Comment on “Insight into the reversible structural crystalline-state transformation from MIL-53(Al) to MIL-68(Al)” by A. Perea-Cachero, E. Romero, C. Téllez and J. Coronas, CrystEngComm, 2018, 20, 402†
Abstract
In a recently published communication (CrystEngComm, 2018, 20, 402–406), Perea-Cachero et al. stated that the topologically isomeric metal–organic frameworks MIL-53(Al) and MIL-68(Al) could be reversibly transformed into each other. However, the suggested synthesis procedure for MIL-68 indeed resulted in MIL-53 with DMF entrapped inside of the pores. The collected PXRD pattern of MIL-53DMF was then inadvertently assigned to the MIL-68 structure.