Crystal structure, spectroscopic, magnetic and electronic structure studies of a novel Cu(II) amino acid complex [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}(P{sub 4}O{sub 12}){center_dot}8H{sub 2}O
- Laboratoire de Physique Appliquee, Faculte des Sciences, B.P. 1171, 3000 Sfax, Universite de Sfax (Tunisia)
- Laboratory of Materials Chemistry, Faculty of Sciences of Bizerte, 7021 Zarzouna-Bizerte (Tunisia)
- Petrochemical Research Chair, College of Science, King Saud University, Riyadh (Saudi Arabia)
- Institut Neel, CNRS-Universite J. Fourier, BP 166, 38042 Grenoble (France)
Single crystals of a novel copper (II) complex with the amino acid L-arginine (L-arg) and cyclotetraphosphate, [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}(P{sub 4}O{sub 12}){center_dot}8H{sub 2}O, were prepared in aqueous solution and were characterized by X-ray diffraction, spectroscopy (diffuse reflectance, UV-vis and IR) and thermal analysis. Magnetic measurements and electronic structure calculations were also performed. Crystal structure determination reveals that this compound has a nonsymmetrical atomic arrangement, containing mainly a binuclear [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}{sup 4+} cation and an uncoordinated cyclotetraphosphate counter-anion (P{sub 4}O{sub 12}{sup 4-}). The tetravalent cation contains two independent Cu(II) ions in two different chemical environments. This compound exhibits an antiferromagnetic (AFM) to paramagnetic (PM) phase transition at a temperature (T{sub N}) lower than 2 K. The values of paramagnetic Curie-Weiss temperature ({theta}{sub cw}) and the exchange parameter (J/K{sub B}) emphasize the existence of an antiferromagnetic interaction between the neighboring copper ions. - Graphical abstract: The atomic arrangement of [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}(P{sub 4}O{sub 12}){center_dot}8H{sub 2}O is built up of corrugated 2D-supramolecular layers and 1D-supramolecular anionic chain constructed by [P{sub 4}O{sub 12}(H{sub 2}O){sub 6}]{sub n}{sup 4n-}. Highlights: Black-Right-Pointing-Pointer Crystal structure of unusual cationic binuclear complex of [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}(P{sub 4}O{sub 12}){center_dot}8H{sub 2}O. Black-Right-Pointing-Pointer An anti-syn equatorial-apical carboxylate bridging mode of both copper (II) centers. Black-Right-Pointing-Pointer [Cu(L-arg){sub 2}(H{sub 2}O)]{sub 2}{sup 4+} are held together by extensive H-bonds into wave-like layer. Black-Right-Pointing-Pointer Magnetic measurements exhibit an antiferomagnetic interaction between Cu(II). Black-Right-Pointing-Pointer Electronic structure calculation confirms the insulator state of the complex.
- OSTI ID:
- 22149973
- Journal Information:
- Journal of Solid State Chemistry, Vol. 196; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ANIONS
ANTIFERROMAGNETISM
AQUEOUS SOLUTIONS
ARGININE
ATOMIC FORCE MICROSCOPY
CATIONS
COPPER
COPPER IONS
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
INTERACTIONS
LAYERS
MONOCRYSTALS
PARAMAGNETISM
PHASE TRANSFORMATIONS
SPECTROSCOPY
THERMAL ANALYSIS
WATER
X-RAY DIFFRACTION