Dynamic NMR investigations of fluxionality of 2-(dimethoxymethyl)pyridine and 2,6-bis(dimethoxymethyl)pyridine in rhenium(I) and platinum(IV) complexes
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Abstract
The ‡ (298.15 K) for the fluxions were in the range 59–85 kJ mol−1 with the order being ReI–L1 > ReI–L2 > PtIV–L1. A carbon–carbon bond rotation mechanism is proposed for the fluxions in the L1 complexes and concerted C–C bond rotation/metallotropic shift processes for the L2 complexes. Crystal structures of [ReCl(CO)3L1] and [PtIMe3L1] revealed distorted octahedral metal centres with N–M–O ‘bite’ angles of 73–75° and a trans relationship of the axial