Synthesis and Structural Studies of the Metal(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

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Abstract
Complexes of the type MHg(SCN)4•2L, where M = Mn2+ to Zn2+ and Cd2+ and L = THF or Py, have been synthesized and characterized by spectroscopic methods. The thiocyanato groups are bridging between M2+ and Hg2+ whereas the donor atom of the ligand is coordinated to M2+ which now attains octahedral configuration. Definite shifts in certain absorption bands of the ligands upon coordination to M2+ are correlated to the formation constant of the metal atom involved in coordination. Electronic spectral data as well as magnetic measurements show that the M2+ is a high spin species in an octahedral environment. The X-ray powder photographs indicate that Co2+ and Zn2+ complexes are isostructural and also most probably are Mn2+ and Fe2+. Tentative assignments for metal–NCS, M–ligand, Hg—S, and L—M—L absorption bands are discussed.

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