4-Tritylbenzoic acid. A molecular scaffold for wheel-and-axle host–guest inclusion compounds with a supramolecular axis
4-Tritylbenzoic acid. A molecular scaffold for wheel-and-axle host–guest inclusion compounds with a supramolecular axis
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4-三苯甲基苯甲酸。具有超分子轴的轮轴主客体包合物的分子支架。
DOI：
10.1039/a909827e
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Nangia
中科院分区：
文献类型：
--
作者：
R. K. Jetti;F. Xue;T. Mak;A. Nangia
4-三甲基苯甲酸通过羧基二聚体超分子合成子结晶生成轮轴主体晶格，在其微孔框架中包括不同的芳香族溶剂。用单晶X射线衍射法对包合物结构进行了表征。二甲苯、氯苯和苯甲醚等溶剂以2：1的主-客体化学计量比包含在横截面区域42 A2的通道中，而均三甲苯以1：1的包合物占据71 A2的通道。主机架构是健壮的，但也具有适应性。羧基二聚体合成子与苯基相互作用(边对面，EF和偏移面对面，关)一起产生轮轴超分子的重复的锯齿形磁带。带内和带间区域中过多的芳香EF和OFF基序调节空腔区域以适应不同大小/形状的溶剂。在这种同构结构家族中，能够调整孔隙体积并仍然保持目标轮轴拓扑是一个显著的特征。非溶剂酸采用不同的晶体填充，三苯甲基填充结构中的空位。
4-Tritylbenzoic acid crystallises via the carboxy dimer supramolecular synthon to produce a wheel-and-axle host lattice that includes different aromatic solvents in its microporous framework. The clathrate structures were characterised by single crystal X-ray diffraction. Solvents like xylenes, chlorobenzene and anisole are included in a channel of cross-sectional area 42 A2 with 2∶1 host–guest stoichiometry while mesitylene occupies a channel of 71 A2 as a 1∶1 clathrate. The host architecture is robust and yet adaptive. The carboxy dimer synthon together with the phenyl–phenyl interactions (edge-to-face, ef and offset face-to-face, off) produce recurring, zigzag tapes of wheel-and-axle supermolecules. A plethora of aromatic ef and off motifs in the intra- and inter-tape regions modulate the cavity area to accommodate solvents of different size/shape. The ability to tune the pore volume and still retain the target wheel-and-axle topology is a notable feature in this family of isomorphous structures. The unsolvated acid adopts a different crystal packing with the triphenylmethyl groups filling the voids in the structure.