Conformational polymorphism of oligothiophenes: X-ray structure of the monoclinic form of 3,3',4'',3'''-tetrakis(methylsulfanyl)-2,2':5',2'':5'',2'''-quaterthiophene

被引:27
作者
Barbarella, G
Zambianchi, M
Marimon, MDI
Antolini, L
Bongini, A
机构
[1] UNIV MODENA,DIPARTIMENTO CHIM,I-41100 MODENA,ITALY
[2] UNIV BOLOGNA,DIPARTIMENTO CHIM G CIAMICIAN,I-40126 BOLOGNA,ITALY
关键词
D O I
10.1002/adma.19970090606
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Conformational polymorphism of an oligothiophene, the title compound (T4S), is reported for the first time. Efficient synthesis of T4S produced, in addition to the triclinic, deep orange crystals reported previously, a second (yellow monoclinic) form of T4S. whose structure as revealed by single-crystal X-ray diffraction is presented here. The synthetic pathway is outlined and the molecular structure and crystal packing are dis cussed. The significantly different pi-delocalization in the two conformations indicates the need for very careful molecular characterization.
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页码:484 / &
页数:5
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