Nuclearity Control in Molecular Copper Phosphates Derived from a Bulky Arylphosphate: Synthesis,Structural and Magnetic Studies |
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| Authors: | Dr Tulasi Prapakaran Dr C I Sathish Prof Jiabao Yi Prof Ajayan Vinu Prof Ramaswamy Murugavel |
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| Institution: | 1. Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076 India;2. Global Innovative Center for Advanced Nanomaterials, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308 NSW, Australia |
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| Abstract: | Starting from sterically encumbered 2,6-di-tert-butylphenyl phosphate (dtbppH2) and co-ligand 3,5-dimethyl pyrazole (dmpz), it is possible to isolate either mono-, di- or tetranuclear copper phosphates by varying the copper source and making attendant changes in the reaction conditions. For example, reaction of copper nitrate with dtbppH2 and dmpz at 60 °C leads to the isolation of the mononuclear copper phosphate Cu(dtbppH)2(dmpz)(MeOH)2] ( 1 ) as the only product. However, the use of copper acetate in place of copper nitrate and conducting the reaction at the room temperature leads to the formation of both dinuclear Cu(dtbpp)(dmpz)2]2 ( 2 ) and tetranuclear Cu2(dtbpp)(dmpz)2(OAc)(MeO)]2 ( 3 ) from the same reaction mixture. Compounds 2 and 3 could be isolated in pure form through fractional crystallization. Copper phosphates 1 – 3 have been characterized by both analytical and spectroscopic methods including EPR and magnetic measurements. The molecular structures of all three compounds were established through single crystal diffraction studies. Dc magnetic measurements indicate antiferromagnetic interactions between the metal centres in all the compounds. |
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| Keywords: | Antiferromagnetic interaction Bulky phosphate Copper phosphate EPR Magnetism |
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