Organic luminescent materials hold significant promise for applications in modern technology.Traditionally,their design has been guided byπ-conjugation theory.However,the recent discovery of weak interactions-based l...Organic luminescent materials hold significant promise for applications in modern technology.Traditionally,their design has been guided byπ-conjugation theory.However,the recent discovery of weak interactions-based luminescent materials,such as multiarylalkanes(MAAs),has challenged this paradigm.Emerging research suggests that these materials emit light from through-space conjugation(TSC),includingπ-π,n-π,and n-n TSC.Owing to their well-defined structures and facile chemical modification,MAAs serve as ideal models for investigating TSC.This review systematically examines the mechanisms of TSC in these systems from three key perspectives:conformational regulation,donor-acceptor(D-A)and n-electronic modulation.Studies on their photophysical processes reveal that conformational control and D-A electronic modulation predominantly influence emission throughπ-πTSC.In contrast,tuning the n-electron structure,particularly involving lone pair electrons on nitrogen atoms,introduces n-πand n-n TSC,enabling red-shifted emission and enhanced luminescence efficiency.By providing a comprehensive analysis of TSC in MAAs,this review refines the current understanding of TSC-based luminescence and offers valuable design principles for developing novel,highly efficient,weak interactions-based luminescent materials.展开更多
基金Project supported by the National Natural Science Foundation of China(No.22205197)。
文摘Organic luminescent materials hold significant promise for applications in modern technology.Traditionally,their design has been guided byπ-conjugation theory.However,the recent discovery of weak interactions-based luminescent materials,such as multiarylalkanes(MAAs),has challenged this paradigm.Emerging research suggests that these materials emit light from through-space conjugation(TSC),includingπ-π,n-π,and n-n TSC.Owing to their well-defined structures and facile chemical modification,MAAs serve as ideal models for investigating TSC.This review systematically examines the mechanisms of TSC in these systems from three key perspectives:conformational regulation,donor-acceptor(D-A)and n-electronic modulation.Studies on their photophysical processes reveal that conformational control and D-A electronic modulation predominantly influence emission throughπ-πTSC.In contrast,tuning the n-electron structure,particularly involving lone pair electrons on nitrogen atoms,introduces n-πand n-n TSC,enabling red-shifted emission and enhanced luminescence efficiency.By providing a comprehensive analysis of TSC in MAAs,this review refines the current understanding of TSC-based luminescence and offers valuable design principles for developing novel,highly efficient,weak interactions-based luminescent materials.
