Proaromatic pyranylidene chalcogen analogues and cyclopenta[ c ]thiophen-4,6-dione as electron donors and acceptor in efficient charge-transfer chromophores
Fifteen new push-pull chromophores based on a proaromatic pyranylidene donor and its chalcogen analogues and various electron acceptor moieties were synthesized in a straightforward manner. These model molecules were designed and prepared to investigate the concept of proaromaticity as a tool to tune the fundamental properties of push-pull systems. All target chromophores with systematically varied
Synthesis of electron donor–acceptor polyunsaturated methylenepyran Fischer type carbene complexes: dynamic 1H-NMR study and solvatochromic properties
作者:F Robin-Le Guen、P Le Poul、B Caro、R Pichon、N Kervarec
DOI:10.1016/s0022-328x(00)00940-2
日期:2001.4
Condensation of α and γ methylenepyran aldehydes with the Fischer carbene complexes (CO)5MC(OCH3)Me (M=Cr, W) or (CO)5WC(OCH3)CHCH–CH3 in the presence of ClSiMe3/NEt3 yield donor acceptor complexes, in which the electron donating group is connected to the organometallic accepting group by a conjugated ethylenic spacer. 1H- and 13C-NMR studies, suggest that the carbene fragment and the unsaturated chain lie
push-pull organic dyes incorporating a cyanoacrylic acid group as electron acceptor unit and α-chalcogenopyranylidene group (X = S; O) as electron donor unit has been synthesized, characterized and used as sensitizer for dye-sensitizedsolarcells (DSSCs). For the first time, α-pyranylidene and thiopyranylidene groups, have been evaluated in DSSC. To obtain the thermodynamic values of the solarcell, an