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Cluster based copper(II)-azide polymer: Synthesis,structure and magnetic study
Authors:Sandip Saha  Debabrata Biswas  Partha Pratim Chakrabarty  Atish Dipankar Jana  Athanassios K. Boudalis  Saikat Kumar Seth  Tanusree Kar
Affiliation:1. Department of Chemistry, Acharya Prafulla Chandra College, New Barrackpur, Kolkata 700 131, India;2. Department of Physics, Behala College, Parnashree, Kolkata 700 060, India;3. Institute of Materials Science, NCSR “Demokritos”, 153 10, Aghia Paraskevi Attikis, Greece;4. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India;5. Department of Physics, M.G. Mahavidyalaya, Bhupatinagar, Midnapore(E), West Bengal 721425, India
Abstract:
The reaction of ethylene diamine with Cu(NO3)2·3H2O and an excess of NaN3 (1:2:4 molar ratio) lead to the formation of copper-azido based polymer [Cu4(N3)8(en)2]n (1), which has been successfully characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction and variable temperature magnetic study. X-ray crystal structure determination of 1 reveals that the structure consists of 1D chains of a centrosymmetric tetranuclear copper(II)-azido cluster, connected through double azido end-to-end bridges. Variable-temperature magnetic studies (between 2 and 300 K) suggest dominant antiferromagnetic interactions in this complex, although ferromagnetic interactions have been observed in all other copper-azido based polymers produced with ethylene diamine reported so far.
Keywords:Ethylene diamine   Azides   Copper(II)   1D coordination polymers   Crystal structure   Magnetic properties
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