooctahedral coordination of the nickel ions.