Hydrothermal synthesis and characterization of two ammonium‐templated cobalt aluminophosphates

Two new cobalt-substituted aluminophosphates (CoAPOs) with ammonium cation-templates, (NH 4 ) 2 [(OH) 0.95 (H 2 O) 0.05 ] 2 [Co 0.05 Al 0.95 ] 2 (PO 4 ) 2 and (NH 4 )[(OH) 0.95 (H 2 O) 0.05 ][Co 0.025 Al 0.975 ] 2 ·2H 2 O, 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 Co 2+ substitutes for Al 3+ 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 NH 4 + -templates. The compounds are stable up to ca. 350 °C above which temperature they become amorphous.