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Two mercury(II) complexes containing imidazolidine-2-thione (Imt) and thiocyanate or cyanide ligands, [Hg(Imt) 2 (SCN) 2 ] ( 1 ) and [Hg(Imt) 2 (CN) 2 ] . Hg(CN) 2  ( 2 ), have been prepared and characterized by IR and NMR spectroscopy and X-ray crystallography. In compound  1 , the mercury atom is located on a two-fold rotation axis and is coordinated to two thione sulfur atoms of imidazolidine-2-thione (Imt) and to two sulfur atoms of thiocyanate in a distorted tetrahedral mode with the S-Hg-S bond angles in the range of 98.96(3)–148.65(6)°. In  2 , the mercury atom is hexa-coordinated having a distorted octahedral geometry composed of two cyanide C atoms [Hg-C=2.055(5) Å] and four weakly bound thione S atoms of imidazolidine-2-thione (Imt) [Hg-S=3.1301(13) and 3.1280(13) Å]. One free Hg(CN) 2  molecule is also present in the crystal. In both complexes, the molecular structure is stabilized by N-H…N and N-H…S hydrogen bonding interactions.

zeitschrift für naturforschung b

Synthesis and crystal structures of bis(imidazolidine-2-thione- κS )bis(thiocyanato- κS )mercury(II) and bis(cyanido)bis( μ 2  -imidazolidine-2-thione- κS )mercury(II).Hg(CN) 2