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Synthesis and characterization of μ‐oxamido copper(II)‐iron(II) heterobinuclear complexes with an antiferromagnetic exchange interaction
Author(s) -
Yan CuiWei,
Li YanTuan,
Liao DaiZheng
Publication year - 1997
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19970150604
Subject(s) - chemistry , antiferromagnetism , molar conductivity , copper , crystallography , octahedron , magnetic susceptibility , metal , ion , magnetic moment , exchange interaction , inorganic chemistry , condensed matter physics , crystal structure , ferromagnetism , physics , organic chemistry
Four new μ‐oxamido heterobinuclear complexes have been synthesized and identified as [Cu(oxap)Fe(L) 2 ]SO 4 , where oxap denotes the N , N' ‐bis(2‐aminopropyl)oxamido dianion and L represents diaminoethane (en); 1,3‐diaminopropane (pn); 1,2‐diaminopropane (ap) and 2,9‐dimethyl‐l,10‐phenanthroline (Me 2 ‐phen). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido‐bridged structures consisting of a copper(II) and an iron(II) ions, which have a square planar environment and an octahedral environment, respectively, are proposed for these complexes. Complexes [Cu(oxap)Fe(en) 2 ]SO 4 (1) and [Cu(oxap)Fe(pn) 2 ]SO 4 (2) have been characterized by variable temperature magnetic susceptibility (4.2∼'300 K) and the observed data were least‐squares fitted to the susceptibility equation derived from the spin Hamiltonian including single‐ion aero‐field interaction for the iron(II) ion, H =−2JŜ 1 ·;Ŝ 2 — D Ŝ 2 zl , giving the exchange integrals J =−21.9 cm −1 for 1 and J =−23.6 cm −1 for 2. These results are commensurate with antiferromagnetic interactions between adjacent metal ions within each molecule.