Room-Temperature Long-Lived Triplet Excited States of Naphthalenediimides and Their Applications as Organic Triplet Photosensitizers for Photooxidation and Triplet–Triplet Annihilation Upconversions

2012 ◽  
Vol 77 (8) ◽  
pp. 3933-3943 ◽  
Author(s):  
Song Guo ◽  
Wanhua Wu ◽  
Huimin Guo ◽  
Jianzhang Zhao
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Triplet Excited States ◽  
Triplet Triplet Annihilation

scholarly journals Persistent Organic Room-Temperature Phosphorescence in Cyclohexane-Trans-1,2-Bisphthalimide Derivatives: The Dramatic Impact of Heterochiral vs. Homochiral Interactions

2020 ◽  
Author(s):  
Ludovic Favereau ◽  
Cassandre Quinton ◽  
Cyril Poriel ◽  
Thierry Roisnel ◽  
Denis Jacquemin ◽  
...  
Keyword(s):  
Excited States ◽  
Intermolecular Interactions ◽  
Room Temperature ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence ◽  
Significant Interest ◽  
New Strategy ◽  
Triplet Excited States ◽  
The Impact ◽  
Triplet Excitons

Persistent metal-free Room-Temperature Phosphorescence (RTP) materials attract significant interest owing to the production of long-lived triplet excited states. Although several organic designs show RTP, the impact of intermolecular interactions on the triplet excitons stabilization and migrations remains hardly understood because obtaining different ordered intermolecular interactions while conserving identical molecular electronic properties is very challenging. We propose here a new strategy to circumvent this problem by taking advantage of the distinct molecular packing that can be found between enantiomer and racemic forms of a chiral molecule. Structural, photophysical and chiroptical investigations of chiral cyclohexane bisphthalimide derivatives showed that heterochiral and homochiral dimer interactions play a crucial role on the triplet excited state stabilization, resulting in higher RTP efficiency for enantiopure systems than for racemic one. This study paves the way to the use of molecular chirality to rationalize supramolecular properties arising from subtle intermolecular interactions.<br>

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