Structurally Diverse Copper (II)− Carboxylato Complexes: Neutral and Ionic Mononuclear Structures and a Novel Binuclear Structure
G Psomas, CP Raptopoulou, L Iordanidis… - Inorganic …, 2000 - ACS Publications
Inorganic Chemistry, 2000•ACS Publications
The copper complexes with the commercial auxin herbicides MCPA, 2, 4-D, and 2, 4, 5-T in
the presence of a nitrogen donor heterocyclic ligand, phen or bipyam, were prepared and
characterized. The available evidence supports a dimeric structure for the 2, 4-D complex in
the presence of bipyam while phen leads to monomeric forms. The EPR spectrum of Cu2 (2,
4-D) 4 (bipyam) 2 at 4 K in the solid state exhibits an axial signal which corresponds to
almost isolated S= 1/2 magnetic ions. Magnetic data for the dimer show a weak …
the presence of a nitrogen donor heterocyclic ligand, phen or bipyam, were prepared and
characterized. The available evidence supports a dimeric structure for the 2, 4-D complex in
the presence of bipyam while phen leads to monomeric forms. The EPR spectrum of Cu2 (2,
4-D) 4 (bipyam) 2 at 4 K in the solid state exhibits an axial signal which corresponds to
almost isolated S= 1/2 magnetic ions. Magnetic data for the dimer show a weak …
The copper complexes with the commercial auxin herbicides MCPA, 2,4-D, and 2,4,5-T in the presence of a nitrogen donor heterocyclic ligand, phen or bipyam, were prepared and characterized. The available evidence supports a dimeric structure for the 2,4-D complex in the presence of bipyam while phen leads to monomeric forms. The EPR spectrum of Cu2(2,4-D)4(bipyam)2 at 4 K in the solid state exhibits an axial signal which corresponds to almost isolated S = 1/2 magnetic ions. Magnetic data for the dimer show a weak antiferromagnetic interaction between the two metal ions with J = −0.8 cm-1. The crystal structures of tetrakis[(2,4-dichlorophenoxy)acetato]bis(2,2‘-bipyridylamine)dicopper(II), 1, bis(1,10-phenanthroline)[(2,4,5-trichlorophenoxy)acetato]copper(II) chloride, 2, and aqua(1,10-phenanthroline)bis[((2-methyl-4-chlorophenoxyacetato]copper(II), 3, were determined and refined by least-squares methods using three-dimensional MoKα data. 1 crystallizes in space group P1̄, in a cell of dimensions a = 10.813(1) Å, b = 12.138(1) Å, c = 11.909(1) Å, α = 86.448(3)°, β = 80.127(3)°, and γ = 63.982(3)°, and V = 1383.7(2) Å3, with Z = 1. 2 crystallizes in space group I2/a, in a cell of dimensions a = 29.958(9) Å, b = 11.342(3) Å, c = 21.196(7) Å, β = 107.94(1)°, and V = 6852.2(4) Å3, with Z = 8. 3 crystallizes in space group P1̄, in a cell of dimensions a = 8.7419(8) Å, b = 12.512(1) Å, c = 14.598(1) Å, α = 110.737(1)°, β = 95.742(2)°, γ = 103.286(2)°, V = 1424.1(2) Å3, with Z = 2.
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