Abstract
2′,2′':6′',2‴-Terpyridyl complexes of mercury(II)halides, perchlorates and nitrates are reported, along with comparative observations on their zinc and cadmium analogs. Corresponding compounds of the three metals are isomorphous, so that terpyridyl brings their coordination behavior into line. The mercury halide complexes, HgX 2 terpy, are five-coordinate like the known zinc and cadmium counterparts. In the perchlorate complexes, [M(terpy) 2](ClO 4) 2, the metals are six-coordinate, assuming terpyridyl again to be tridentate. In the series M(NO 3) 2 terpy the nitrate is covalently bound. Metal-halogen and metal-ligand infrared frequencies are given and discussed.
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