Solvothermal synthesis, structure and magnetic properties of heterometallic coordination polymers based on a phenolato-oxamato co-bidentate-tridentate ligand

Abstract

First examples of 1D oxamate-based coordination polymers obtained solvothermally.

Solvothermal Synthesis, Temperature-Dependent Structural Study, and Magnetic Characterization of a Multipolydentate Oxamate-Based 2D Coordination Network

“…For example, the use of amino acid based oxamate ligands gives access to new porous frameworks with remarkable properties. − On the other hand, phenolic and benzoic derivatives of the oxamate ligands seem to pose a greater synthetic challenge for the observation of fully coordinating ligands and/or the preparation of heterometallic systems. − Following our work on the 2-hydroxyphenyloxamate ligand under bench conditions, we had investigated solvothermal conditions to succeed in crystallizing copper­(II)-based heterobimetallic compounds. This proved efficient with both the 2-hydroxyphenyloxamate and the 2-carboxyphenyloxamate, yet only 1D coordination polymers were obtained. , To increase the dimensionality of our edifices, we have naturally moved to a para -substitued phenyloxamate, and started to investigate the 4-(ethyloxamate)­benzoic acid, H 2 Et-paba. We present here its use in solvothermal conditions and in the presence of copper­(II) to prepare the heterobimetallic (TMA) 3 [CuMn­(paba) 2 (OAc)]·8H 2 O ( 1 ) 2D coordination network.…”

“…This proved efficient with both the 2-hydroxyphenyloxamate and the 2-carboxyphenyloxamate, yet only 1D coordination polymers were obtained. 30,31 To increase the dimensionality of our edifices, we have naturally moved to a para-substitued phenyloxamate, and started to investigate the 4-(ethyloxamate)benzoic acid, H 2 Et-paba. We present here its use in solvothermal conditions and in the presence of copper(II) to prepare the heterobimetallic (TMA) 3 the general procedure for oxamate ligand, 32 which differs from the previously reported synthesis.…”