Abstract
The complexes trans-[RuX2{Ph2Sb(CH2)3SbPh2}2] (X = Cl, Br or I) have been prepared from [Ru(dmf)6][CF3SO3]3, LiX and the distibine (dmf = dimethylformamide), and characterised by chemical analysis and UV/VIS spectroscopy. They are oxidised by HNO3 in HBF4 solution to trans-[RuX2{Ph2Sb(CH2)3SbPh2}2]BF4. The latter have been characterised by similar techniques, and the RuII–RuIII redox potentials established electrochemically. The crystal structures of Ph2Sb(CH2)3SbPh2 and trans-[RuBr2{Ph2Sb(CH2)3SbPh2}2]·2CH2Cl2 [Ru–Sb 2.5758(5), 2.6043(8); Ru–Br 2.5770(7) A] have been determined. Using data from the Cambridge Crystallographic Database on transition metal SbPh3 complexes, the present complexes, and those of Ph2SbCH2SbPh2, the effect of co-ordination on the C–Sb–C angles and the Sb–C distances has been examined. A correlation of increased C–Sb–C angles with decreased Sb–C distances is observed on co-ordination.
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