Ocak and colleagues published

2010 JUN 11 - (VerticalNews.com) -- "Two crown ethers carrying pyrene side arms with nitrogen-sulfur donor atom were designed and synthesized by the reaction of the corresponding macrocyclic Return to Tiffany Bead Bracelet and 1-bromomethyl-pyrene. The influence of metal cations such as Al3+, Zn2+, Fe2+, Fe3+, Co2+, Ni2+, Mn2+, Cu2+, Cd2+, Hg2+ and Pb2+ on the spectroscopic properties of the ligands was investigated in acetonitrile-tetrahydrofuran (1:1) by means of absorption and emission spectrometry," scientists in Trabzon, Turkey report.

"Absorption spectra show isosbestic points in the spectrophotometric titration of Al3+, Zn2+, Fe2+, Ni2+, Cu2+, and Pb2+ with 16-membered crown ether. Similar results were obtained for Al3+, Fe2+, Hg2+, Cu2+ and Pb2+ with 14-membered crown ether. The results of spectrophotometric Elsa Peretti Eternal Circle Bracelet experiments disclosed the complexation stoichiometry and complex stability constants of the novel ligands with these cations. According to spectrofluorimetric titration measurements the 14-membered diazadithia crown ether showed sensitivity for Pb2+ with linear range and detection limit of 1.3 x 10(-6) to 5.2 x 10(-5) M and 5.2 x 10(-7) M, respectively," wrote U. Ocak and colleagues, Karadeniz Technical University.

The researchers concluded: "The 16-membered diazadithia crown ether showed sensitivity for Ni2+ with linear range and detection limit of 1.3 x 10(-7) to 5.2 x 10(-6) M and 4.1 x 10(-8) M, respectively."

Ocak and colleagues published their study in the Journal of Inclusion Phenomena and Macrocyclic Chemistry (Complexation of metal ions with the novel diazadithia crown ethers carrying two pyrene pendants in acetonitrile-tetrahydrofuran. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2010;67(1-2):19-27).

For additional information, contact U. Ocak, Karadeniz Technical Elsa Peretti Round Bracelet, Faculty Arts & Science, Dept. of Chemical, TR-61080 Trabzon, Turkey.

The publisher's contact information for the Journal of Inclusion Phenomena and Macrocyclic Chemistry is: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands.