ORGANIC CRYSTAL MATERIAL COMPOSED OF MOLECULAR FRAME COMPRISING CRYSTAL IN WHICH π-ELECTRON SYSTEM UNIAXIALLY ROTATES, AND CONTROL METHOD OF BIREFRINGENCE

摘要

PROBLEM TO BE SOLVED: To provide an organic crystal material that has a fixed composition of substances and yet changes the degree of birefringence depending on a temperature or the like, a novel organic crystal material that allows design of a desired optically characteristic material without changing the thickness thereof and attains an arbitrary birefringence value by continuously changing a molecular movement mode of a partial structure of a molecule inside the organic crystal, and a controlling method of birefringence using the organic crystal material.

SOLUTION: The organic crystal material is composed of a crystal of a molecular frame represented by formula (I) and shows continuous changes of birefringence by heat. In the formula, E1is a group 14 atom such as a silicon atom or the like; A is a bivalent aromatic group such as a phenylene group or the like; and n is an integer of 6-12.

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