Synthesis and characterization of metal carboxyalkylphosphonates hybrid materials Academic Article uri icon

abstract

  • Several carboxyalkylphosphonate hybrid materials have been prepared under hydrothermal conditions: Mn2(OH)(O3PCH2CO 2)·1/2H2O, Mn2(OH)(O3PCH 2CO2), Al3(OH)3(O 3PCH2CH2CO2)2· 3H2O, Pb5(O3PCH2CH 2CO2)2(O3PCH2CH 2COOH)2 and Pb3(O3PCH 2CH2CO2)2. The influence of some variables in the syntheses such as pH or metal/phosphonic acid molar ratios have been examined. Mn2(OH)(O3PCH2CO 2)·1/2H2O crystallizes in a triclinic cell with parameters a=8.405 Å, b=8.789 Å, c=4.910 Å, α=90.71°, β=98.58°, γ=103.68°and V=348.6 Å3. Its dehydration lead to Mn2(OH)(O 3PCH2CO2), which unit cell has also been determined: a=8.307 Å, b=8.322 Å, c=4.940 Å, α=103.31°, β=98.81°, γ=80.79°and V=325.6 Å3. The diffraction data suggest a layered structure. Al 3(OH)3(O3PCH2CH2CO 2)2·3H2O crystallizes in a monoclinic unit cell with a=10.534 Å, b=7.880 Å, c=10.320 Å, β=109.86°and V=805.7 Å3. Its X-ray powder pattern and the spectroscopic data are consistent with a pillared layered structure. Finally, Pb5(O3PCH2CH2CO 2)2(O3PCH2CH2COOH) 2 is monoclinic with a=11.889(1) Å, b=12.746(1) Å, c=9.835(1) Å, β=114.081(2)°, V=1360.6(2) Å3, Z=2, space group P21/c. Its structure has been solved from single crystal data, R1=0.069, and shows a pillared layered framework. There are two types of carboxyethylphosphonate chains, one being protonated which is pillaring the layers and the other chain is twisted and bonded to a unique inorganic layer through both carboxylate and phosphonate moieties. Thermal and IR data for these compounds are reported and discussed. © 2004 Elsevier SAS. All rights reserved.

author list (cited authors)

  • Gómez-Alcántara, M. M., Cabeza, A., Aranda, M., Guagliardi, A., Mao, J. G., & Clearfield, A.

citation count

  • 38

publication date

  • May 2004