Synthesis and Spectroscopic Studies of DichIoromono-(1-n-butylamidino-O-methylurea)copper(II),Dichloromono(1-i-butylamidino-O-methylurea)copper(II)and Dichloromono-(1-i-butylamidino-O-ethylurea)copper(II)Complexes

摘要

Electron paramagnetic resonance studies of dichloro( 1-n-butylamidino-O-methylurea)copper(II)(1),dichloro(1-i-butylamidino-O-methylurea)copper(II)(2)and dichloro(1-i-butylamidino-O-ethylurea)copper(II)(3)complexes were carried out in the temperature range 300-77 K.In complexes 1 and 2 apart from a strong signal at g ~ 2.0711 a weak half field signals(DLETA M_S=± 2)were also observed suggesting the formation of dimeric complexes.The photo acoustic spectra of the complexes had shown a band around 25000 cm~(-1)suggesting weak metal-metal interactions.The EPR spectral features of complex 3 are characteristic of axial symmetry and the hyperfine structure on parallel components of Cu~(2+)species is resolved.The EPR spectra at 77 K in pyridine has shown axial ligation of solvent molecules.The high magnetic moment values of complexes 1 and 2 had given evidence for the formation of ferromagnetically coupled Cu~(2+)dimers.