Synthesis, characterisation and study of mercury(II) bromide complexes with triphenylphosphine and heterocyclic thiones. The crystal structures of [bis(triphenylphosphine) dibromo mercury(II)] and [dibromo (pyrimidine-2-thionato) (triphenylphosphine) mercury(II)]. Extended intra-molecular linkages via N-H center dot center dot center dot Br and C-H center dot center dot center dot Br interactions

 
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2001 (EN)
Synthesis, characterisation and study of mercury(II) bromide complexes with triphenylphosphine and heterocyclic thiones. The crystal structures of [bis(triphenylphosphine) dibromo mercury(II)] and [dibromo (pyrimidine-2-thionato) (triphenylphosphine) mercury(II)]. Extended intra-molecular linkages via N-H center dot center dot center dot Br and C-H center dot center dot center dot Br interactions (EN)

Kubicki, M. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Kubicki, M. (EN)

Fractional crystallisation of the mixture, resulting from the direct reaction of mercury(IT) bromide with triphenylphosphine (PPh3) and pyrimidine-2-thione (pmtH), gives crystals of [HgBr2(PPh3)(2)] (1) and [HgBr2(PPh3)(pmtH)] (2). The complexes have been characterised by their elemental analyses, melting points and their FT-IR, far-IR, and UV-Vis spectroscopic data. The crystal structures of both [bis(triphenylphosphine) dibromo mercury(II)] (1) and [dibromo (pyrimidine-2-thionato)(triphenylphosphine) mercury(II)] (2) complexes have been established by single crystal X-ray crystallography at room temperature. Molecule 1 is monomeric with tetrahedral geometry around the metal ion. Two bromide atoms are co-ordinated to the mercury(II) ion [Hg(1)- Br(1) = 2.627(2) and Hg(1)-Br(2) = 2.6368(14) Angstrom] while two triphenylphosphine molecules are also co-ordinated to the metal ion via their phosphorus atoms with Hg(1)-P(1) and Hg(1)-P(2) bond distances of 2.550(4) and 2.491(5) Angstrom. respectively. The complex is covalent in the solid state. The unit cell of 2 consists of a molecule with tetrahedral geometry around the mercury(II) ion. A triphenylphosphine ligand and a pyrimidine-2-thione molecule are co-ordinated to the metal ion through their phosphorus and sulfur atoms with Hg(1)-P(1) and Hg(1) S(2) bond lengths of 2.450(2) and 2.4795(19) respectively. Two bromide atoms are also co-ordinated to the mercury ion [Hg(1)-Br(1) = 2.7065(10) and Hg(1)-Br(2) 2.6997(II) Angstrom]. The entire complex is covalent in the solid state. Extended intra-molecular linkages via N-H . . . Br interactions lead to a polymeric structure. Extended C-H . . . Br contacts link the alternate parallel chains forming a supramolecular assembly. (C) 2001 Elsevier Science Ltd. All rights reserved. (EN)

mercury(ii) complexes (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Polyhedron (EN)

English

2001

<Go to ISI>://000170124400012

Pergamon-Elsevier (EN)



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