Synthesis, and Crystal and Molecular Structure of Bis(N-methyl-formamide)tetrakis(thiocyanato)cobalt(II)mercury(II), CoHg(SCN)4(HCONHCH3)2

The title complex was synthesized and its crystal and molecular structure were determined by the single-crystal X-ray diffraction technique. The crystal is orthorhombic with a space group P21nb, a=14.953(4), b=15.955(4), c=7.6838(9) A. The crystal was solvent by means of the heavy-atom method and the final R value was 0.059. The mercury atom is in the tetrahedral geometry, coordinated with four sulfur atoms of the thiocyanate (SCN) ions, and the cobalt atoms is in the octahedral geometry, coordinated with four nitrogen atoms of SCN ion and two oxygen atoms of N-methylformamide which occupy the cis positions. Each pair of different kinds of metal atoms is bridged by an SCN ion and are in a three-dimensional network. Twenty-four membered rings of Co3Hg3(SCN)6, where the metal atoms are arranged hexagonally in a chair-form, are condensed two-dimensionally approximately parallel to the (100) plane. All mercury atoms on one plane are bridged by SCN ions to the cobalt atoms of the polymeric plane next to the [1...