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Triphenylacetic acid is isomorphous with the published structure of triphenylchloromethane (I). It crystallizes in the trigonal system, space group P3, with a=b=14.105(3)A, c=13.121(2)A V=2261(1)A3, Z=6 at 175K. The structure was solved by direct methods and refined to R(F 0)=0.062. We determined the structures for two triclinic polymorphs of triphenylchloromethane, II and III. The three forms were obtained from pentane evaporated at room temperature. Phases I and III were isolated from particular solvent systems. Crystal data (II): triclinic system, space group P3, with a=13.028(1)A, b=13.559(2)A, c=13.969(3)A, α=117.67(1)°, β=92.67(1)°, γ=91.43(1)°, V=2179.9A3, Z=6 at 228K. The structure was solved by direct methods and refined to R(F 0)=0.045. Crystal data (III): triclinic system, space group P3, with a=14.1562(4)A, b=21.3190(7)A, c=13.0654(5)A, α=99.92(3)°, β=92.68(3)°, γ=106.15(2)°, V=3712(2)A3, Z=10 at 248K. The structure was solved by direct methods and refined to R(F o)=0.064. A batch of ... |
