An EPR and voltammetric study of simple and mixed copper(II) complexes with L- or D-glutamate and L-arginate in aqueous solution(302 views visite)(PDF restricted privato162 views visite) Valora G, Bonomo RP, Tabbì G
Keywords Parole chiave: Cw Epr, Cu(ii) Complexes, Aminoacidate Ligands, Trans Copper Conformers, Electrostatic Interactions, Swv Formal Redox Potentials,
Affiliations Affiliazioni: *** IBB - CNR ***
Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy CNR, Istituto di Biostrutture e Bioimmagini, Via P. Gaifami 18, 95126 Catania, Italy
[14] R. Bregier-Jarzebowska, J. Solution Chem. 43 (2014) 2144–2162.
[15] G. Brookes, L.D. Pettit, J. Chem. Soc., Dalton Trans. (1977) 1918–1924.
[16] T. Lund, J. Vanngard, Chem. Phys. 42 (1965) 2979–2980.
[17] T. Sakurai, O. Yamauchi, A. Nakahara, Bull. Chem. Soc. Japan 51 (1978) 3203–
[18] E. Kaifer, J. Bard, J. Phys. Chem. 89 (1985) 4876–4880.
[19] N. Ohata, H. Masuda, O. Yamauchi, Inorg. Chim. Acta 302 (2000) 749–761.
[20] L. Borer, D. Gallagher, J. Ready, ChemBio News 15 (1) (2005) 40.
[21] M.S. Bukharov, V.G. Shtyrlin, A.S. Mukhtarov, G.V. Mamin, S. Stapf, C. Mattea, A. A. Krutikov, A.N. Il’in, N.Y. Serov, Chem. Phys. 16 (2014) 9411–9421.
[22] R.P. Bonomo, F. Riggi, A.J. Di Bilio, Inorg. Chem. 27 (1988) 2510–2512.
[23] R.P. Bonomo, F. Riggi, Chem. Phys. Lett. 93 (1982) 99–102.
[25] J.E. Wertz, J.R. Bolton, Electron Spin Resonance. Elementary Theory and Practical Applications, Mac Graw Hill, New York, 1972.
[26] B.A. Goodman, D.B. McPhail, H. Kipton, J. Powell, J. Chem. Soc., Dalton Trans.
[27] H.A. Kuska, M.T. Rogers, Electron Spin Resonance of Transition Metal Complex Ions, Coordination Chemistry, in: A.E. Martell (Ed.), ACS Monograph, vol. 1, Van Nostrand Reinhold Company, New York, 1971.
[28] H. Masuda, A. Odani, T. Yamazaki, T. Yajima, O. Yamauchi, Inorg. Chem. 32
[29] P. Pary, L.N. Bengoa, W.A. Egli, J. Electrochem. Soc. 162 (2015) D275–D282.
[30] G. Tabbì, A. Giuffrida, R.P. Bonomo, J. Inorg. Biochem. 128 (2013) 137–145.
[31] T. Weiser, M. Wienrich, Brain Res. 742 (1996) 211–218.
An EPR and voltammetric study of simple and mixed copper(II) complexes with L- or D-glutamate and L-arginate in aqueous solution
EPR CW measurements at room and low temperature have been carried out on the systems containing 63copper(II) nitrate, L-Arg and L-or D-Glu or DL- racemic mixtures of both amino acids in aqueous solution or in mixed solvents. For these copper(II) bis and ternary complexes, RT EPR spectra revealed that mixtures of cis and trans conformers are really present in aqueous solution. In most cases, for these systems, the cis conformer is more abundant at the lowest temperature (275 K). Increasing gradually the temperature from 275 K to 305 K the cis/trans ratio tends towards the trans conformer. This latter is less abundant in the case of [Cu(L-Glu)2], because of the possible interaction of negative side chain carboxylate anions with the water molecules axially bound, and for [Cu(L-Arg)(D-Glu)], probably owing to a possible electrostatic interaction between the two opposite charged side chains which are on the same side of the CuN2O2 coordination plane. Low temperature frozen solution EPR spectra run on these systems show the presence of only one absorbing specie thus giving reason to the stabilization of one conformer over the other, in particular, the cis conformer. There are no evident differences in the anisotropic Spin Hamiltonian parameters derived from the frozen EPR solution spectra of these systems, which are characterized by a tetragonally elongated octahedral stereochemistry. SWV measurements confirmed the EPR spectroscopic data, actually giving rise to the observation of slightly asymmetrical peaks, which revealed two near formal redox potentials assigned to the two conformers.
An EPR and voltammetric study of simple and mixed copper(II) complexes with L- or D-glutamate and L-arginate in aqueous solution
No results. Nessun risultato.
An EPR and voltammetric study of simple and mixed copper(II) complexes with L- or D-glutamate and L-arginate in aqueous solution
3 Records (3 escludendo Abstract e Conferenze). Impact factor totale: 11.251 (11.251 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 12.113 (12.113 escludendo Abstract e Conferenze).
Last modified by Ultima modifica di Marco Comerci on in data Sunday 12 July 2020, 13:15:18 302 views visite. Last view on Ultima visita in data Friday 26 February 2021, 10:53:25