Abstract
Trigonal bipyramidal complexes [NiX(QL)][BPh 4] (X=Cl and I; QL=( o-Ph 2P . C 6H 4) 3P, ( o-Ph 2P . C 6H 4) 3)As, ( o-Ph 2P . C 6H 4) 3Sb, ( o-Ph 2As - C 6H 4) 3P, ( o-Ph 2As . C 6H 4) 3)As, and ( o-Ph 2AS . C 6H 4) 3Sb) were prepared and their electronic spectra examined. It is shown that a change of apical donor atom of the organic ligand gives the following anomalous spectrochemical order: P>As⪡Sb. This effect is attributed to compression of the apical bond caused by chelation.
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