Fluorine-bridged linear interaction

Martin observed an extremely facile thermal decomposition of bisperester 53, which gave 54 (Scheme 7).74 The decomposition proceeds via a transition state 55, with the simultaneous participation of the cr (0 O)—np(S)—a (0-0) type.74 The transition state can be draw by the 5c 6e interaction. Alvalez discussed the structure and the stability of Br42, together with neutral Br4.lla The dianion could be analyzed by the 4c 6e model, if the four atoms align linearly with suitable distances. Farnham investigated the fluorine-bridged linear C-I- -F- I C interaction based on 5c-6e.llb... 

Of a large number of possible interactions for the [XeF]- -[MFg]- pair it seemed most probable that the interaction would keep the xenon(ii) atom two co-ordinate and that the positive xenon atom in [XeF]+ would interact with a relatively electron-rich duorine ligand of [MF,] . It was also assumed that the bridging fluorine atoms would form a linear or near linear -F------Xe — F group (as in XeFj and [XegFa] ). It was con-... 

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