X-RAY STRUCTURE INVESTIGATIONS OF QUINONES - II

The largest class of structurally studied quinones-the benzoquinone de rivatives-consists of individual compounds (69 crystal structures), mo lecular complexes (49 crystal structures), and ionic salts (28 crystal structures). For these compounds, the site symmetry of a molecule in the crystal and the agreement factor of the structure determination ar e given. Based on the data available in the Cambridge Structural Datab ase and scientific journals, some of the most interesting characterist ics of molecular conformations, specific features of packings of the a cceptor and donor molecules in complexes, and geometric characteristic s of the anions in ionic salts are discussed.