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Amino Acid Derivatives of Layered Zirconium Phosphates – α‐Zirconium L‐(+)‐Serinephosphate and Zirconium L‐(+)‐Serinephosphate Phosphates
Author(s) -
Costantino Umberto,
Nocchetti Morena,
Marmottini Fabio,
Vivani Riccardo
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199810)1998:10<1447::aid-ejic1447>3.0.co;2-b
Subject(s) - chemistry , zirconium , thermogravimetric analysis , moiety , inorganic chemistry , zirconium phosphate , intercalation (chemistry) , monoclinic crystal system , infrared spectroscopy , thermal decomposition , crystallography , phosphate , stereochemistry , crystal structure , organic chemistry
A layered derivative of α‐zirconium phosphate containing L ‐(+)‐serine covalently attached to the inorganic layer has been prepared by allowing Zr fluoro complexes to decompose in the presence of L ‐(+)‐phosphoserine. On the basis of thermogravimetric weight loss and C,H,N elemental analyses, the layered compound obtained has been formulated as Zr[HOOCCH(NH 2 )CH 2 OPO 3 ] 2 . The X‐ray powder diffraction pattern has been indexed with a monoclinic cell ( a = 5.3737 Å, b = 9.3231 Å, c = 14.510 Å, β = 96.99°, Z = 2). FT‐IR absorption spectra show that the serine groups attached to the inorganic layers are present as zwitterions. Thermal decomposition commences at ca. 250 °C and occurs in two steps: the first is due to a decarboxylation reaction, with the formation of the amino derivative Zr(NH 2 CH 2 CH 2 OPO 3 ) 2 , while the second is associated with pyrolysis of the organic moiety, leading to ZrP 2 O 7 . Despite the presence of the amino acid function in the interlayer region, the compound does not show intercalation ability towards cations or anions or polar species. However, compounds with a certain degree of microporosity and possessing ion‐exchange and adsorption properties have been obtained by replacing some of the phosphoserine groups of the compound by HPO 4 groups, to produce the mixed layered derivatives Zr[HOOCCH(NH 2 )CH 2 OPO 3 ] 2– x ‐(HPO 4 ) x .