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Pregled bibliografske jedinice broj: 479721

Časopis

Autori: Galić, Nives; Burić, Nataša; Tomaš, Renato; Frkanec, Leo; Tomišić, Vladislav
Naslov: Synthesis and cation binding properties of fluorescent calix[4]arene derivatives bearing tryptophan units at the lower rim
( Synthesis and cation binding properties of fluorescent calix[4]arene derivatives bearing tryptophan units at the lower rim )
Izvornik: Supramolecular chemistry (1061-0278) 23 (2011), 5; 389-397
Vrsta rada: članak
Ključne riječi: calixarenes; alkali metal cations; europium(III); stability constants; fluorescence
( calixarenes; alkali metal cations; europium(III); stability constants; fluorescence )
Sažetak:
The fluorescent peptidocalixarenes, 5, 11, 17, 23-tetra-tert-butyl-25, 26, 27, 28-tetrakis(O-methyl-L-tryptophanylcarbonylmethoxy)calix[4]arene (1) and 5, 11, 17, 23-tetra-tert-butyl-25, 27-di(O-methyl)-26, 28-bis(O-methyl-L-tryptophanylcarbonylmethoxy)calix[4]arene (2), were prepared by introducing tryptophan subunits at a lower calixarene rim. Coordination abilities of 1 and 2 towards europium(III) and alkali metal cations were studied by spectrophotometric, spectrofluorimetric, conductometric and potentiometric titrations in acetonitrile at 25 oC. Rather strong complexation was observed for smaller alkali metal cations Li+ and Na+ (log KLi1 > 6, log KLi2 > 6, log KNa1 = 8.25, logKNa2 = 6.94), and moderate for K+ (log KK1 = 5.09, log KK2 = 4.09). Larger Rb+ and Cs+ cations did not fit in the ion-binding site of 1 so no complexation was detected, whereas the more flexible ligand 2 accommodated Rb+ cation (log KRb2 = 3.44). The fluorescence of 1 (ex = 280 nm, em = 340 nm) was remarkably quenched by Eu(III). Stability constant of 1:1 (Eu3+:1) complex determined spectrofluorimetrically amounted to log KEu1 = 6.16.
Projekt / tema: 119-1191342-2960, 098-0982904-2912
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Kemija
URL Internet adrese: http://www.tandfonline.com/doi/abs/10.1080/10610278.2010.521832
http://dx.doi.org/10.1080/10610278.2010.521832
Broj citata:
Altmetric:
DOI: 10.1080/10610278.2010.521832
URL cjelovitog teksta:
Google Scholar: Synthesis and cation binding properties of fluorescent calix[4]arene derivatives bearing tryptophan units at the lower rim
Upisao u CROSBI: ngalic@chempmf.hr (ngalic@chempmf.hr), 2. Ruj. 2010. u 13:14 sati



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