Abstract
C18H15OP.C8H6Cl2O3, M(r) = 499.3, triclinic, P1BAR, a = 8.539 (4), b = 15.564 (7), c = 18.768 (10) angstrom, alpha = 90.97 (3), beta = 95.25 (3), gamma = 102.24 (3)degrees, V = 2426 (2) angstrom3, Z = 4, D(x) = 1.367 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 0.36 mm-1, F(000) = 1032, T = 295 K, R = 0.037 for 2648 observed reflections. The compound was prepared by interacting 1:1 molar ratios of triphenylphosphine oxide and (3,4-dichlorophenoxy)acetic acid in toluene/ethanol and allowing the mixture to crystallize from the oil which resulted from evaporation of the solvent. The crystallographic repeating unit consists of two independent 1:1 molecular pairs. The two molecules of triphenylphosphine oxide and (3,4-dichlorophenoxy)acetic acid in each pair associate through single directed hydrogen bonds between the carboxylic acid group and the phosphoryl O atom [OH...O 2.60 (1), 2.61 (1) angstrom]. The independent molecules of triphenylphosphine oxide and (3,4-dichlorophenoxy)acetic acid are conformationally dissimilar.
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