Excited state proton transfer and E/Z photoswitching performance of 2-hydroxy-1-naphthalene and 1-naphthalene 5,5′-dimethyl- and 5,5′-diphenylhydantoin Schiff bases
作者:Anton Georgiev、Petar Todorov、Deyan Dimov
DOI:10.1016/j.jphotochem.2019.112143
日期:2020.1
substituted Schiff bases have lower R (9.6% and 19.7%), compared to the unsubstituted one (32.4% and 37.7%). The speed of back Z/E relaxation (k = 3.62 × 10−4 s-1 and k = 5.49 × 10−4 s-1) is unusual slower compared to the very fast E/Z photoconversion (k = 4.07 × 10-2 s-1 and k = 1.08 × 10-1 s-1). The behavior of the compounds was analyzed through optimization of the molecular geometry of enol and keto tautomers
Résumé Novel mixed complexes of copper (II) and cobalt (II) with 3-amino-5,5-dimethylhydantoin were synthesized and their in vitro anticancer activity was investigated. The structures of the compounds were confirmed by IR, UV–Vis spectrometry, voltammetry and elemental analysis. The cytotoxic effects of novel complexes of copper (II) and cobalt (II) with 3-amino-5,5-dimethylhydantoin were tested against a panel of human tumor cell lines. All of the compounds investigated exhibited different concentration-dependent antiproliferative effects against the HT29, MDA-MB-231, HepG2 and HeLa cell lines after 24 h of treatment. The most sensitive cells were the HepG2 cells at various concentrations of both tested compounds followed by HT29.
Photochromic and molecular switching behaviour of new Schiff bases containing hydantoin rings: synthesis, characterization and crystal structures
作者:Petar T. Todorov、Petia N. Peneva、Stela I. Georgieva、Rusi I. Rusew、Boris L. Shivachev、Anton H. Georgiev
DOI:10.1039/c8nj05748f
日期:——
The present study reports the synthesis and structural, photophysical and electrochemical properties of five new Schiff bases containing hydantoin rings. The compounds were synthesized via condensation reactions between 3-amino-5,5′-dimethylhydantoin and five different aromatic aldehydes. All compounds were characterized using different spectroscopic and electrochemical tools as well as single crystal
of the complexes the correlation analysis has been made. NBO analysis of the ligand and complexes provides the information about intramolecular resonance stabilization energy and charge transfer between ligand and metal ions. First derivative UV–Vis spectra were done in order to resolve the π→π* and n→π* carbonyl electron transitions of the ligand and complexes. We have shown that complexes with 1:2