A New Inorganic-Organic Hybrid Zinc Phosphate Prepared with L-Histidine with an Unusual Stability in Water

作者：Mekhatria Djilali; Rigolet Severinne; Janiak Christoph; Simon Masseron Angelique^*; Hasnaoui Mohammed Abdelkrim; Bengueddach Abdelkader

来源：Crystal Growth & Design, 2011, 11(2): 396-404.

DOI：10.1021/cg100952q

A new layered zinc phosphate (Mu-39) has been synthesized by hydrothermal treatment with biomolecules as original templates. It was synthesized with the L-histidine amino acid (C(6)H(9)N(3)O(2)). The structure was determined by a single crystal X-ray diffraction study combined with exhaustive solid-state NMR experiments. These last ones [(1)H -> (13)C HETCOR, (1)H single quantum/double quantum (DQ), (31)P, (1)H -> (31)P CPMAS, (1)H -> (31)P HETCOR] ascertained the formulation of Mu-39 as {[C(6)H(10)N(3)O(2)(+)][Zn(2)(HPO(4))(PO(4))(-)]center dot H(2)O}(n) with a hydrogen phosphate and phosphate ligands, and ruled out partial protonation such as (H(1-x)PO(4))(H(x)PO(4)). A (31)P magic angle spinning (MAS) NMR study supported the almost complete racemization of L-histidine during the hydrothermal synthesis with only a small enantiomeric excess of 25% remaining. The compound crystallizes in the triclinic symmetry (space group P (1) over bar) with a = 8.6109(6) angstrom, b = 9.0319(6) angstrom, c = 9.9523(7) angstrom, and alpha = 84.481(2)degrees, beta = 83.279(2)degrees, gamma = 74.652(2)degrees, V = 739.56(9) angstrom(3), Z = 2. The inorganic layer is built up from four-membered rings sharing T-O-T bonds (T = Zn and P) and connected to each other in order to form ladders which are joined together via a Zn-O-P bond for creating eight-membered rings. The interest and the originality of this new zinc phosphate come especially from its unusual stability in aqueous solution.

• 出版日期2011-2