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Conformational polymorphism of oligothiophenes: X‐ray structure of the monoclinic form of 3, 3′, 4″, 3″′‐Tetrakis(methylsulfany‐l)2, 2′:5′, 2″:5″, 2″′‐Quaterthiophene
Author(s) -
Barbarella Giovanna,
Zambianchi Massimo,
del Fresno I Marimon Montserrat,
Antolini Luciano,
Bongini Alessandro
Publication year - 1997
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19970090606
Subject(s) - monoclinic crystal system , triclinic crystal system , delocalized electron , crystallography , polymorphism (computer science) , materials science , crystal structure , diffraction , x ray crystallography , chemistry , organic chemistry , optics , biochemistry , physics , genotype , gene
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 discussed. The significantly different π‐delocalization in the two conformations indicates the need for very careful molecular characterization.