Synthetic Control of Spectroscopic and Photophysical Properties of Triarylborane Derivatives Having Peripheral Electron-Donating Groups

2014 ◽  
Vol 20 (14) ◽  
pp. 3940-3953 ◽  
Author(s):  
Akitaka Ito ◽  
Kazuyoshi Kawanishi ◽  
Eri Sakuda ◽  
Noboru Kitamura
Keyword(s):  
Photophysical Properties ◽  
Synthetic Control ◽  
Electron Donating Groups

Synthetic Control on Structure/Dimensionality and Photophysical Properties of Low Dimensional Organic Lead Bromide Perovskite

2018 ◽  
Vol 57 (21) ◽  
pp. 13443-13452 ◽  
Author(s):  
Muhammed P. U. Haris ◽  
Rangarajan Bakthavatsalam ◽  
Samir Shaikh ◽  
Bhushan P. Kore ◽  
Dhanashree Moghe ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Synthetic Control ◽  
Lead Bromide ◽  
Organic Lead ◽  
Low Dimensional

scholarly journals How to Manipulate Through-Space Conjugation and Clusterolumi-nescence of Simple AIEgens with Isolated Phenyl Rings?

2021 ◽  
Author(s):  
Jianyu Zhang ◽  
lianrui hu ◽  
Kaihua Zhang ◽  
Junkai LIU ◽  
Xingguang Li ◽  
...  
Keyword(s):  
Photoinduced Electron Transfer ◽  
Recent Observation ◽  
Photophysical Properties ◽  
Electron Transfer Process ◽  
Electronic Density ◽  
Important Interaction ◽  
Phenyl Rings ◽  
Intramolecular Motion ◽  
Electron Donating Groups ◽  
Theoretical Results

<a>Apart from the traditional through-bond conjugation (TBC), through-space conjugation (TSC) is gradually proved as another important interaction in photophysical processes, especially for the recent observation of clusteroluminescence from nonconjugated molecules. </a>Herein, <a>simple and nonconjugated triphenylmethane (TPM) and its derivatives with electron-donating and electron-withdrawing groups were synthesized</a>, and their photophysical properties were systematically studied. <a>TPM was characterized with visible clusteroluminescence due to the intramolecular TSC. Experimental and theoretical results showed that the introduction of electron-donating groups into TPM could </a><a>red-shift </a>the wavelength and increase the efficiency of clusteroluminescence simultaneously, due to the increased electronic density and stabilization of TSC. However, TPM derivatives with electron-withdrawing groups showed inefficient or even quenched clusteroluminescence caused by the vigorous excited-state intramolecular motion and intermolecular photoinduced electron transfer process. This work provides a reliable strategy to manipulate TSC and clusteroluminescence.

Comparative Charge Transfer Studies of Porphyrin-Fullerene Dyads: Substituents Effect

2020 ◽  
Vol 20 (6) ◽  
pp. 3437-3447 ◽  
Author(s):  
Neha Gupta ◽  
Samya Naqvi ◽  
Nikita Vasistha ◽  
Mahesh Kumar ◽  
Rachana Kumar
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Separation Efficiency ◽  
Photophysical Properties ◽  
Conductivity Measurement ◽  
Transient Absorption Spectroscopy ◽  
Electrical Conductivity Measurement ◽  
Conductivity Enhancement ◽  
Quenching Efficiency ◽  
Electron Donating Groups

The present study deals with the study of charge transfer and photophysical properties of synthesized non-metallated fullerene-porphyrin dyad-III (H2P3-C60) via Prato reaction. The porphyrin has been substituted with electron donating groups (3,5-di-tert-butylbenzene) at meso positions facilitating the effective charge transfer for the formation of long lived charge-separated states in dyad molecule. The photophysical and thermal activated conducting properties of dyad was comprehensively studied to establish the effect of substituents and also by comparing with our reported dyad II having only meso-phenyl groups. The charge separation efficiency in dyad III has been calculated in solution as well as in films showing 62% and ˜99% quenching efficiency respectively suggesting faster photoinduced charge transfer from porphyrin to fullerene moiety. Transient absorption spectroscopy (TAS) showed formation of longer lived charge separated states in solution as well as in films compared to dyad-II. The thermal activated electrical conductivity measurement of dyad-III showed conductivity enhancement on increasing temperature. The activation energy for conduction was also found lower than dyad-II suggesting a substantial effect of electron-donating groups present on porphyrin ring in conducting behavior of dyad-III. Through this study with a very simple dyad structure we established that the presence of electron donating groups in dayds, highly influence photophysical and electronic properties. This special characteristic further makes them potential material to be used in various opto-electronic applications.

scholarly journals How to Manipulate Through-Space Conjugation and Clusterolumi-nescence of Simple AIEgens with Isolated Phenyl Rings?

