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Figure 7
The relationship between photochromic properties and dihedral angles of SA derivatives. Each SA derivative corresponds to an open circle that indicates the photochromic property and the intramolecular dihedral angle between two benzene rings. The dihedral angles of SA derivative crystals are classified into photochromic (upper row) and non-photochromic (lower row) ones. Both types of photochromic and non-photochromic crystals are observed between 20 and 30°.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 3| May 2012| Pages 297-304
doi:10.1107/S0108768112010993
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