Theoretical Study of the Low-Lying Excited States of Butoxy Radicals and Non-Radiative Decay Routes

2007 ◽  
Vol 25 (10) ◽  
pp. 1467-1473 ◽  
Author(s):  
Ling LIN ◽  
Li-Li ZU ◽  
Wei-Hai FANG ◽  
Jian-Guo YU ◽  
Ruo-Zhuang LIU
Keyword(s):  
Excited States ◽  
Radiative Decay ◽  
Theoretical Study

Theoretical Studies on Phosphorescent Materials: The Conjugation-Extended PtII Complexes

2014 ◽  
Vol 67 (10) ◽  
pp. 1522 ◽  
Author(s):  
Ai-Hua Liang ◽  
Fu-Quan Bai ◽  
Jian Wang ◽  
Jian-Bo Ma ◽  
Hong-Xing Zhang
Keyword(s):  
Charge Transfer ◽  
Decay Rate ◽  
Excited States ◽  
Rate Constants ◽  
Radiative Decay ◽  
Theoretical Study ◽  
Radiative Decay Rate ◽  
Ligand Charge Transfer ◽  
Emission Transition ◽  
Transfer Properties

A theoretical study on the PtII complex A based on a dimesitylboron (BMes2)-functionalized [Pt(C^N)(acac)] (C^N = 2-phenyl-pyridyl, acac = acetylaceton) complex, as well as three conjugation-extended analogues of the methylimidazole (C*) ligand BMes2-[Pt(C^C*)(acac)] complexes B–D is performed. Their theoretical geometries, electronic structures, emission properties, and the radiative decay rate constants (kr) were also investigated. The energy differences between the two highest occupied orbitals with dominant Pt d-orbital components (Δddocc) of D both at the ground and excited states are the smallest of all. Compared with B, the charge transfer in D possesses a marked trend towards the extended conjugated group, while C changed inconspicuously. The lowest-lying absorptions and the phosphorescence of them can be described as a mixed metal-to-ligand charge transfer (MLCT)/intra-ligand π→π* charge transfer (ILCT) and 3MLCT/3ILCT, respectively. The variation of charge transfer properties induced by extended conjugation and the radiative decay rate constants (kr) calculated revealed that D is a more efficient blue phosphorescence material with a 497 nm emission transition.

Restriction of Access to Dark State: A New Mechanistic Model for Heteroatom-Containing AIE Systems

2019 ◽  
Author(s):  
Yujie Tu ◽  
Junkai Liu ◽  
Haoke Zhang ◽  
Qian Peng ◽  
Jacky W. Y. Lam ◽  
...  
Keyword(s):  
Excited States ◽  
Radiative Decay ◽  
Molecular Design ◽  
Mechanistic Model ◽  
Zinc Ion ◽  
Easy Access ◽  
Triplet States ◽  
Dark State ◽  
Ion Probe ◽  
Π State

Aggregation-induced emission (AIE) is an unusual photophysical phenomenon and provides an effective and advantageous strategy for the design of highly emissive materials in versatile applications such as sensing, imaging, and theragnosis. "Restriction of intramolecular motion" is the well-recognized working mechanism of AIE and have guided the molecular design of most AIE materials. However, it sometimes fails to be workable to some heteroatom-containing systems. Herein, in this work, we take more than one excited state into account and specify a mechanism –"restriction of access to dark state (RADS)" – to explain the AIE effect of heteroatom-containing molecules. An anthracene-based zinc ion probe named APA is chosen as the model compound, whose weak fluorescence in solution is ascribed to the easy access from the bright (π,π*) state to the closelying dark (n,π*) state caused by the strong vibronic coupling of the two excited states. By either metal complexation or aggregation, the dark state is less accessible due to the restriction of the molecular motion leading to the dark state and elevation of the dark state energy, thus the emission of the bright state is restored. RADS is found to be powerful in elucidating the photophysics of AIE materials with excited states which favor non-radiative decay, including overlap-forbidden states such as (n,π*) and CT states, spin-forbidden triplet states, which commonly exist in heteroatom-containing molecules.

A Theoretical Study of the Low-Lying Excited States oftrans- andcis-Urocanic Acid

1999 ◽  
Vol 103 (48) ◽  
pp. 9864-9871 ◽  
Author(s):  
Christopher S. Page ◽  
Manuela Merchán ◽  
Luis Serrano-Andrés ◽  
Massimo Olivucci
Keyword(s):  
Excited States ◽  
Theoretical Study ◽  
Urocanic Acid

Experimental and theoretical study of core-excited states of Al III

1990 ◽  
Vol 42 (5) ◽  
pp. 543-550 ◽  
Author(s):  
J O Gaardsted ◽  
T Brage ◽  
C Froese Fischer ◽  
D Sonnek
Keyword(s):  
Excited States ◽  
Theoretical Study

scholarly journals Erratum to: Theoretical Study of the Electronic Excited States and Fluorescence Spectra of Squaraine in Solution

2014 ◽  
Vol 43 (9-10) ◽  
pp. 1644-1644
Author(s):  
Hitoshi Ozawa ◽  
Kazunori Yashiro ◽  
Takuma Yamamoto ◽  
Satoshi Yabushita
Keyword(s):  
Excited States ◽  
Fluorescence Spectra ◽  
Theoretical Study ◽  
Electronic Excited States

Theoretical Study of the Electronic Excited States of Tetracyanoethylene and Its Radical Anion

ChemPhysChem ◽  
2005 ◽  
Vol 6 (3) ◽  
pp. 503-510 ◽  
Author(s):  
Begoña Milián ◽  
Rosendo Pou-Amérigo ◽  
Manuela Merchán ◽  
Enrique Ortí
Keyword(s):  
Excited States ◽  
Radical Anion ◽  
Theoretical Study ◽  
Electronic Excited States
Sign in / Sign up

Export Citation Format

Share Document