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Selenium-77 NMR of coordination compounds with unsaturated selenium ligands and/or selenium (II) central ions

✍ Scribed by Wolfgang Dietzsch; Ruth-Maria Olk; Eberhard Hoyer; Wolfgang Meiler; Wolfgang Robien

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 423 KB
Volume: 26
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260260803

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✦ Synopsis

77Se NMR spectra of coordination compounds containing unsaturated dithio, thioseleno or diseleno ligands are reported. Ni", Zn", Se" and Te" were used as central ions. The shielding of the Se donor atoms of the same ligands depends on the central ion, following the series Se" < Zn" < Te" < Ni". 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 Ni" complex {Ni[SezC=C(CN)2]2)2-and the octahedral Nil" complex {Ni[Se,C=C(CN),],)Z-differ by 265 ppm. The most downfield shifts of all the investigated compounds were found for donor atoms in 1,Zdiselenolene compounds. KEY WORDS "Se NMR Coordination compounds Unsaturated selenium ligands Selenium(I1) central ions

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