Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine
Апстракт
The complex formation between L-histidine (HHis) and aluminum(III) ion in water solutions was studied by UV spectrophotometric and 27-Al NMR measurements at 298 K. UV spectra were measured on solutions in which the total concentration of histidine was from 15.0 to 50.0 mmol/dm(3) and the concentration ratio of histidine to aluminum was varied from 3 : 1 to 10 : 1 in the pH range between 4.2 and 6.0. The spectra were taken in the wavelength interval 240 - 340 nm. Nonlinear least-squares treatment of the spectrophotometric data indicates the formation of the complexes Al(HHis)(3+), Al(His)(2+), Al(HHis)His(2+), and Al-2(OH)His(4+) with the overall formation constants beta(p,q,r): log beta(1,1,1) = 11.90 +/- 0.04, log beta(1,1,0) = 7.25 +/- 0.08, log beta(1,2,1) = 20.1 +/- 0.1, and log beta(2,1,1) = 5.92 +/- 0.12 ( p, q, r are stoichiometric indices for metal, ligand, and proton, respectively). Al-27-NMR spectra were taken on solutions with the concentration of aluminum 50 mmol/dm(3) and ...that of histidine 250 mmol/dm(3). In the pH interval 5.0 - 6.1, two resonances at 9.5 ppm and 12.0 ppm were assigned to Al(HHis)(2+) and Al( HHis)(His)(2+) (or Al(OH)(HHis)(2)(2+)), respectively.
Кључне речи:
aluminum / 27-Al NMR / complex formation / L-histidine / spectrophotometryИзвор:
Spectroscopy Letters, 2005, 38, 4-5, 617-634
DOI: 10.1081/SL-200062968
ISSN: 0038-7010
WoS: 000234818400018
Scopus: 2-s2.0-23044455302
Колекције
Институција/група
VinčaTY - JOUR AU - Đurđević, Predrag AU - Cvijović, Mirjana R. AU - Pavelkić, Vesna M. AU - Zakrzewska, J PY - 2005 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2967 AB - The complex formation between L-histidine (HHis) and aluminum(III) ion in water solutions was studied by UV spectrophotometric and 27-Al NMR measurements at 298 K. UV spectra were measured on solutions in which the total concentration of histidine was from 15.0 to 50.0 mmol/dm(3) and the concentration ratio of histidine to aluminum was varied from 3 : 1 to 10 : 1 in the pH range between 4.2 and 6.0. The spectra were taken in the wavelength interval 240 - 340 nm. Nonlinear least-squares treatment of the spectrophotometric data indicates the formation of the complexes Al(HHis)(3+), Al(His)(2+), Al(HHis)His(2+), and Al-2(OH)His(4+) with the overall formation constants beta(p,q,r): log beta(1,1,1) = 11.90 +/- 0.04, log beta(1,1,0) = 7.25 +/- 0.08, log beta(1,2,1) = 20.1 +/- 0.1, and log beta(2,1,1) = 5.92 +/- 0.12 ( p, q, r are stoichiometric indices for metal, ligand, and proton, respectively). Al-27-NMR spectra were taken on solutions with the concentration of aluminum 50 mmol/dm(3) and that of histidine 250 mmol/dm(3). In the pH interval 5.0 - 6.1, two resonances at 9.5 ppm and 12.0 ppm were assigned to Al(HHis)(2+) and Al( HHis)(His)(2+) (or Al(OH)(HHis)(2)(2+)), respectively. T2 - Spectroscopy Letters T1 - Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine VL - 38 IS - 4-5 SP - 617 EP - 634 DO - 10.1081/SL-200062968 ER -
@article{ author = "Đurđević, Predrag and Cvijović, Mirjana R. and Pavelkić, Vesna M. and Zakrzewska, J", year = "2005", abstract = "The complex formation between L-histidine (HHis) and aluminum(III) ion in water solutions was studied by UV spectrophotometric and 27-Al NMR measurements at 298 K. UV spectra were measured on solutions in which the total concentration of histidine was from 15.0 to 50.0 mmol/dm(3) and the concentration ratio of histidine to aluminum was varied from 3 : 1 to 10 : 1 in the pH range between 4.2 and 6.0. The spectra were taken in the wavelength interval 240 - 340 nm. Nonlinear least-squares treatment of the spectrophotometric data indicates the formation of the complexes Al(HHis)(3+), Al(His)(2+), Al(HHis)His(2+), and Al-2(OH)His(4+) with the overall formation constants beta(p,q,r): log beta(1,1,1) = 11.90 +/- 0.04, log beta(1,1,0) = 7.25 +/- 0.08, log beta(1,2,1) = 20.1 +/- 0.1, and log beta(2,1,1) = 5.92 +/- 0.12 ( p, q, r are stoichiometric indices for metal, ligand, and proton, respectively). Al-27-NMR spectra were taken on solutions with the concentration of aluminum 50 mmol/dm(3) and that of histidine 250 mmol/dm(3). In the pH interval 5.0 - 6.1, two resonances at 9.5 ppm and 12.0 ppm were assigned to Al(HHis)(2+) and Al( HHis)(His)(2+) (or Al(OH)(HHis)(2)(2+)), respectively.", journal = "Spectroscopy Letters", title = "Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine", volume = "38", number = "4-5", pages = "617-634", doi = "10.1081/SL-200062968" }
Đurđević, P., Cvijović, M. R., Pavelkić, V. M.,& Zakrzewska, J.. (2005). Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine. in Spectroscopy Letters, 38(4-5), 617-634. https://doi.org/10.1081/SL-200062968
Đurđević P, Cvijović MR, Pavelkić VM, Zakrzewska J. Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine. in Spectroscopy Letters. 2005;38(4-5):617-634. doi:10.1081/SL-200062968 .
Đurđević, Predrag, Cvijović, Mirjana R., Pavelkić, Vesna M., Zakrzewska, J, "Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine" in Spectroscopy Letters, 38, no. 4-5 (2005):617-634, https://doi.org/10.1081/SL-200062968 . .