Uptake of amino-acids by zirconium phosphate. Part 3. Intercalation ofL-histidine,L-lysine, andL-aginine by γ-zirconium phosphate
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 61-65
- https://doi.org/10.1039/dt9860000061
Abstract
The uptake of L-histidine (His), L-lysine, and L-arginine by γ-zirconium phosphate has been studied. The intercalation of His is initiated by the partial replacement of interlayer water by a monolayer of the guest molecules oriented horizontally to the sheet of the host crystal to form a phase Zr(HPO4)2(His)0.2·1.9H2O with an interlayer spacing of 14.1 Å. This is followed by the formation of a phase Zr(HPO4)2(His)0.4·0.8H2O without any appreciable change in interlayer spacing, which is finally converted into a phase Zr(HPO4)2(His)0.9·3H2O with an interlayer spacing of 22.9 Å in which the guest molecules are intercalated as a bilayer. Lysine and arginine also form one or two monolayered phases at low uptakes, while at higher loadings the intercalates formed are highly disordered, but with a certain degree of order in the host lattice. The different behaviour of α- and γ-zirconium phosphates in intercalating amino acid molecules is discussed in terms of the structural or functional characteristics of the individual acids and phosphates. A supplementary discussion of the amino acid arrangement in α-zirconium phosphate is also made.This publication has 0 references indexed in Scilit: