Abstract
A large number of SbCl 5·L adducts were synthesized (L = RCN, R 3− n R′ n PO, ethers and various other oxygen donors). The adducts can be assigned to the C 4 v point group according to the infrared and Raman spectra of both the solids and the solutions in dibromethane. Antimony-121 NMR was used to monitor the extent of auto-ionisation due to reaction: 2SbCl 5·L ⇌ SbCl 4·2L + + SbCl 6 −. This increases with the polarity of the solvent and the donor strength of the ligand, but was always less than 3%. 1H and 13C{ 1H} NMR were used to establish the relative stability constants of the series of adducts in dichloromethane. A linear correlation of slope near unity is observed between the relative free energy of formation and Gutmann's donor number. A correlation is found between the adduct stabilities and the various metal—chloride stretching frequencies.
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