SYNTHESIS AND CRYSTAL-STRUCTURE OF BIS(META-AMINOBENZONITRILE)DIMERCURY(I)-DINITRATE

The structure of bis(m-aminobenzonitrile)dimercury(I) dinitrate, [Hg2(m-NH2C6H4CN)2](NO3)2 has been determined by single crystal X-ray diffraction techniques and refined to an R(w)-value of 0.022. The crystals are triclinic, space group P 1BAR with a = 5.4878(1) angstrom, b = 8.4085(1) angstrom, c = 9.6062(1) angstrom, alpha = 92.599(3)-degrees, beta = 94.763(3)-degrees, gamma = 89.614(3)-degrees and Z = 1. The Hg2(2+)-ion [Hg-Hg 2.524(1) angstrom] is approximately axially coordinated to amino nitrogen atoms [Hg-N 2.209(4) angstrom, Hg-Hg-N 169.5(3)-degrees]. Additional amino hydrogen bonds to oxygen are building chains along the b-axis containing units of L-Hg-Hg-L groups.