Photophysical properties and excited state dynamics of 4,7-dithien-2-yl-2,1,3-benzothiadiazole

2017 ◽  
Vol 19 (21) ◽  
pp. 13604-13613 ◽  
Author(s):  
Alessandro Iagatti ◽  
Barbara Patrizi ◽  
Andrea Basagni ◽  
Agnese Marcelli ◽  
Andrea Alessi ◽  
...  
Keyword(s):  
Excited State ◽  
Structural Properties ◽  
Computational Methods ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Excited State Dynamics

The relationships between the photophysics and structural properties of 4,7-dithien-2-yl-2,1,3-benzothiadiazole as a function of solvent polarity are investigated both experimentally and by computational methods.

scholarly journals Controlling the Twisted Intramolecular Charge-Transfer Character of Pyrene Derivatives Through Solvent Polarity

2021 ◽  
Author(s):  
Young Mo Sung ◽  
Eun Suk Kwon ◽  
Yusuke Makida Maruyama ◽  
Youngsik Shin ◽  
Soo-Ghang Ihn ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Structural Changes ◽  
Intramolecular Charge Transfer ◽  
Photophysical Properties ◽  
Critical Role ◽  
Solvent Polarity ◽  
Twisted Intramolecular Charge Transfer ◽  
Excited State Dynamics ◽  
Pyrene Derivatives

Abstract Intramolecular charge transfer (ICT) plays a critical role in determining the photophysical properties of organic molecules, including their luminescence efficiencies. Twisted intramolecular charge transfer (TICT) is a process in which structural change accompanies ICT. Despite significant research, the relationship between TICT and solvent polarity, and its effects on photophysical properties, have been rarely investigated. Herein, we used time-resolved spectroscopy to study TICT in pyrene derivatives that are promising blue organic light emitting diode (OLED) emitter candidates; these derivatives show strong solvent-dependent charge-transfer (CT) behavior. Slight structural changes that do not affect excited state dynamics were observed in nonpolar solvents, while polar solvents were found to affect excited state dynamics and CT characteristics. The TICT behavior of these pyrene derivatives could be modulated through structural modification. Our study provides valuable guidelines for the control of optical properties, including the luminescence efficiencies of OLED emitters that show TICT characteristics.

scholarly journals Studies on Photophysical Properties of Mono-carbonyl Curcumin Analogues: Experimental and Theoretical approach

2018 ◽  
Vol 34 (4) ◽  
pp. 2170-2179
Author(s):  
Manjula Rayanal ◽  
Prasad Pralhad Pujar ◽  
Sridhar D
Keyword(s):  
Excited State ◽  
Ground State ◽  
Dipole Moments ◽  
Photophysical Properties ◽  
Stokes Shift ◽  
Solvent Polarity ◽  
Frontier Molecular Orbital ◽  
Curcumin Analogues ◽  
Td Dft ◽  
Ground State Dipole Moments

The solvatochromic fluorescence behaviour of mono-carbonyl curcumin analogues has been studied in ten different solvents ranging from non-polar to polar. The solvent effect on the spectral properties of analogues has been discussed. The ground state dipole moments were estimated experimentally by Bilot-Kawski equation which is a function of Stokes shift with the solvent polarity parameters and Guggenheim method and theoretically by TD-DFT studies. The excited state dipole moment was determined using Bilot-Kawski equations. The excited state dipole moments for the two molecules were found to be higher than their corresponding ground state dipole moments. Theoretically Frontier molecular orbital (HOMO/ LUMO) energies were determined by Gaussian 09 W software using TD-DFT.

scholarly journals Excited-State Dynamics of Room-Temperature Phosphorescent Organic Materials Based on Monobenzil and Bisbenzil Frameworks

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3904
Author(s):  
Kaveendra Maduwantha ◽  
Shigeyuki Yamada ◽  
Kaveenga Rasika Koswattage ◽  
Tsutomu Konno ◽  
Takuya Hosokai
Keyword(s):  
Excited State ◽  
Density Functional ◽  
Room Temperature ◽  
Photophysical Properties ◽  
Density Functional Theory Calculations ◽  
Time Resolved ◽  
Excited State Dynamics ◽  
Unique Material ◽  
Potential Applications ◽  
Time Resolved Photoluminescence

