Electron structure changes of SbCl5 on its complexation have been inve
stigated by X-ray fluorescence spectroscopy and compared with correspo
nding earlier data for SnCl4L2 and TiCl4L2 complexes. X-ray spectral d
ata analysis against the data of the heat of formation of the complexe
s, Mossbauer effect parameters, derivatographic data, and the valence
vibration frequences have permitted an assessment of the complex stabi
lity against different factors and have proved donor electron density
transfer from the donor to the acceptor to be small. It has been shown
that the donor charge effect consists mainly of the acceptor bond pol
arization. (C) 1998 John Wiley & Sons, Inc.