Reactions of an antimony containing cage compound with metal carbonyls: synthesis and structural characterization of [{M(CO)5}2(η1:η1-P4Sb2C4But4)], M = Cr, Mo or W, and [{Fe(CO)4}2{Fe(CO)3(η3:η1-P4Sb2C4But4)}]
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David E. Hibbs, Michael B. Hursthouse, Cameron Jones and Ryan C. Thomas
Abstract
The antimony containing cage compound, P4Sb2C4But4, was treated with an excess of [M(CO)5(THF![[hair space]](https://www.rsc.org/images/entities/char_200a.gif)
)], M = Cr, Mo or W, to produce the 2∶1 adduct complexes, [{M(CO)5}2(η1∶η1-P4Sb2C4But4)], which X-ray crystallographic studies have shown to contain one M(CO)5 fragment co-ordinated to an unsaturated phosphorus centre and one co-ordinated to an antimony centre. In contrast, its reaction with an excess of [Fe2(CO)9] produced [{Fe(CO)4}2{Fe(CO)3(η3∶η1-P4Sb2C4But4)}], which is probably formed by the insertion of an Fe(CO)3 fragment into an Sb–P bond of the cage. Its crystal structure confirms that it contains two η1-co-ordinated Fe(CO)4 groups and a 1,3-diphosphaallyl fragment η3 co-ordinated to an Fe(CO)3 moiety.