Syntheses, structure, and electrochemical properties of unsymmetrical crown-annelated TTF derivatives

摘要

A series of new crown-ether annelated TTF derivatives 2a, 2b, 2c, 3 and 5 have been synthesized and characterized by melting points, NMR, IR and ESI-MS. The crystal structure of compound 3, 2, 3-dithia-(5',8'-dioxaoctyl)-6,7-ethylenedithiatetrathiafulvalene, has been determined by X-ray crystallography. Redox properties of all these compounds have been investigated by cyclic voltammetry and each compound shows two reversible single-electron redox couples. The results indicate that 3 is responsive for Li+, but not to other alkali metal cations, such as Na+ and K+. Although with the same cavity, compounds 2c and 5 show marked changes upon the addition of sodium perchlorate, while there is no significant response for 2a and 2b at the same condition.