Crystal-structure studies of 4-phenylpiperazin-1-ium 4-ethoxybenzoate monohydrate, 4-phenylpiperazin-1-ium 4-methoxybenzoate monohydrate, 4-phenylpiperazin-1-ium 4-methylbenzoate monohydrate and 4-phenylpiperazin-1-ium trifluoroacetate 0.12-hydrate

Abstract

In this study, four new piperazinium salts, namely, 4-phenylpiperazin-1-ium 4ethoxybenzoate monohydrate, C9H9O3.C10H15N2.H2O(I); 4-phenylpiperazin-1ium 4-methoxybenzoate monohydrate, C10H15N2.C8H7O3.H2O(II); 4-phenylpiperazin-1-ium 4-methylbenzoate monohydrate, C10H15N2.C8H7O2.H2O(III); and 4-phenylpiperazin-1-ium trifluoroacetate 0.12 hydrate, C10H15N2.C2F3O20.12H2O(IV), have been synthesized. The single-crystal structures of these compounds reveal that all of them crystallize in the triclinic P1space group and the crystal packing of (I)–(III) is built up of ribbons formed by a combination of hydrogen bonds of type N—HO, O—HO and other weak interactions of type C—HOand C—H,leading to a three-dimensional network. In the crystal of (IV), the cations and the anions are connected by C—HO, N— HOandC—HFhydrogen bonds and by C—Hinteractions, forming sheets which in turn interact to maintain the crystal structure by linking through the oxygen atoms of water molecules and van der Waals interactions, giving the whole structure.