Electron density redistribution on complexation in non-transition element complexes
摘要:
Complexes of tin, antimony, silicon, germanium, iodine, boron and titanium halogenides with organic ligands were investigated using nuclear quadrupole resonance (NQR) and X-ray fluorescence spectroscopies, and Mossbauer effect and quantum-chemical calculations. A discussion of results which we obtained previously as well as literature data is included. The correlations between Cl-35 NQR and ClKalpha line shifts in SnCl4L2, SbCl5L and TiCl4L2 complexes were obtained. The geometry of the acceptor was found to influence the value of the effective charge on the chlorine atom (q(Cl)) in SnCl4L2 complexes, but not to influence the chlorine atom in TiCl4L2 complexes. Values of q(Sn) and q(Sb) were calculated from Mossbauer isomer shifts in the SnCl4L2 and SbCl5L complexes. Electron-density transfer from the ligand to the vacant d orbital of the central atom on complexation was observed.
Tetrachloro (NN-dimethylformamide) (dimethylsulphoxide) TIN (IV) revisited
作者:J.D. Tornero、V. Fernandez、D. Tudela
DOI:10.1016/0022-2860(86)85231-0
日期:1986.3
Abstract The previously reported mixed ligand compound SnCl 4 (DMF) (DMSO) (DMF=NN-Dimethylformamide, DMSO=Dimethylsulphoxide) has been studied by IR, Raman and Mossbauer spectroscopy. Our results confirm its homogeneity with the DMF and DMSO ligands coordinating in cis position through the oxygen atoms. The compound does not isomerize when heated to 135 C, but decomposes giving rise to cis-SnCl 4