Recent Development of Organic Conductors Containing Selenium Atoms:New Synthetic Methods,Electron Donors,and Conductors

摘要

The recent development of selenium-containing tetrathiafulvalene (TTF)-type electron donors is described,in terms of the synthetic chemistry and thus developed new electron donors and (super) conductors.Introduction of two breakthrough reactions,the one-pot preparation of 1,3-dichalcogenole-2-chalcogenones from terminal alkynes and the formation of heterocyclic rings via transalkylation on a chalcogen atom,has made it possible,in combination with conventional trialkyl phosphite-promoted coupling reaction,to synthesize various selenium-containing TTF-type electron donors.In particular,the synthetic method is very useful for the synthesis of various tetraselenafulvalene (TSF) derivatives so far inaccessible.Such new electron donors include methylenedithiotetraselenafulvalene (MDT-TSF) and methylenedithiodiselenadithiafulva-lene (MDT-ST),both of which produce a series of unique organic superconductors with T_c= 3.2-5.5 K.