Molecular gyroscopes: [Fe(CO)(3)] and [Fe(CO)(2)(NO)](+) rotators encased in three-spoke stators; facile assembly by alkene metatheses.
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abstract
Complexes to toy with: Ring-closing metathesis of the bis(phosphane) complexes 1a-c (n = 4-6) followed by hydrogenation gives the "molecular gyroscopes" 2a-c. The crystal structure of 2c and the NMR data for the analogous {Fe(CO)2(NO)}+complex indicate facile rotation of the {Fe(CO)2(L)}m+moieties within the P(CH2)14P spokes. Shorter bridges as in 2a lock the rotators.