Naslov
Fluorescence quantum yields of selected heterocyclic schiff bases and of their complexes with Be(II), Mg(II), Al(III) and Zn(II)

Autori
Miljanić, Snežana ; Cimerman, Zvjezdana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XV. Meeting of Croatian Chemists and Chemical Engineers: abstracts / Gojo, Miroslav ; Trajkov, Nada ; Smolec, Sonja - : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 1997, 219-219

Skup
XV. hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Opatija, Hrvatska, 24.03.1997. - 26.03.1997

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Sažetak
Quantum efficiencies of a series of Schiff bases of salicylaldehyde with amino- and aminoalkylpyridines were measured in dioxan/water 1/1 at 250 C, using quinine sul-phate as standard. When excited in the range 290-390 nm, the studied Schiff bases emitted in the range 350-500 nm, whereas the emission intensity depended on the pH of the medium. In neutral solutions quantum efficiencies were low in most cases (pH 7,0.01-0.05), but they increased in alkaline (pH 12, 0.02-0.32) and acidic (pH 2, 0.02-0.52) solutions. The most fluorescent species were the protonated forms of N,N˘- bis(salicyilidene)-2,6-pyridinediamine and 2-(2-pyridyliminomethyl)phenol having quantum yields of 0.4 and 0.52 respectively. Metal ions influenced fluorescence prop-erites of all Schiff bases, causing shifts in excitation and emission maxima and changes in quantum yields. Complex formation with Be(II), Mg(II), Al(III) and Zn(II) in neu-tral solution resulted in increase of the quantum yields up to 0.5, indicating that the studied compounds can be used as sensitive fluorimetric reagents.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA