External anion effect on the synthesis of new MOFs based on formate and a twisted divergent ligands

• Microwave synthesis of coordination polymers.
• Anion-derived structural changes.
• Influence of anions at different metal/anion ratios on the final architectures.
• EPR and magnetic characterization of a MOF compound.

New copper(II) metal–organic compounds with the formulae [Cu3Cl(HCO2)5(SCS)3(H2O)2]·8H2O·EtOH (1) and [Cu3(HCO2)4(SCS)4(H2O)2](NO3)2·9H2O (2) (SCS=bis(4-pyridylthio)methane) have been synthesized after a careful study of the reaction of the SCS ligand with copper(II) formate. The compounds were obtained in the presence of sodium chloride and nitrate salts under microwave irradiation. The influence of the anion at different metal/anion ratios on the final architecture has been studied. The new chloride-MOF 1 has been characterized by electron paramagnetic resonance (EPR), magnetic properties and single crystal X-ray diffraction studies. The thermal stability and topological analysis have also been investigated.

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