Ethene-Trans Dihydrogenphosphite and Dihydrogenphosphate Compounds Exhibiting Cooperative and Directed Hydrogen Bonds Between Cations and Anions: H2bpe(H2PO3)2 and H2bpe(H2PO4)2·H2O

Abstract

H<inf>2</inf>bpe(H<inf>2</inf>PO<inf>3</inf>)<inf>2</inf> (1) and H <inf>2</inf>bpe(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O (2) (H<inf>2</inf>bpe = ethene-trans-1,2-bis(4-pyridinium), H<inf>2</inf>PO <inf>3</inf> = dihydrogenphosphite, and H<inf>2</inf>PO<inf>4</inf> = dihydrogenphosphate) have been prepared and structurally characterized. In compound 1, the dihydrogenphosphite anions form dimers, with a P⋯P distance of 4.2073(7) Å, by two O-H⋯H hydrogen bonds, and the dimeric dihydrogenphosphite units interact with the H<inf>2</inf>bpe cations by way of N-H⋯O and O-H⋯O hydrogen bonds, resulting in a one-dimensional chain. The chains are held together by C-H⋯O interactions. In compound 2, the phosphate ions are connected by O-H⋯O hydrogen bonds into an unusual 2D square grid-type framework with P⋯P separations ranging from 4.7533(7) to 4.9506(8) Å. The H<inf>2</inf>bpe cations crosslink the dihydrogen phosphate layers by N-H⋯O hydrogen bonds, forming a three-dimensional supramolecular network with channels. The water molecules in compound 2 occupy these channels and make O-H⋯O bonds to adjacent phosphate O atoms and also O-H⋯O bonds to the next water O atom in the channel. © 2006 Verlag der Zeitschrift für Naturforschung.