Other Fluorophosphine Complexes

The known fluorophosphine-borane adducts are listed in Table VIII. Trifluorophosphine-borane can be made directly from diborane and excess trifluorophosphine (255) or by displacement of carbon monoxide from BHa CO (255), which it closely resembles. 

The strueture of PFs-BHs has been recently established by micro-wave studies on several isotopic species The shortening of 0.032 A 

Trifluorophosphine-borane has also been prepared in the gas phase reaction between boroxine and trifluorophosphine, but the method is somewhat hazardous and probably best carried out with small amounts of material 16). Kinetic studies indicate a first-order dependence on the 

Complex Melting point (°C) Boiling point (°C/mm) Refs. 

BH3PF3 and oxygen react in the gas phase to form H2B2O3, hydrogen, trifluorophosphine, and B2O3 16). 

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Clark and co-workers have shown that trifluorophosphine can replace all the CO groups from certain metal carbonyl complexes (56, 58, 59). Other fluorophosphines behave similarly, the reactions usually being thermally or photochemically induced (320, 57, 121, 284, 287, 61). In the case of HCo(CO)4, however, substitution by PFg occurs rapidly and spontaneously even at —20°C (320). 

From Other Fluorophosphine-Transition Metal Complexes... 

Fluorophosphines are tervalent phosphorus compounds containing phosphorus-fluorine bonds and they often show markedly different chemical behavior compared with other halogenophosphines. This article is mainly concerned with recent advances in the chemistry of derivatives of PF 3 of the type PF3 X , with particular reference to (a) synthesis of new structural types, (6) the role of fluorophosphines as ligands, particularly in transition metal complexes, and (c) nuclear magnetic resonance (NMR) studies. 

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