包接化合物の分子認識と結晶化挙動

概要

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Molecular recognition and cystallization processes are investigated using nickel complex (NI-complex) as a host, and 1-and 2-methylnaphthalene as guests. Information of clathrate crystals, guest molecules are recognized by a host with characteristic host-guest interaction in solutions and/or on the growing surface of the crystals, then the guest molecules are included in the host lattice. Such molecular recognition and integration of host-guest structure are performed through the nucleation and crystal growth processes. In this work it was observed that the species crystallizing out (polymorphs) and selection of guest molecule are mainly determined by nucleation process and the behaviors are strongly influenced by the condition of the circumstance, i. e. temperature and guest molecular concentration in solutions. On the other hand, the transformation proceeds between the polymorphous clathrate crystals, accompanying the exchange of guest molecules due to the difference of thermodynamic stability of the crystals. The mechanism of the competitive crystallization and the transformation of polymorphs could be explained quantitatively by estimating the supersaturation degree of each polymorph and the thermodynamic stability of the host lattice structure, from the solubility of each host lattice of the polymorphs.
日本結晶成長学会の論文
1995-03-25