论文信息 - Crystal Structures of Chiral Smectogenic 4-Pentyloxyphenyl and 4-Heptyloxyphenyl 4′-[(S)-2-Methylbutyl]biphenyl-4-carboxylates

Crystal Structures of Chiral Smectogenic 4-Pentyloxyphenyl and 4-Heptyloxyphenyl 4′-[(S)-2-Methylbutyl]biphenyl-4-carboxylates

Crystal structures of the title compounds, which have a Sm* C phase adjacent to a cholesteric, have been determined by single crystal X-ray analysis. 4-Pentyloxyphenyl 4′-[(S)-2-methylbutyl]biphenyl-4-carboxylate: monoclinic, P21, a=25.085(2), b=5.7522(3), c=18.668(1) A, β=110.275(9)°, Z=4. 4-Heptyloxyphenyl 4′-[(S)-2-methylbutyl]biphenyl-4-carboxylate: triclinic, P1, a=14.607(1), b=17.212(2), c=5.7322(8) A, α=94.84(1), β=84.03(1), γ=108.607(9)°, Z=2. Final R-values were 0.113 and 0.083, respectively. Both crystals have layer structures similar to those of Sm* C phase. Two crystallographically independent molecules in each crystal are related by a pseudo-inversion. Paraffin chains with extended conformations have close contacts between layers.

Y. Ohashi | K. Hori

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