STUDY OF CHARGES ON HETEROATOMS IN ORGANIC-COMPOUNDS OF THE 2ND-ROW ELEMENTS BY X-RAY-FLUORESCENCE SPECTROSCOPY .12. COMPLEXES OF ANTIMONY PENTACHLORIDE

The characteristic features of the electronic structure of SbCl(5)L co mplexes has been studied in comparison with those of the SnCl(4)L(2) a nd TiCl(4)L(2) complexes. Tile results of X-ray structural analysis we re correlated with the heats of complexation, tile data of Mossbauer s pectroscopy, derivatography, quantum-chemical PM3 calculations, and st retching frequencies of the donor-acceptor bonds. Based on these data, tile contributions of different effects to tile stabilities of comple xes were determined, complexation enthalpies previously unknown were c alculated, and a conclusion was drawn that the electron density transf er from the donor to the acceptor is small. Tile charge effect of tile donor consists primarily in polarization of tile acceptor bonds; this polarization decreases as a result of tile change in the geometry of the acceptor upon complexation. The relative stabilities of the comple xes with dimethyl sulfide were determined using a unique internal stan dard technique.