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Structural investigation of di-m-chloro-bis[saccharinatopyridinemercury(II)] by X-ray diffraction and FT IR spectroscopy

The solid state structure of the title compound was determined and the appropriate assignment of the CO and SO_2 stretching vibrations in the FT IR spectrum was made. Two monomeric chlorosaccharinatopyridinemercury(II) moieties are joined together forming a di-m-chloro bridged dimmer by an operation of the inversion centre. The mercury atom is coordinated with two bridging chlorine and the pyridine and the saccharinato nitrogen atoms in form of a heavily distorted tetrahedron. There is significant difference between Hg1-Cl1 [2.533(2) A] and Hg1-Cl1* [2.715(2) A] distances as well as between Hg1-N11 [2.106(7) A] and Hg1-N21 [2.209(7) A] bond lengths. The valence bond angles at the metal atom deviate significantly from the standard tetrahedral value ranging from 86.23(7)^o for Cl1-Hg1-Cl1* to 131.5(3)^o for N11-Hg1-N21. The discrete molecules are linked together with weak intermolecular C-H^.^.^.O attractions at distances less than 3.5 A.

chloromercury(II) saccharinate; pyridine adduct; X-ray structure determination; FT IR spectroscopy

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