Kavak E., Şevik M., Aydoğan A., Demir S., Solmaz G., Semerci F., ...More
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, vol.34, no.9, pp.4255-4266, 2024 (SCI-Expanded, Scopus)
Abstract
Three Zn(II)-coordination polymers, namely, {[Zn-2(mu (4)-L)(mu -obix)(2)]4DMF}(n) (1), {[Zn-2(mu (4)-L)(mu -mbix)(2)]6H(2)O}(n) (2) and {[Zn-2(mu (4)-L)(mu -pbix)(2)]5H(2)O}(n) (3), (L4-: 5,5'-(terephthaloylbis(azanediyl))diisophthalate and obix (y = 2), mbix (y = 3), pbix (y = 4): 1,y-bis((1H-imidazol-1-yl)methyl)benzene) were prepared with a tetracarboxylic acid and flexible isomeric bis(imidazole) linkers and characterized. The compounds displayed structural diversity depending on the rotation of imidazole rings around the -CH2- groups on bis(imidazole) ligands. Compounds 1-3 showed 2-fold interpenetrated 3D framework, 2D structure and 3D framework, respectively. The compounds showed high emissions in solid-state and solutions. Luminescence experiments showed that compounds 1-3 displayed sensitive detection towards Fe3+ ions with detection limits of 2.31 ppm, 5.17 ppm and 2.61 ppm, respectively. Moreover, the compounds could selectively detect Fe3+ ions over the other interfering metal ions via luminescence quenching. The detection mechanism could be ascribed to the competitive light absorption between Fe3+ ions and the compounds.