Premium
Synthesis, Characterization and Magnetic Studies of μ‐Oxamido Copper (II) ‐ Chromium (III) Heterodinuclear Complexes
Author(s) -
Li YanTuan,
Yan CuiWei,
Hu ChunXia,
Liao DaiZheng
Publication year - 2001
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.20010190309
Subject(s) - chemistry , chromium , molar conductivity , copper , crystallography , octahedron , magnetic susceptibility , magnetic moment , ferromagnetism , ion , inorganic chemistry , crystal structure , elemental analysis , condensed matter physics , physics , organic chemistry
Three new μ‐oxamido‐bridged heterodinuclear copper (II)‐chromium (III) complexes formulated [Cu(Me 2 oxpn)Cr‐(L) 2 ](NO 3 ) 3 , where Me 2 oxpn denotes N,N '‐bis(3‐amino‐2, 2‐dimethylpropyl)oxamido dianion and L represents 5‐methyl‐1,10‐phenanthroline (Mephen), 4,7‐diphenyl‐1,10‐phenanthroline (Ph 2 phen) or 2,2′‐bipyridine (bpy), have been synthesized and characterized by elemental analyses, IR and electronic spectral studies, magnetic moments of room‐temperature and molar conductivity measurements. It is proposed that these complexes have oxamido‐bridged structures consisting of planar copper (II) and octahedral chromium (III) ions. The variable temperature magnetic susceptibilities (4.2–300 K) of complexes [Cu(Me 2 oxpn)Cr(Ph 2 phen) 2 ](NO 3 ) 3 (1) and [Cu(Me 2 oxpn)Cr(Mephen) 2 ] (NO 3 ) 3 (2) were further measured and studied, demonstrating the ferromagnetic interaction between the adjacent chromium (III) and copper (II) ions through the oxamido‐bridge in both complexes 1 and 2. Based on the spin Hamiltonian, Ĥ = ‐ 2JŜ 1 · Ŝ 2 , the exchange integrals J were evaluated as + 21.5 an −1 for 1 and + 22.8 cm −1 for 2.