Crystal Structure and Spectroscopic Studies of a New Organic Dihydrogenmonophosphate [2-NH<sub>2</sub>-6-CH<sub>3</sub>-C<sub>4</sub>H<sub>3</sub>N<sub>2</sub>O]<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>
作者:J. Oueslati、R. Kefi、F. Lefebvre、M. Rzaigui、C. Ben Nasr
DOI:10.1080/10426500802196794
日期:2009.2.3
Physicochemical properties of a new dihydrogenmonophosphate [2-NH2-6-CH3-C4H3N2O]2(H2PO4)2 are described on the basis of X-ray crystal structure investigation. This compound crystallizes in the triclinic space group P-1. The unit cell parameters are: a = 7.667(3) , b = 8.204(5) , c = 14.761(6) , = 98.85(4), = 99.23(3), = 90.50(4), V = 905.0 3, and Z = 2. The crystal structure was solved and refined to R = 0.037, using 4351 independent reflections. The atomic arrangement of this compound is built up by (H2PO4)nn - chains. Each chain aggregates with organic molecules to form an open framework architecture through hydrogen bond interactions. The structure includes four types of hydrogen bonds. The first one, OHO, links the H2PO4 groups to form (H2PO4)nn - infinite inorganic chains parallel to the a axis. The three other types, OHO(carbonylic), NHO(carbonylic), and NHO, assemble the inorganic chains so as to build up a three-dimensional arrangement. This compound has also been investigated by IR, and solid-state 13C and 31P MAS NMR spectroscopies combined to ab initio calculations.