784169-58-0Relevant academic research and scientific papers
Multi-maleimides bearing electron-donating chromophores: Reversible fluorescence and aggregation behavior
Zhang, Xin,Li, Zi-Chen,Li, Kai-Bo,Du, Fu-Sheng,Li, Fu-Mian
, p. 12200 - 12201 (2004)
A(=)-D, [A(=)]2-D and [A (=)]3-D multi-maleimides and multi-itaconimides bearing electron-donating chromophores display a strong fluorescence quenching due to an intramolecular charge-transfer interaction. The electron-accepting C=C bond plays a key role in the intramolecular quenching. For the isomerization of these multi-itaconimides and Michael additions of these multi-maleimides, their emission behavior is irreversible. For the Diels-Alder additions of these multi-maleimides, their emission behavior is reversible due to the reversible opening and closing of intramolecular charge-transfer pathway. Tris-maleimide TMPA peripherally modified with furfural alcohol displays not only reversible fluorescence behavior but also reversible aggregation behavior. Copyright
Dynamic dye emission ON/OFF systems by a furan moiety exchange protocol
Gong, Junbo,Wang, Ying,Zhang, Qi,Zhang, Xin
, (2020/09/21)
Four triphenylamine-based dyes were synthesized by fluorescence turn on reactions. Optical behaviours, molecular arrangements, donor-to-acceptor charge transfer and dipole interactions of these functional dyes were investigated by UV–vis absorption and fluorescence spectroscopy, single-crystal X-ray diffraction and electrochemical cyclic voltammetry. The irreversible isomerization of itaconimide dye leads to an irreversible emission switch ON to OFF. Reversible Diels-Alder reaction of these dyes lead to a reversible emission switch OFF/ON. These luminescent dyes demonstrate dynamic dye molecular features by furan moiety exchanges to form energy-minimized and optimized dye molecular structures. In the dynamic molecular system, α-position furan-substituted dye was converted into more stable β-position furan-substituted dye according to 1H NMR spectroscopic monitoring.
