Syntheses and Structures of Organically Templated Iron Phosphates

Abstract

Iron phosphates are of interest because of rich crystal chemistry and practical applications. New crystalline iron phosphates have been prepared in aqueous or predominantly nonaqueous solvents under mild hydrothermal conditions using organic amines as structure-directing agents. The effects of pH, solvent, and temperature on the reaction products are discussed. FePOs have been prepared with 1-D chain, 2-D layered, and 3-D open framework structures. An FePO containing a chiral amine is also synthesized. This review will summarize some of the results of the work in the area of organically templated iron phosphates.

Open-Framework Inorganic Materials

“…[179] Other oxyfluorinated compounds followed, but the first all-oxide homologues were synthesized in 1997 in the group of Lii in Taiwan. [180] A complete description of these oxidic phases is given elsewhere [180] and will not be discussed here. However, we would like to draw attention to the building units that often appear in these phases.…”

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C10N4H28][{FeF(OH)(HAsO4)}4], with a Layer Structure

“…Thus, a large number of iron phosphates with novel structures have been prepared and characterized. [2,3] Most of these iron phosphates have been prepared by employing hydrothermal methods. In some cases HF was used as the mineralizer, which also becomes part of the structure by linking the metal centers.…”

Synthesis of Open-Framework Iron Phosphates, [C6N2H14][FeIII2F2(HPO4)2(H2PO4)2]·2H2O and [C6N2H14]2[FeIII3(OH)F3(PO4)(HPO4)2]2·H2O, with One- and Three-Dimensional Structures

“…We have employed similar approaches for the preparation of novel iron phosphates forming new materials with open architectures (7b, 7c). In continuation of this theme, we have been investigating the formation of iron phosphates using iron acetylacetonate, [Fe(acac) ], as the starting source for iron in the presence of 1,4-diazabicyclo [2,2,2]octane (DABCO) employing hydrothermal methods. In this paper, we report the synthesis and structural characterization of two new iron phosphates,…”