Akademik Veri Yönetim Sistemi
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, sa.4, ss.637-647, 1998 (SCI-Expanded)
In the present study, a neutral crown ether dye (NCED), [4-Nitrophenyl)(4-(4,7,10,13,16-pantoxa-lazacyclooctadecyl)phenyl] diazen and an ionic crown ether dye (ICED), 1-Methyl-{2-[4-(4,7, 10, 13, 16-pentaoxa-lazacyclooctadecyl)phenyl] ethenyl}pyridinium-iodide were synthesized and immobilized on sulfonated hydrocarbon-based block copolymer ionomer to determine Ba2+ and Cu2+ ions in aqueous solution. 5.0x10(-2) M ion solutions were used since the best absorbance increase was obtained with this concentration. The increases in absorbances after treating the NCED-immobilized thick polymer membranes (0.20 mm thickness) with Ba2+ and Cu2+ solutions were 0.1488 and 0.2446 ih 120 minutes, respectively. The absorbance increases were 0.1664 and 0.3710 during the same time-interval with ICED-immobilized membranes.The response time decreased and absorbance values increased when thin polymer membranes (0.04 mm thickness) were used. The absorbance increases were 0.5088 and 0.8761, respectively in one minute with the ICED-immobilized thin membranes. These results are in agreement with Shrinking in polymer dimensions. Dye-immobilized polymeric membranes can be used as sensors practically for both of the ions but sensitivity is higher towards Cu2+ ions.