VARIABLE-TEMPERATURE C-13 SOLID-STATE NMR-SPECTRA - MOBILITY OF TRIMETHYLTIN GROUPS IN COORDINATION POLYMERS OF THE TYPE [(ME3SN)4M(CN)6]INFINITY (M=FE, OS, RU)
Rk. Harris et al., VARIABLE-TEMPERATURE C-13 SOLID-STATE NMR-SPECTRA - MOBILITY OF TRIMETHYLTIN GROUPS IN COORDINATION POLYMERS OF THE TYPE [(ME3SN)4M(CN)6]INFINITY (M=FE, OS, RU), Spectrochimica acta. Part A: Molecular spectroscopy, 50(12), 1994, pp. 2069-2078
Solid-state C-13 CP MAS NMR studies of compounds [(Me3Sn)4M(CN)6]infin
ity with M=Fe, Ru and Os were performed over a temperature range of 80
K in order to understand exchange thermodynamics. For each compound s
ix methyl carbon signals are seen below 240 K, showing there are two n
on-equivalent Me3Sn units. Using detailed lineshape analysis the therm
odynamic activation parameters for the three samples were obtained. Lo
w-temperature 2-D exchange spectra indicated that exchange occurs betw
een the carbons of each Me3Sn rotor independently. Therefore in the ca
lculations a model of two independent three-site mutual-exchange proce
sses was used. The effect of Sn-117/Sn-119 satellites was included.