Trinuclear, antiferromagnetically coupled Cu(II) complex with an EPR spectrum of mononuclear Cu(II): effect of alcoholic solvents.
A rigid trinuclear copper pyrazolato framework supports the solvolytic exchange of mu3-X by mu3-OR ligands (X = Cl and Br; R = alkyl group), converting the trinuclear ferromagnetically coupled S = 3/2 system to antiferromagnetically coupled S = 1/2 in the solid state. In contrast, we propose that, in alcoholic solutions, solvolysis results in unsymmetrical coordination of the Cu3 cluster, magnetically decoupling one Cu center from the other two. This disguises the intact triangular Cu(II)3 system as a mononuclear Cu(II) complex in its electron paramagnetic resonance spectrum.
Mezei
Gellert
G
Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico.
Raptis
Raphael G
RG
Telser
Joshua
J
D000438:Alcohols / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D011720:Pyrazoles / Q000737:chemistry*; D012997:Solvents; D021241:Spectrometry, Mass, Electrospray Ionization
D000438:Alcohols; D009942:Organometallic Compounds; D011720:Pyrazoles; D012997:Solvents; D003300:Copper