2,4,6-TRICHLOROBENZOIC ACID - STRUCTURE AND HYDROGEN-BONDING PATTERN

This is an uncommon structure with Z = 12 in space group P2(1)/n. The three molecules of C7H3Cl3O2 in the asymmetric unit consist of one com plete carboxylic acid dimer at a general position and one-half of a se cond unique dimer located at a crystallographic inversion center. Each of the three acid molecules in the asymmetric unit displays carboxyl lengths and angles that are nearly equivalent to each other (as oppose d to the highly defined C=O and C-O distances, and C-C-O angles that o ccur in very ordered dimeric systems).