2021 ◽  
Author(s):  
Jianyu Zhang ◽  
lianrui hu ◽  
Kaihua Zhang ◽  
Junkai LIU ◽  
Xingguang Li ◽  
...  
Keyword(s):  
Photoinduced Electron Transfer ◽  
Recent Observation ◽  
Photophysical Properties ◽  
Electron Transfer Process ◽  
Electronic Density ◽  
Important Interaction ◽  
Phenyl Rings ◽  
Intramolecular Motion ◽  
Electron Donating Groups ◽  
Theoretical Results

<a>Apart from the traditional through-bond conjugation (TBC), through-space conjugation (TSC) is gradually proved as another important interaction in photophysical processes, especially for the recent observation of clusteroluminescence from nonconjugated molecules. </a>Herein, <a>simple and nonconjugated triphenylmethane (TPM) and its derivatives with electron-donating and electron-withdrawing groups were synthesized</a>, and their photophysical properties were systematically studied. <a>TPM was characterized with visible clusteroluminescence due to the intramolecular TSC. Experimental and theoretical results showed that the introduction of electron-donating groups into TPM could </a><a>red-shift </a>the wavelength and increase the efficiency of clusteroluminescence simultaneously, due to the increased electronic density and stabilization of TSC. However, TPM derivatives with electron-withdrawing groups showed inefficient or even quenched clusteroluminescence caused by the vigorous excited-state intramolecular motion and intermolecular photoinduced electron transfer process. This work provides a reliable strategy to manipulate TSC and clusteroluminescence.

Small Molecules as Long-Wavelength Fluorophores: Push-Pull Substituted 4-Alkoxy-1,3-thiazoles

Synthesis ◽  
2017 ◽  
Vol 50 (02) ◽  
pp. 303-313 ◽  
Author(s):  
Rainer Beckert ◽  
Stefanie Habenicht ◽  
Philip Rohland ◽  
Jeaninne Reichel ◽  
Tarita Biver ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fluorescence Spectroscopy ◽  
Small Molecules ◽  
Knoevenagel Condensation ◽  
Photophysical Properties ◽  
Long Wavelength ◽  
Condensation Products ◽  
Electron Donating Groups

A series of donor-π-acceptor (D-π-A) substituted 4-hydroxythiazoles have been synthesized. Electron-donating groups (4-methoxyphenyl and 4-dimethylaminophenyl) were installed in the 5-position of the thiazole; thiophene/pyridine-bridged acceptors (formyl groups and their Knoevenagel condensation products) were placed in the 2-position. The influence of D-π-A character on the photophysical properties and electronic structure was investigated by means of UV/Vis and fluorescence spectroscopy.

A theoretical study on tuning the electronic structures and photophysical properties of newly designed platinum(ii) complexes by adding substituents on functionalized ligands as highly efficient OLED emitters

2014 ◽  
Vol 43 (17) ◽  
pp. 6500-6512 ◽  
Author(s):  
Luqiong Zhang ◽  
Li Tian ◽  
Ming Li ◽  
Rongxing He ◽  
Wei Shen
Keyword(s):  
Electronic Structures ◽  
Theoretical Study ◽  
Photophysical Properties ◽  
Highly Efficient ◽  
Functionalized Ligands ◽  
Electron Donating Groups

Adding strong π-accepting and electron-donating groups could stabilize MLCT and improve the photophysical properties in platinum(ii) complexes.

Solvent Dependence of Structural Dynamics and Spin-flip Processes in 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (ortho-3CzBN)

2020 ◽  
Author(s):  
Masaki Saigo ◽  
Kiyoshi Miyata ◽  
Hajime Nakanotani ◽  
Chihaya Adachi ◽  
Ken Onda
Keyword(s):  
Dft Calculations ◽  
Excited States ◽  
Structural Changes ◽  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Solvent Dependence ◽  
Acetonitrile Solutions

We have investigated the solvent-dependence of structural changes along with intersystem crossing of a thermally activated delayed fluorescence (TADF) molecule, 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (o-3CzBN), in toluene, tetrahydrofuran, and acetonitrile solutions using time-resolved infrared (TR-IR) spectroscopy and DFT calculations. We found that the geometries of the S1 and T1 states are very similar in all solvents though the photophysical properties mostly depend on the solvent. In addition, the time-dependent DFT calculations based on these geometries suggested that the thermally activated delayed fluorescence process of o-3CzBN is governed more by the higher-lying excited states than by the structural changes in the excited states.<br>

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