Unprecedented Mn(II)–Phosphate 3D Coordination Polymer with Novel pkb1 Topological Network Showing Spin-Canted Antiferromagnetism

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doi:10.1071/CH12073

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Unprecedented Mn(II)–Phosphate 3D Coordination Polymer with Novel pkb1 Topological Network Showing Spin-Canted Antiferromagnetism

Musheer Ahmad ^A, Manish K. Sharma ^A, Ruchi Singh ^A, Jerzy Mrozinski ^B and Parimal K. Bharadwaj ^A ^C

^A Department of Chemistry, Indian Institute of Technology Kanpur, 208016, India.
^B Faculty of Chemistry, University of Wroclaw, 50-383 Wrocław, Poland.
^C Corresponding author. Email: pkb@iitk.ac.in

Australian Journal of Chemistry 65(9) 1285-1290 http://dx.doi.org/10.1071/CH12073
Submitted: 3 February 2012 Accepted: 6 March 2012 Published: 14 May 2012





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Abstract

A novel Mn(II)phosphate coordination polymer, {Mn_2.5(HPO₄PO₄)H₂O)₂}_n, has been synthesized under solvothermal conditions. This is the first phosphate-based Mn(II) complex, which is obtained in excellent yield without using any external organic amine as a structure directing agent. The complex has a 3D non-interpenetrated unprecedented 5-nodal (5,5,6,6,7)-connected pkb1 topological network. It has been characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis (CHN analyzer and energy-dispersive X-ray spectroscopy), and thermogravimetry. Variable temperature magnetic susceptibility measurements indicate that the complex exhibits spin-canted antiferromagnetic behaviour at low temperature. The electron paramagnetic resonance measurements, at ambient and at low temperature, of the complex are also consistent with magnetic behaviour.

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