Abstract
A new Co(II) phosphonate, Co(H2O)2PO3C–C12H9·H2O, has been synthesized under hydrothermal conditions. The monoclinic P21/c structure of this organic–inorganic hybrid consists of isolated perovskite-type chains of corner-shared CoO4(H2O)2 octahedra interconnected via phosphonate groups. The unique one-dimensional structure of this phase is closely related to the single-chain magnet (SCM) phosphonate Co(H2L)(H2O), with L = 4-Me-C6H4-CH2N(CPO3H2)2, that contains isolated chains of CoO5N octahedra. Like the latter, this hybrid exhibits 1D antiferromagnetic interactions and the possibility of an effective pseudo spin contribution due to spin canting at low temperature, but, in contrast, is not an SCM. This different magnetic behavior is explained by the different geometry of the octahedral chains and by the possible existence of weak antiferromagnetic interactions between the chains. This opens the route to the investigation of a large series of compounds by tuning the chemical composition and structure of the phosphonic acid used as organic precursor of hybrid materials.
Highlights
We show that the latter exhibits antiferromagnetic interactions phosphonate Co(H2O)2PO3C–C12H9·H2O, whose structure, built up of CoO4(H2O)2 octahedra, of cobalt phosphonates prepared from 9-fluorenylphosphonic acid
A unique one-dimensional cobalt phosphonate that exhibits isolated perovskite-type chains of corner-sharing CoO4(H2O)2 octahedra was synthesized. The structure of this phosphonate is closely corner-sharing CoO4 (H2 O)2 octahedra was synthesized. The structure of this phosphonate is closely related to that of the compound Co(H2L)(H2O), with L = 4-Me-C6H4-CH2N(CPO3H2)2, which related to that of the compound Co(H2 L)(H2 O), with L = 4-Me-C6 H4 -CH2 N(CPO3 H2 )2, which consists of chains of corner-sharing Co5N octahedra
The magnetic behavior of this phase consists of chains of corner-sharing Co5 N octahedra
Summary
Metal phosphonates represent a very large family that has been the object of numerous investigations [1] in view of various applications such as ion exchange properties [2], catalysis [3,4,5,6,7], luminescence [8,9,10], protonic conduction [11,12,13,14], or as a reservoir of bio-active metal ions [15,16]. REVIEW of 11is phosphonates involving isolated infinite of corner-shared cobalt CoX6 octahedra onlyhybrid cobalt phosphonate to date that exhibits such achains structural behavior [29,30]. Be a single-chain magnet a magnetic has been objectconsists of numerous hybrid phosphonates involving isolated infinite chains of corner-shared cobalt CoX6 octahedra is. Co(II) phosphonates structural behavior it the has investigation been shown to a single-chain magnet (SCM), a. Mind control of the between them, we have embarked the exploration of cobalt that large molecular ligands in the phosphonate groups should allow the formation of isolated phosphonates is a challenging direction for the research of new magnetic properties. Antiferromagnetic interactions and intra-chain spin canting, but, in spite of its structure closely
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