Molecular magnetic properties of two-copper(II) containing complexes [Cu(II) (1-phenylamidino-O-n-butylurea) en (H2O)(2)(2+) and [Cu(II) sulphato-mono (1-phenylamidino-O-methylurea)](2) - An EPR study
2004 (English)In: Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, ISSN 1386-1425, Vol. 60, no 7, 1593-1600 p.Article in journal (Refereed) Published
Electron paramagnetic resonance (EPR) investigations were conducted on [Cu(II) (1-phenylamidino-O-n-butylurea) en (H2O)12 21 (1) and [Cu(II) sulphato-mono (1-phenylamidino-O-methylurea)](2) (2) respectively, in the temperature range 300-77 K. Fine structure characteristics of S = 1 system, was observed in both complexes with zero field splitting of 0.0525 and 0.0225 cm(-1), respectively, suggesting the formation of dimeric complexes. The presence of the half-field signal (DeltaM(s)= +/-2), in the complex 1, further confirmed the formation of dimer. The temperature dependence of EPR signal intensity has given evidence for the ferromagnetic (FM) coupling between the two Cu2+ ions. The isotropic exchange interaction constants J, were evaluated from this and were found out to be similar to57 and similar to27 cm(-1), respectively, for the complexes I and 2. The photoacoustic spectra of these complexes had shown a band around 26,400 cm(-1) characteristic of metal-metal bonding giving an independent support for the existence of dimeric Cu2+ species. The high magnetic moment values at room temperature for complex I (2.68mu(B)) and complex 2 (2.00mu(B)), obtained from the magnetic susceptibility measurements, support the formation of ferromagnetically coupled Cu2+ dimers.
Place, publisher, year, edition, pages
2004. Vol. 60, no 7, 1593-1600 p.
copper(II) complexes; phenyldicyandiamide; EPR; PAS; FM coupling; dimer
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-53529DOI: 10.1016/j.saa.2003.08.020OAI: oai:DiVA.org:liu-53529DiVA: diva2:289597