The effects of mono- and divalent metal cations on the solution structure of caffeine and theophylline
Yazarlar (3)
Shohreh Nafisi Islamic Azad University, İran
Prof. Dr. Majıd MONAJJEMI Islamic Azad University, Science And Research Branch, İran
Saeedeh Ebrahimi Islamic Azad University, Science And Research Branch, İran
| Makale Türü | Özgün Makale (ESCI dergilerinde yayınlanan tam makale) | ||
| Dergi Adı | Journal of Molecular Structure | ||
| Dergi ISSN | 0022-2860 Wos Dergi Scopus Dergi | ||
| Makale Dili | İngilizce | Basım Tarihi | 11-2004 |
| Cilt / Sayı / Sayfa | 705 / 1 / 35–39 | DOI | 10.1016/j.molstruc.2004.04.022 |
| Makale Linki | http://www.scopus.com/inward/record.url?eid=2-s2.0-4444326835&partnerID=MN8TOARS | ||
| Özet |
| The interactions of caffeine and theophylline with potassium+, cobalt2+ and nickel2+ ions were studied in aqueous solution at physiological pH with constant ligand concentration and various metal ion contents. Fourier Transform infrared spectroscopy and absorption spectra were used to determine the cation binding mode and association constants. Spectroscopic results showed direct and indirect cation interactions for Co2+, Ni2+ and K+ through O6 and N9 atoms (caffeine) and O6, N9 and N7 atoms (theophylline). The overall binding constants were, K(Co-caffeine)=6.92×104M-1, K(Ni-caffeine)=2.22×104M-1, K(K-caffeine)=5. 08×103M-1, K(Co-theophylline)=5.06×10 4M-1, K(Ni-theophylline)=4.84×104M -1 and K(K-theophylline)=2.13×103M-1. The association constants showed weaker interaction for monovalent cation than divalent metal ions. © 2004 Elsevier B.V. All rights reserved. |
| Anahtar Kelimeler |
| Binding constant | Caffeine | FTIR | FTIR, Fourier Transform infrared | Metal cation | Theophylline | UV-visible spectroscopy |
Science Direct
The effects of mono- and divalent metal cations on the solution structure of caffeine and theophylline
BM Sürdürülebilir Kalkınma Amaçları
| Atıf Sayıları | |
| Web of Science | 31 |
| Scopus | 87 |