Carcinogenesis, Vol 19, 1641-1648, Copyright © 1998 by Oxford University Press
AK Katz, HL Carrell and JP Glusker
The molecular dimensions of the potent chemical carcinogen
dibenzo[def,p]chrysene, also known as dibenzo[a,l]pyrene, have been
determined by X-ray diffraction methods. This analysis shows that the
molecule is considerably distorted so that it is non-planar with an angle
of 27.6 degrees between the outermost rings and a widening of C-C- C bond
angles in the fjord region. The dimensions of the molecular distortion due
to atomic overcrowding in the fjord region are presented. This polycyclic
aromatic hydrocarbon is a more potent carcinogen than is benzo[a]pyrene or
its 11-methyl derivative. Comparisons of the distortions in
dibenzo[a,l]pyrene with the geometries of various other polycyclic aromatic
hydrocarbons containing fjord- or bay-region methyl groups provide
structural data on the ratio of angular to torsional distortion in such
overcrowded molecules.
ARTICLES
Dibenzo[a,l]pyrene (dibenzo[def,p]chrysene): fjord-region distortions
The Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
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