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DOI: 10.1039/A904587B (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 2679-2682

Hydrothermal synthesis and characterization of two ammonium-templated cobalt aluminophosphates

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Ranko P. Bontchev and Slavi C. Sevov

Abstract

Two new cobalt-substituted aluminophosphates (CoAPOs) with ammonium cation-templates, (NH4)2[(OH)0.95(H2O)0.05]2[Co0.05Al0.95]2(PO4)2 and (NH4)[(OH)0.95(H2O)0.05][Co0.025Al0.975]2·2H2O, have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, thermogravimetry, elemental analysis, mass spectrometry and IR spectroscopy. The first compound crystallizes in a new zeolite-like structure type where Co2+ substitutes for Al3+ at both trigonal bipyramidal and octahedral sites. The second CoAPO is isostructural with a known aluminophosphate, AlPO-15, where all metal sites are octahedrally coordinated. The channels in both compounds are occupied by the charge-balancing NH4+-templates. The compounds are stable up to ca. 350[thin space (1/6-em)]°C above which temperature they become amorphous.

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