Croatica Chemica Acta, Vol. 62 No. 3, 1989.
Original scientific paper
Effect of the Orientational Disorder on the Observed Geometry of Carboxylic Group in Dimers of Carboxylic Acids in Crystalline State
Slawomir J. Grabowski
; Institute of Chemistry, Bialystok Branch of the Warsaw University, 15-443 Bialystok, AL 1 Maja 11/4, Poland
Tadeusz M. Krygowski
; Institute of Chemistry, Bialystok Branch of the Warsaw University, 15-443 Bialystok, AL 1 Maja 11/4, Poland
Abstract
Joint considerations of twofold symmetry axes producing various
orientations of carboxylic groups and of non-coplanarity of
these groups in a dimer lead to a new classification of orientational
disorder in crystal s of cyclic dimers of carboxylic acids.
Analysis of the geometry and particularly of the anisotropic
thermal parameters of carboxylic atoms allows one to distinguish
between the possible types of orientational disorder. Influences of
dynamic disorder and mesomeric effects are discussed as well.
Keywords
Hrčak ID:
175808
URI
Publication date:
10.10.1989.
Visits: 787 *