The synthesis of thiophene based conducting polymer molecular actuators, exhibiting electrically triggered molecular conformational transitions is reported. Actuation is believed to be the result of conformational rearrangement of the polymer backbone at the molecular level, not simply ion intercalation in the bulk polymer chain upon electrochemical activation. Molecular actuation results from &pgr;-&pgr; stacking of thiophene oligomers upon oxidation, producing a reversible molecular displacement that leads to surprising material properties, such as electrically controllable porosity and large strains. The existence of active molecular conformational changes is supported by in situ electrochemical data. Single molecule techniques have been used to characterize the molecular actuators.
The synthesis of thiophene based conducting polymer molecular actuators, exhibiting electrically triggered molecular conformational transitions is reported. Actuation is believed to be the result of conformational rearrangement of the polymer backbone at the molecular level, not simply ion intercalation in the bulk polymer chain upon electrochemical activation. Molecular actuation results from π-π stacking of thiophene oligomers upon oxidation, producing a reversible molecular displacement that leads to surprising material properties, such as electrically controllable porosity and large strains. The existence of active molecular conformational changes is supported by in situ electrochemical data. Single molecule techniques have been used to characterize the molecular actuators.
[EN] MOLECULAR ACTUATORS, AND METHODS OF USE THEREOF<br/>[FR] ACTIONNEURS MOLÉCULAIRES ET LEURS PROCÉDÉS D'UTILISATION
申请人:——
公开号:WO2003101955A3
公开(公告)日:2004-10-28
Design of reversible organic–organometallic multi-redox systems using thianthrene having ferrocene fragments
作者:Satoshi Ogawa、Hiroki Muraoka、Ryu Sato
DOI:10.1016/j.tetlet.2006.02.062
日期:2006.4
1-Ferrocenyl- and 1,9-diferrocenyl-thianthrenes have been synthesized by using palladium-catalyzed cross-coupling reactions of 1-bromo- and 1,9-dibromo-thianthrenes with ferrocenylzinc chloride. The structure of 1-ferrocenylthianthrene was determined by X-ray crystallographic analysis. 1-Ferrocenyl- and 1,9-diferrocenyl-thianthrenes show well-defined separated two-steps two-electrons and three-steps three-electrons reversible redox waves derived from the ferrocenium cation and the thianthrene radical cation, respectively, by the cyclic voltammetry in dichloromethane containing the supporting electrolyte anion of [B(C6F5)(4)](-). (c) 2006 Elsevier Ltd. All rights reserved.
A Convenient Preparation of Sterically Crowded 1,9-Disubstituted Dibenzothiophenes and 3,3'-Disubstituted Diaryl Sulfides
Thianthrene-5-oxide (1) reacted with 2.2 equivalents of lithium diisopropylamide to give 4,6-dilithiated 1 which was converted to 4,6-disubstituted thianthrene-5-oxides (3). 3 afforded sterically crowded 1,9-disubstituted dibenzothiophenes (4) in moderate yields on treatment with n-butyllithium or phenyllithium.