Molecular Chirality and Chiral Superlattice in Crystal of Tetrakis[(pyrrol-1-yl)methyl]methane
The crystal structure of tetrakis[(pyrrol-1-yl)methyl]methane was determined by X-ray diffraction measurement, and the result shows that it belongs to monoclinic crystal system, space group is P21/n, with a=0.9284(3) nm, b=1.0950(6) nm, c=1.8749(8) nm; α=γ= 90.00(4)°, β=103.63(3)°, V=1.8523(14) nm3, Z=4, ρcalcd.=1.192 kg/m3, μ=0.072 nm-1, F(000)=712, R1=0.0854, wR2=0.1884. It has been found that the molecules exist in two enantiomeric states. Enantioselective self-assemblies such as one-dimensional molecular stacks in a single handedness, homochiral monolayers and a chiral superlattice are specified in this racemic crystal. In addition, a simple technique is advocated to distinguish chiral states from tetrahedral molecules in the solid state. The present R/S nomenclature of the tetracooradinated carbon centers is used solely for its convenience to distinguish the two enantiomeric states, but not used to determine the absolute configurations.
作 者： XU Wei LU Yin-Xiang LIU Chun-ming LAN Bi-jian ZHOU Hui WANG Jing-mei 作者单位： XU Wei,LU Yin-Xiang,LIU Chun-ming,LAN Bi-jian,ZHOU Hui(Department of Materials Science, Fudan University, Shanghai 200433, P. R. China)WANG Jing-mei(Research Center for Analysis and Measurement, Fudan University, Shanghai 200433, P. R. China)
刊 名： 高等学校化学研究（英文版） ISTIC SCI 英文刊名： CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 年，卷(期)： 2004 20(6) 分类号： O6 关键词： Achiral molecule Racemic crystal Central chirality Enantioselective self-assembly Chiral superlattice