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Synthesis and ferromagnetic interaction in oxamido‐bridged heterodinuclear copper(II)‐chromium (III) complexes
Author(s) -
Li YanTuan,
Yan CuiWei,
Liao DaiZheng
Publication year - 1999
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.19990170104
Subject(s) - chemistry , molar conductivity , chromium , copper , octahedron , crystallography , ferromagnetism , ion , magnetic susceptibility , magnetism , inductive coupling , inorganic chemistry , crystal structure , condensed matter physics , elemental analysis , physics , organic chemistry , engineering , electrical engineering
Four μ ‐ oxamido heterodinuclear complexes, [Cu (oxae) Cr (L) 2 ] (NO 3 ) 3 , where oxae denotes the N, N' bis (2‐aminoethyl) oxamido dianion and L represents 1,10‐phenanthroline (phen); 5‐nitro‐1,10‐phenanthroline (NO 2‐ phen); 5‐methyl‐1, 10‐phenanthroline (Me‐phen) and 2, 2′‐bipyridine (bpy), have been synthesized and characterized by elemental analyses, magnetic moments (at room temperature) and molar conductivity measurements and spectroscopy. It is proposed that these complexes have extended oxamido‐bridged structures consisting of a copper (II) ion and a chromium (III) ion, which have a square planar environment and octahedral environment, respectively. The cryomagnetic properties of the [Cu(oxae)Cr(bpy) 2 (NO 3 ) 3 (1) and [Cu(oxae)Cr(phen) 2 ](NO 3 ) 3 (2) complexes have been measured over the range of 4.2–300 K. The leastsquares fit of the experimental data based on the spin Hamiltonian, Ĥ = ‐ 2JŜ 1 ·Ŝ 2 , the exchange integrals ( J ) were evaluated as +36.9 cm −1 for 1 and +35.8 cm −1 for 2. The reds have connived that the spin coupling between the adjacent copper (II) and chromium (III) ions through oxamido‐bridge in both 1 and 2 is ferromagnetic.