O. Grupce et al., Structural investigation of di-mu-chloro-bis[saccharinatopyridinemercury(II)] by X-ray diffraction and FT IR spectroscopy, CROAT CHEM, 72(2-3), 1999, pp. 465-476
The solid state structure of [C12H9ClHgN2O3S](2) Was determined and the app
ropriate assignment of the CO and SO2 stretching vibrations in the FT IR sp
ectrum was made. Two monomeric chlorosaccharinatopyridinemercury(II) moieti
es are joined together forming a di-mu-chloro bridged dimmer by an inversio
n centre operation. The mercury atom is coordinated with two bridging chlor
ine and the pyridine and saccharinato nitrogen atoms in the shape of a heav
ily distorted tetrahedron. There is a significant difference between Hg1-Cl
1 [2.533(2) Angstrom] and Hg1-Cl1(i) [2.715(2) Angstrom] distances as well
as between Hg1-N11 [2.106(7) Angstrom] and Hg1-N21 [2.209(7) Angstrom] bond
lengths. The valence bond angles at the metal atom deviate significantly f
rom the standard tetrahedral value, ranging from 86.23(7)degrees for Cl1-Hg
1-Cl1(i) to 131.5(3)degrees for N11-Hg1-N21. Discrete molecules are linked
together by weak intermolecular C-H...O attractions at distances less than
3.5 Angstrom.