ISSN:
0192-8651
Schlagwort(e):
Chemistry
;
Theoretical, Physical and Computational Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Informatik
Notizen:
The configurational isomers of 2,5-dimethoxy-1,4-bis-[2-(2,4-dimethoxyphenyl)ethenyl]benzene have been investigated by ab initio (4-21G level) and MOPAC-AM1 semiempirical methods. The calculations were guided by and compared with single crystal X-ray results of the trans,trans-isomer determined at 298 K and 103 K. The barriers of rotation of the latter isomer in the free and the solid state were enumerated. A comparison with related molecules, in particular 1,4-bis[2-(3,4,5-trimethoxyphenyl)ethenyl]benzene, is made. The positioning of substituents is shown to be of importance for ring rotational movements and NMR shifts, as well as for UV /Vis spectroscopy. © 1996 by John Wiley & Sons, Inc.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/jcc.3