synthesis, metal ion complexation and computational studies of thio oxocrown ethers的合成、金属离子络合和计算研究含硫的oxocrown醚.pdf

Molecules 2011, 16, 8670-8683; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Article Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers Baki Çiçek* and Ahmet Yıldız Department of Chemistry, Faculty of Science and Literature, University of Balikesir, 10145, Balıkesir, Turkey * Author to whom correspondence should be addressed; E-Mail: bcicek@.tr; Tel.: +90-266-612 10 00; Fax: +90-266- 612 12 15. Received: 17 August 2011; in revised form: 29 September 2011 / Accepted: 11 October 2011 / Published: 14 October 2011 Abstract: The synthesis of some thio-oxocrown ether ligands, B1 (1,4-dithio-12-crown-4), B2 (1,7-dithio-12-crown-4), B3 (1,7-dithio-15-Crown-5), B4 (1,7-dithio-18-crown-6), B5 (1,10-dithio-18-crown-6), B6 (1,10-dithio-21-crown-7), under mild conditions, were reported. The ligands were characterized by FT-IR, 1H NMR and GC-MS spectroscopy. + +2 + + The formation of 1:1 ligand complexes with a variety of metal salts (Ag , Ca , K , Na , Mg+2, Zn+2 and Fe+2) were investigated by a conductometric method in a 1:1 dioxane– water system at 25 °C, and the complexation constants (K = ( -) / ((- ) L) e MAm MaLbAm and free energy (∆Go= - RT lnK ) values are calculate