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Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine
dc.creator | Đurđević, Predrag | |
dc.creator | Cvijović, Mirjana R. | |
dc.creator | Pavelkić, Vesna M. | |
dc.creator | Zakrzewska, J | |
dc.date.accessioned | 2018-03-01T19:44:47Z | |
dc.date.available | 2018-03-01T19:44:47Z | |
dc.date.issued | 2005 | |
dc.identifier.issn | 0038-7010 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/2967 | |
dc.description.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. | en |
dc.rights | restrictedAccess | en |
dc.source | Spectroscopy Letters | en |
dc.subject | aluminum | en |
dc.subject | 27-Al NMR | en |
dc.subject | complex formation | en |
dc.subject | L-histidine | en |
dc.subject | spectrophotometry | en |
dc.title | Spectrophotometric and 27-Al NMR characterization of aluminum(III) complexes with L-histidine | en |
dc.type | article | en |
dcterms.abstract | Дјурдјевиц, П; Цвијовиц, М; Павелкиц, В; Закрзеwска, Ј; | |
dc.citation.volume | 38 | |
dc.citation.issue | 4-5 | |
dc.citation.spage | 617 | |
dc.citation.epage | 634 | |
dc.identifier.wos | 000234818400018 | |
dc.identifier.doi | 10.1081/SL-200062968 | |
dc.citation.rank | M23 | |
dc.identifier.scopus | 2-s2.0-23044455302 |
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