K. S. Asha, Rajeev Khoj, N. Ahmed
Feb 9, 2017
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Journal
Crystal Growth & Design
Abstract
The use of monocarboxylic acid along with dicarboxylic acid significantly influences the nucleation–growth– transformation process in crystals of metal–organic frameworks. Usually the acetic acid is used as a coordination modulator to control the morphology and size of crystals. We have explored here the effect of acetic acid on the structures where the secondary building unit is a trimer. The acetic acid binds with the metal ion and induces structural transformation with anisotropic crystal growth. The acetic acid bonded structures are found to have magnetic long-range ordering at low temperature. Moreover the bonding fashion of the acetate ion creates a chiral center in the framework due to spontaneous resolution of the achiral building units. We have proposed a possible mechanism for this acetic acid driven transformation by analyzing the powder X-ray diffraction patterns and single crystal structure. Thus, this work not only provides a strategy to synthesize new designed structures using mixed carboxy...