286386-71-8Relevant academic research and scientific papers
Structurally diverse copper(II)-carboxylato complexes: Neutral and ionic mononuclear structures and a novel binuclear structure
Psomas, George,Raptopoulou, Catherine P.,Iordanidis, Lykourgos,Dendrinou-Samara, Catherine,Tangoulis, Vassilis,Kessissoglou, Dimitris P.
, p. 3042 - 3048 (2000)
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 P1, in a cell of dimensions a = 10.813(1) A, b = 12.138(1) A, c = 11.909(1) A, α = 86.448(3)°, β = 80.127(3)°, and γ = 63.982(3)°, and V = 1383.7(2) A3, with Z = 1.2 crystallizes in space group I2/a, in a cell of dimensions a = 29.958(9) A, b = 11.342(3) A, c = 21.196(7) A, β = 107.94(1)°, and V = 6852.2(4) A3, with Z = 8. 3 crystallizes in space group P1, in a cell of dimensions a = 8.7419(8) A, b = 12.512(1) A, c = 14.598(1) A, α = 110.737(1)°, β = 95-742(2)°, γ = 103.286(2)°, V = 1424.1(2) A3, with Z = 2.
