Two phosphate-imidazole complexes with and without a hydrogen-bonded guest molecule

Abstract

The molecular structures of the complexes imidazolium 6,6′-di-tert- butyl-4,4′-dimethyl-2,2′-thiodiphenyl phosphate, C3H 5N2+·C22H28O 4PS-, (I), and imidazolium 6,6′-di-tertbutyl-4, 4′-dimethyl-2,2′-thiodiphenyl phosphate diisopropyl hydrazodicarboxylate hemisolvate, C3H5N2+·C22H28O4PS -·-0.5C8H16N2O4, (II), have been determined. While (I) forms the expected hydrogen-bonded chain utilizing the two imidazole N-bound H atoms, in (II), the substituted hydrazine solvent molecule inserts itself between the chains. Compound (I) exhibits a strong N-H-⋯O hydrogen bond, with an N⋯O distance of 2.603 (2) Å. The hydrazine solvent molecule in (II) lies about a twofold axis and the N-bound H atoms are involved in bifurcated hydrogen bonds with phosphate O atoms. A C-bound H atom of the imidazolium cation is involved in a C-H⋯O interaction with a carbonyl O atom of the hydrazine solvent molecule. © 2005 International Union of Crystallography.