ISSN:
0749-1581
Keywords:
77Se NMR
;
Coordination compounds
;
Unsaturated selenium ligands
;
Selenium(II) central ions
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
77Se NMR spectra of coordination compounds containing unsaturated dithio, thioseleno or diseleno ligands are reported. NiII, ZnII, SeII and TeII were used as central ions. The shielding of the Se donor atoms of the same ligands depends on the central ion, following the series SeII 〈 ZnII 〈 TeII 〈 NiII. The greater is the concentration of selenium atoms in the coordination sphere of identical central ions, the more their signals are shifted to lower field. Comparisons are made between mixed ligand complexes and the corresponding selenium containing parent compounds.The chemical shifts found for the selenium donor atoms in the planar NiII complex {Ni[Se2 C=C(CN)2]2}2- and the octahedral NiIV complex {Ni[Se2C=C(CN)2]3}2- differ by 265 ppm. The most downfield shifts of all the investigated compounds were found for donor atoms in 1,2-diselenolene compounds.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260260803
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