文摘
Mobility of N,N-dimethylformamide (dmf) molecules in a homochiral metal鈥搊rganic framework [Zn2(bdc)(S-lac)(dmf)]路dmf (bdc = 1,4-benzenedicarboxylate; S-lac = L-(鈭?-lactate) has been studied using 13C, 1H, and 2H solid-state NMR and DSC experiments. The compound exhibits a phase transition in the vicinity of 240 K, associated with disordering of the dmf molecules. In the high-temperature phase, the dmf molecules undergo intense diffusion accompanied by the exchange between the molecules coordinated with Zn and guest molecules in the framework pores. The activation energy of the molecular migration including exchange between coordinated and guest molecules was estimated to be 37 kJ/mol.