A dynamic NMR study of 1,2-metallotropic shifts in trimethylplatinum(IV) halide complexes fo 3-METHYLPYRIDAZINE (cas 1632-76-4)

Add time:07/26/2019    Source:sciencedirect.com

3-Methylpyridazine (3-Mepydz) reacts with halogenotrimethylplatinum(IV), [PtXMe3)4], to afford complexes of type fac-[PtXMe3(3-Mepydz)2] (X = Cl, Br or I). In solution these complexes undergo 1,2-metallotropic shifts between the contiguous nitrogen donors producing different linkage isomers. Solution abundances of these ismers are strongly influenced by the steric effects of the 3-methyl group on the pyridazine ring, with the (1,1)-isomer always being predominant (≈ 95%). Activation energies for the fluxion were determined by variable temperature 1H NMR spectroscopy, values of the (1,1) → (1,2) isomer shift being in the range 74–78 kJ mol−1.

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