Organically templated open-framework phosphites

Abstract

Here we present a summary of the work carried out in the last few years on the synthesis and characterization of a new type of organically templated inorganic-organic solid based on the (HPO 3 ) 2À phosphite oxoanion, with special focus on the magnetostructural properties of those systems containing open d-shell transition metal ions. As a result of the inherent connectivity of the metalphosphite framework, the magnetic behaviour of the great majority of these materials is characterized by weak antiferromagnetic interactions that become relevant only at low temperature.

Synthesis and structural characterization of two cobalt phosphites: 1-D (H3NC6H4NH3)Co(HPO3)2 and 2-D (NH4)2Co2(HPo3)3

“…Many complex structures are created by a hydrolysis-condensation of this parent chain. Few examples of compounds having such structures include some aluminum phosphates reported by Ozin's group [28], zinc phosphates reported by Rao's group, [2] and transition metal phosphites [8]. This twisted square chain has also been found in a known cobalt phosphate, (R, S)-(C 5 H 14 N 2 )Co(HPO 4 ) 2 (3), [29] in which (HPO 3 ) 2 À and (HPO 4 ) 2 À can be viewed as equivalent species.…”

“…However, cobalt has high coordination flexibility and a strong tendency to form edge-sharing or face-sharing linkages of metal-oxygen polyhedra. These properties usually lead to difficulty in mimicking a zeolitetype structure, but can lead to the possibility of new structural morphology and interesting magnetic properties [3][4][5][6][7][8]. Recently, the HPO 3 group has been investigated as a possible replacement for the tetrahedral HPO 4 unit with great success [9][10][11][12][13][14].…”

Synthesis and Characterization of an Inorganic‐Organic Hybrid Framework Phosphite Containing Infinite Edge‐Sharing Cobalt Chains

“…Over the past few decades, open‐framework metal phosphates have been extensively investigated due to their rich structural chemistry and potential applications in catalyses, separations, ion‐exchange, photoluminescence (PL), magnetism, and so forth 1–6. Currently, the pseudo pyramidal phosphite group HPO 3 has been researched with interest as a possible replacement for the traditional phosphate tetrahedron with great success 7–9. It can reduce the M –O–P connectivity and lead to the formation of novel structures with interrupted frameworks.…”

Solvent-free synthesis of new metal phosphites with double-layered, pillared-layered, and framework structures

“…Previously, several pillared layered structures, such as (VO) 4 (4,4 0 -bpy) 2 6 ]$3H 2 O contains cobalt phosphite layers with a kgm topology. Among these compounds, Co(O 3 PH) (4,4 0 -bpy) 0.5 (H 2 O) shares many common structural features with compound 2.…”