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Chin. Phys. B, 2020, Vol. 29(10): 103103    DOI: 10.1088/1674-1056/aba9bb
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Theoretical insights into photochemical ESITP process for novel DMP-HBT-py compound

Guang Yang(杨光)1,†(), Kaifeng Chen(陈凯锋)1, Gang Wang(王岗)1, Dapeng Yang(杨大鹏)2
1 Basic Teaching Department, Jiaozuo University, Jiaozuo 454000, China
2 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
Abstract  

We execute the density functional theory (DFT) and time-dependent density functional theory (TDDFT) approaches to make a detailed exploration about excited state luminescent properties as well as excited state intramolecular proton transfer (ESIPT) mechanism for the novel 2,6-dimethyl phenyl (DMP-HBT-py) system. Firstly, we check and confirm the formation and stabilization of hydrogen bonding interaction for DMP-HBT-py. Via optimized geometrical parameters of primary chemical bond and infrared (IR) spectra, we find O–H⋯N hydrogen bond of DMP-HBT-py should be strengthened in S1 state. Insights into frontier molecular orbitals (MOs) analyses, we infer charge redistribution and charge transfer (ICT) phenomena motivate ESIPT trend. Via probing into potential energy curves (PECs) in related electronic states, we come up with the ultrafast ESIPT behavior due to low potential barrier. Furthermore, we search the reaction transition state (TS) structure, the ultrafast ESIPT behavior and mechanism of DMP-HBT-py compound can be re-confirmed. We sincerely wish this work could play roles in further developing novel applications based on DMP-HBT-py compound and in promoting efficient solid emitters in OLEDs in future.

Keywords:  infrared vibrational spectra      intramolecular charge transfer      potential energy curve      excited state intramolecular proton transfer  
Received:  21 June 2020      Revised:  15 July 2020      Published:  05 October 2020
PACS:  31.15.ee (Time-dependent density functional theory)  
  31.15.ae (Electronic structure and bonding characteristics)  
  31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))  
Corresponding Authors:  Guang Yang(杨光)   
About author: 
†Corresponding author. E-mail: yxd5460@163.com
* Project supported by the Science and Technology Research Project of Henan Province, China (Grant No. 172102210391) and the Higher Vocational School Program for Key Teachers from Department of Education of Henan Province, China (Grant No. 2019GZGG042).

Cite this article: 

Guang Yang(杨光), Kaifeng Chen(陈凯锋), Gang Wang(王岗), Dapeng Yang(杨大鹏) Theoretical insights into photochemical ESITP process for novel DMP-HBT-py compound 2020 Chin. Phys. B 29 103103

Fig. 1.  

View of DMP-HBT-py and its proton-transfer DMP-HBT-py-PT tautomer at B3LYP/TZVP (hexane solvent) level. Red: O atom; blue: H atom; yellow: C atom; violet: N atom; green: S atom.

DMP-HBT-py DMP-HBT-py-PT
S0 S1 S0 S1
O–H 0.9924 1.0211 1.5904 1.7569
H–N 1.7378 1.6180 1.0640 1.0363
δ (O–H–N) 146.6° 151.1° 141.0° 135.6°
Table 1.  

Optimized geometrical parameters (bond length (in unit Å) and bond angle (in unit (°)) of hydrogen bond O–H⋯N of DMP-HBT-py and O⋯H–N of DMP-HBT-py-PT in S0 and S1 states based on the DFT/TDDFT methods with IEFPCM (hexane) model.

Fig. 2.  

Simulated IR spectra for DMP-HBT-py (a) and DMP-HBT-py-PT (b) structures in hexane solvent in S0 and S1 states. (a) The O–H stretching vibrational mode of DMP-HBT-py form. (b) The H–N stretching vibrational mode of DMP-HBT-py-PT structure.

Fig. 3.  

The HOMO and LUMO of DMP-HBT-py compound via TDDFT/B3LYP/TZVP theoretical level. In CDD map, the regions with increased electron densities are shown in violet, whereas those with decreased electron densities are shown in light blue.

Fig. 4.  

The constructed PECs of DMP-HBT-py system via fixing O–H bond length in S0 and S1 states.

Transition λ/nm f Composition CI/%
DMP-HBT-py S0 → S1 417 0.9397 H → L 92.75%
S0 → S2 336 0.14013 H → L + 1 81.45%
H-1 → L 8.28%
Table 2.  

Vertical excitation energies (in unit nm), oscillator strengths (f), and relevant transition composition as well as percentage (%) for DMP-HBT-py compound.

Fig. 5.  

The TS structure for DMP-HBT-py system along with ESIPT path. Herein, the imaginary frequency and its vibrational eigenvector are also shown.

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