Abstract
In this article, gas inclusion phenomena for a flexible single-crystal host have been described. The synthesized single crystal hosts exhibit high flexibility and adjustability for the properties of adsorbed guests to realize the highly ordered gas inclusion state. Because the crystal remains intact under gas adsorption state, it is possible to analyze the resulting host-guest aggregate in great and accurate details by conventional single-crystal X-ray diffraction. Here, the relationship between incorporated gaseous guest and walls of pores cannot be compared to the contact between a ball and a flat surface, but to the atomic contact of a point (atom) to a point (atom), raising the necessity of regarding a gas adsorption state as a co-crystal state. The study of flexible single-crystal host system will contribute to clarify the mechanism of dynamic adsorption to develop the new functions from the view point of the host-guest chemistry. Furthermore, the homogeneity, anisotropy, integrity, transparency, etc. of crystal hosts would contribute to the advancing of new techniques for future society.
