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A new Cu/Zn carboxylato-bridged 1D polymer: Direct synthesis, X-ray structure and magnetic properties |
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| Authors: | Elena A Buvaylo Volodymyr N Kokozay Brian W Skelton Andrew Ozarowski |
| Institution: | a Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Str. 64, Kyiv 01033, Ukraine b Chemistry, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, Crawley, Western Australia 6009, Australia c Faculty of Chemistry, University of Wroclaw, 14 Joliot-Curie Str., 50-383 Wroclaw, Poland d National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, United States |
| Abstract: | A new complex Cu2Zn(O2CMe)6(NH3)2]n was isolated as an unexpected product in an open-air synthesis of a mixed-metal compound using zero-valent copper, zinc oxide and ammonium acetate in the presence of 2-diethylaminoethanol in acetonitrile solution. Its structure consists of Cu2(O2CMe)4 units situated on crystallographic inversion centres and Zn(NH3)2(O2CMe)2 units on crystallographic 2-fold axes. One O atom of each of the O2CMe groups is attached via Zn bridges to the Cu atoms of the dimeric Cu2(O2CMe)4 unit forming a 1D polymer in the bc direction. The polymer is not linear, with the dihedral angles between successive Cu-Cu vectors being 48.9°. Within the Cu2(O2CMe)4 units the Cu···Cu distance is 2.675(2) Å and the angles between the O2CMe planes are 88.8(5)°. The magnetic properties have been analyzed using the Hamiltonian ? = J?1?2 with J = 286 cm−1 and g = 2.13. High-field EPR spectra showed both the exchange-coupled copper pair and non-interacting copper(II) ions. The presence of the latter species was explained as an effect of zinc atoms occupying a fraction of the copper sites. |
| Keywords: | 1D polymer Exchange interactions High-field EPR Crystal structure Zero-valent copper |
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