Structural properties of a series of photochromic fluorinated indolylfulgides.

Fluorinated indolylfulgides are a class of photochromic organic compounds that meet many of the requirements for use as optical memory media and optical switches. The X-ray crystal structures of a series of five photochromic fluorinated indolylfulgides have been determined, namely (3Z)-3-[1-(1,2-dimethyl-1H-indol-3-yl)-2,2,2-trifluoroethylidene]-4-(1-methylethylidene)dihydrofuran-2,5-dione (trifluoromethylisopropylideneindolylfulgide), C(19)H(16)F(3)NO(3), (I), (3Z)-3-[1-(1,2-dimethyl-1H-indol-3-yl)-2,2,3,3,3-pentafluoropropylidene]-4-(1-methylethylidene)dihydrofuran-2,5-dione (pentafluoroethylisopropylideneindolylfulgide), C(20)H(16)F(5)NO(3), (II), (3Z)-3-[1-(1,2-dimethyl-1H-indol-3-yl)-2,2,3,3,4,4,4-heptafluorobutylidene]-4-(1-methylethylidene)dihydrofuran-2,5-dione (heptafluoropropylisopropylideneindolylfulgide), C(21)H(16)F(7)NO(3), (III), (3Z)-3-[1-(1,2-dimethyl-1H-indol-3-yl)-2,2,2-trifluoroethylidene]-4-(tricyclo[3.3.

Investigations of the Copper Bromide-2,2'-Dipyridyl System: Hydrothermal Synthesis and Structural Characterization of Molecular Cu(3)Br(4)(C(10)H(8)N(2))(2), One-Dimensional CuBr(2)(C(10)H(8)N(2)), and Two-Dimensional [Cu(2)(OH)(2)(C(10)H(8)N(2))(2)][Cu(4)Br(6)].

The hydrothermal reactions of CuBr(2), CuBr, and 2,2'-dipyridyl have resulted in the synthesis of three new compounds. Cu(3)Br(4)(C(10)H(8)N(2))(2) (1) is a molecular phase; CuBr(2)(C(10)H(8)N(2)) (2) is a one-dimensional chain structure; and [Cu(2)(OH)(2)(C(10)H(8)N(2))(2)][Cu(4)Br(6)] (3) crystallizes in a two-dimensional sheet structure. All three compounds were characterized by single-crystal X-ray diffraction.