Structures of 2-pyridineformamide thiosemicarbazone and its complexes withcadmium halides

Citation
A. Castineiras et al., Structures of 2-pyridineformamide thiosemicarbazone and its complexes withcadmium halides, POLYHEDRON, 19(15), 2000, pp. 1873-1880
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
POLYHEDRON
ISSN journal
0277-5387 → ACNP
Volume
19
Issue
15
Year of publication
2000
Pages
1873 - 1880
Database
ISI
SICI code
0277-5387(20000730)19:15<1873:SO2TAI>2.0.ZU;2-8
Abstract
Reduction of 2-cyanopyridine by sodium in dry methanol in the presence of t hiosemicarbazide produces 2-pyridineformamide thiosemicarbazone, HAm4DH. Co mplexes of HAm4DH with cadmium(II) chloride, bromide and iodide have been p repared and spectroscopically characterized, and crystal structures of [Cd( HAm4DH)Cl-2]. DMSO. [Cd(HAm4DH)Br-2]. H2O and [Cd(HAm4DH)I-2] have been det ermined by X-ray diffractometry. In each of these complexes neutral HAm4DH coordinates via its pyridyl and imine nitrogens and sulfur, and the cadmium atom is pentacoordinated to the thiosemicarbazone and the two halo ligands . The coordination polyhedra of the three complexes are best described as s quare pyramidal, with [Cd(HAm4DH)Br-2] having the greatest distortion towar d a trigonal bipyramid. The hydrogens attached to nitrogens in coordinated HAm4DH form hydrogen bonds with oxygen atoms in solvent molecules and with halo ligands on adjacent molecules. (C) 2000 Elsevier Science Ltd. All righ ts reserved.