Room-temperature phosphorescent (RTP) materials have been attracting tremendous interest, owing to their unique material characteristics and potential applications for state-of-the-art optoelectronic devices. Recently, we reported the synthesis and fundamental photophysical properties of new RTP materials based on benzil, i.e., fluorinated monobenzil derivative and fluorinated and non-fluorinated bisbenzil derivative analogues [Yamada, S. et al., Beilstein J. Org. Chem. 2020, 16, 1154–1162.]. To deeply understand their RTP properties, we investigated the excited-state dynamics and photostability of the derivatives by means of time-resolved and steady-state photoluminescence spectroscopies. For these derivatives, clear RTP emissions with lifetimes on the microsecond timescale were identified. Among them, the monobenzil derivative was found to be the most efficient RTP material, showing both the longest lifetime and highest amplitude RTP emission. Time-resolved photoluminescence spectra, measured at 77 K, and density functional theory calculations revealed the existence of a second excited triplet state in the vicinity of the first excited singlet state for the monobenzil derivative, indicative of the presence of a fast intersystem crossing pathway. The correlation between the excited state dynamics, emission properties, and conformational flexibility of the three derivatives is discussed.

scholarly journals Effect of solvent polarity on the photophysical properties of chalcone derivatives

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 24204-24214 ◽  
Author(s):  
Rekha Kumari ◽  
Anitha Varghese ◽  
Louis George ◽  
Sudhakar Y. N.
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Ground State ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Chalcone Derivatives ◽  
Effect Of Solvent

The photophysical properties were studied for FNPO, AFPO and FHPO in different organic solvents. The excited state of the molecules were found to be more polar than the ground state.

Photophysical Investigation of 8-amino 2-Naphthol in Different Micellar Environment

2019 ◽  
Author(s):  
Richa Gahlaut ◽  
Pramod Pandey ◽  
Priyanka Arora ◽  
Kalpana Tiwari ◽  
Neeraj K. Joshi ◽  
...  
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Proton Acceptor ◽  
Oh Groups ◽  
Homogeneous Environment

*8-amino 2-naphthol (8A2NP) is an interesting molecule containing both proton acceptor (-NH<sub>2</sub>) and proton donating (-OH) groups. Our earlier investigation on the photophysics / photochemistry of 8A2NP reveals that its prototropic behavior is sensitive to the solvent polarity and pH. Interesting photophysical properties of 8A2NP in homogeneous environment prompting towards the study of the said probe in in different surfactants<b>.</b> In the present work, 8A2NP has been studied in cationic (CTAB), anionic (SDS) and non-ionic (TX-100) surfactants and changes in the excited state deactivation are explored in the mentioned surfactants

Framework induced deformation modulates the photophysical properties of ZnTetra(4-pyridyl)porphyrin incorporated within a new metal organic framework, RWLAA-1

2020 ◽  
Vol 49 (33) ◽  
pp. 11668-11674
Author(s):  
Abdulaziz A. Alanazi ◽  
Lukasz Wojtas ◽  
Jacob M. Mayers ◽  
Jaroslava Miksovska ◽  
Randy W. Larsen
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Excited State Dynamics ◽  
Metal Organic ◽  
Organic Framework

Porphyrin deformation in the new metal organic framework RWLAA-1 modulates the photohysical properties of the material specifically by limiting excited state dynamics.

Synthesis and Photophysical Properties of Laterally Asymmetric Digold(I) Alkynyls and Triazolyl: Ancillary Ligand and Organic Functionality Dictate Excited-State Dynamics

2020 ◽  
Vol 39 (4) ◽  
pp. 489-494 ◽  
Author(s):  
Joseph J. Mihaly ◽  
Alexis T. Phillips ◽  
Jacob T. Malloy ◽  
Zachary M. Marsh ◽  
Matthias Zeller ◽  
...  
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Ancillary Ligand ◽  
Excited State Dynamics

Strong Fluorescent Lanthanide Salen Complexes: Photophysical Properties, Excited-State Dynamics, and Bioimaging

2018 ◽  
Vol 58 (3) ◽  
pp. 1806-1814 ◽  
Author(s):  
Yuhang Yao ◽  
Hao-Yan Yin ◽  
Yingying Ning ◽  
Jian Wang ◽  
Yin-Shan Meng ◽  
...  
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Excited State Dynamics ◽  
Salen Complexes

scholarly journals Excited state dynamics of BODIPY-based acceptor–donor–acceptor systems: a combined experimental and computational study

2021 ◽  
Vol 23 (14) ◽  
pp. 8900-8907
Author(s):  
Zimu Wei ◽  
Sushil Sharma ◽  
Abbey M. Philip ◽  
Sanchita Sengupta ◽  
Ferdinand C. Grozema
Keyword(s):  
Excited State ◽  
Computational Study ◽  
Solvent Polarity ◽  
Excited State Dynamics ◽  
Sensing Applications ◽  
Boron Dipyrromethene ◽  
Donor Acceptor

Donor-bridge-acceptor systems based on boron dipyrromethene (BODIPY) are attractive candidates for bio-imagining and sensing applications because of their sensitivity to temperature, micro-viscosity and solvent polarity.

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