Variable-temperature 13C solid-state NMR spectra: Mobility of trimethyltin groups in coordination polymers of the type [(Me3Sn)4M(CN)6]∞ (MFe, Os, Ru)

Abstract

Solid-state ¹³C CP MAS NMR studies of compounds [(Me₃Sn)₄M(CN)₆]∞ with MFe, Ru and Os were performed over a temperature range of 80 K in order to understand exchange thermodynamics. For each compound six methyl carbon signals are seen below 240 K, showing there are two non-equivalent Me₃Sn units. Using detailed lineshape analysis the thermodynamic activation parameters for the three samples were obtained. Low-temperature 2-D exchange spectra indicated that exchange occurs between the carbons of each Me₃Sn rotor independently. Therefore in the calculations a model of two independent three-site mutual-exchange processes was used. The effect of ^117/119Sn satellites was included.