784169-47-7Relevant academic research and scientific papers
Trismaleimide Dendrimers: Helix-to-Superhelix Supramolecular Transition Accompanied by White-Light Emission
Li, Fen,Li, Xiaohui,Wang, Ying,Zhang, Xin
, p. 17994 - 18002 (2019)
Reported here are unprecedented fluorescent superhelices composed of primary, supramolecular polymers of the opposite helical twist. A new class of functional dendrimers was synthesized by amino-ene click reactions, and they demonstrate an alternating OFF/ON fluorescence with generation growth. A peripherally alkyl-modified dendrimer displays helix-sense-selective supramolecular polymerization, which predominantly forms right-handed (or left-handed) helical supramolecular polymers in the solution containing chiral solvents. With increasing the concentration, these primary helical supramolecular polymers spontaneously twist around themselves in the opposite direction to form superhelical structures. Atomic force microscopy and circular dichroism measurements were used to directly observe the helix-to-superhelix transition occurring with a reversal in the helical direction. Exceptional white-light emission was observed during superhelix formation.
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 (2007/10/03)
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
