The use of trans-4-cotininecarboxylate to construct a polymeric copper(II) azido complex: Hydro(solvo)thermal synthesis, structure and magnetic properties |
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| Authors: | Feng Luo Ming-biao Luo |
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| Institution: | a Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense, East China Institute of Technology, Fuzhou, 344000 Jiangxi, China
b Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, MO 65409-0010, USA |
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| Abstract: | A new pyridyl-carboxylate ligand, the anion of trans-4-cotininecarboxylic acid, HL, 1, has been used to prepare a new polymeric copper(II) complex, CuLN3]2n, 2, based on a CuLN3]2 dimeric building block. The single crystal structures of both 1 and 2 have been determined and 1 has been found to be in its zwitterionic configuration. The structure of 2 is a one-dimensional tape-like polymeric structure based on an end-on azido-bridged binuclear Cu2N3]2 backbone moiety. Magnetic studies reveal that 2 is close to paramagnetic from 2 to 300 K with a Curie constant of 1.094 emu K/mol, a Weiss temperature of 0.73 K and a corresponding μeff of 2.09 μB. A fit of χMT for 2 with S1 = S2 = ½, yields g = 2.441(6), J = −0.49(3) cm−1, zJ = −0.38(2) cm−1 and N(α) = 0.00053(12) emu/mol, a fit that indicates the presence of both very weak intramolecular intrachain antiferromagnetic exchange coupling within the one-dimensional tape-like chains and very weak interchain antiferromagnetic exchange coupling between these chains. |
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| Keywords: | Copper(II) magnetic properties Magnetic exchange interactions Polymeric copper(II) complex |
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