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The Determination of the geometry of Cu(II) complexes: an EPR spectroscopy experiment

Garribba, Eugenio and Micera, Giovanni (2006) The Determination of the geometry of Cu(II) complexes: an EPR spectroscopy experiment. Journal of Chemical Education, Vol. 83 (8), p. 1229-1232. ISSN 0021-9584. Article.

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Abstract

An instrumental experiment is presented in which eleven Cu(II) complexes are studied with electron paramagnetic resonance (EPR) spectroscopy. The EPR spectroscopy allows the characterization of the geometry and electronic structure of the copper complexes. Three common ligands, ethylenediamine (en), 1,10-phenanthroline (phen), and 2,2′-bipyridine (bpy), were used. Examination of the EPR spectra of the solid-state compounds demonstrates that [Cu(en)2(ClO4)2], [Cu(en)2(BF4)2], and [Cu(en)2(NO3)2] have a dx2-y2 ground state and an elongated octahedral geometry; that [Cu(phen)2(H2O)](NO3)2, [Cu(phen)2(H2O)](BF4)2, and [Cu(bpy)2Cl]ClO4 are characterized by a geometry intermediate between the square pyramid and the trigonal bipyramid and a ground state corresponding to the linear combination of the dx2-y2 and dz2 orbitals; and that [Cu(phen)2Cl]ClO4, [Cu(phen)2Br]ClO4, [Cu(bpy)2Br]ClO4, [Cu(phen)2]ClO4, and [Cu(bpy)2I]ClO show a geometry close to the trigonal bipyramid and a ground state of dz2. A theoretical explanation of the results is presented.

Item Type:Article
ID Code:2816
Status:Published
Refereed:Yes
Uncontrolled Keywords:Coordination compounds, copper, crystal field/ligand field theory, EPR/ESR spectroscopy, hands-on learning/manipulatives, inorganic chemistry, instrumental methods, laboratory instruction, molecular properties/structure, solid state chemistry, transition elements, upper-division undergraduate
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:American Chemical Society
ISSN:0021-9584
Deposited On:25 Aug 2009 11:29

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