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Najare MS, Patil MK, Tilakraj TS, Yaseen M, Nadaf AA, Mantur S, Inamdar SR, Khazi IAM. Photophysical and Electrochemical Properties of Highly π-Conjugated Bipolar Carbazole-1,3,4-Oxadiazole-based D-π-A Type of Efficient Deep Blue Fluorescent Dye. J Fluoresc 2021; 31:1645-1664. [PMID: 34379233 DOI: 10.1007/s10895-021-02778-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 07/05/2021] [Indexed: 11/26/2022]
Abstract
In this contribution, we have designed and synthesized a novel carbazole-1,3,4-oxadiazole based bipolar fluorophore (E)-2-(4-(4-(9H-carbazol-9-yl)styryl)phenyl)-5-(4-(tertbutyl) phenyl)-1,3,4-oxadiazole (CBZ-OXA-IV). Wittig reaction is utilised for the synthesis of the designed bipolar target compound CBZ-OXA-IV. 1H NMR, 13C NMR, FT-IR and ESI-MS results confirmed the designed chemical structure of the fluorophore CBZ-OXA-IV. The photophysical properties have been investigated in detail using UV-Vis absorption, photoluminescence spectroscopy. Also, the photoluminescence studies on solid state samples (as thin films) were carried out. The CBZ-OXA-IV dye emits intense deep blue fluorescence with observed absorption and emission maxima occurring are at 353 nm and 470 nm, respectively. Fluorophore CBZ-OXA-IV has shown high Stokes shift of 7052 cm-1. The experimentally measured optical band gap ([Formula: see text]) value is found to be 3.01 eV and the fluorescence quantum yields (Φf) is 0.40. The intramolecular charge transfer property of CBZ-OXA-IV dye was examined by using photophysical properties such as absorption, emission in different solvents of different varying polarities. In addition, Density Functional Theory computations are studied in detail including the MEP surface plots and natural bond orbital analysis. The electrochemical properties have been investigated in detail by using cyclic voltammetry measurements. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) measurement results display a high thermal stability with decomposition temperature (Td5%) 387 °C and a large glass transition temperature (Tg) of 98 °C. The obtained results demonstrated that the novel bipolar fluorophore CBZ-OXA-IV could play an important role in organic optoelectronics and possibly can be utilized as bipolar transport materials for electroluminescence applications in optoelectronic devices/OLEDs.
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Affiliation(s)
| | - Mallikarjun Kalagouda Patil
- Laser Spectroscopy Programme, Department of Physics, UGC-CPEPA, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Tarimakki Shankar Tilakraj
- Laser Spectroscopy Programme, Department of Physics, UGC-CPEPA, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Mohammed Yaseen
- Department of Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India
| | - AfraQuasar A Nadaf
- Department of Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Shivaraj Mantur
- Department of Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Sanjeev Ramchandra Inamdar
- Laser Spectroscopy Programme, Department of Physics, UGC-CPEPA, Karnatak University, Dharwad, 580003, Karnataka, India
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Martínez-Lara F, Suárez A, Suárez-Pantiga S, Tapia MJ, Sanz R. Straight access to highly fluorescent angular indolocarbazoles via merging Au- and Mo-catalysis. Org Chem Front 2020. [DOI: 10.1039/d0qo00405g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A straightforward and efficient synthesis of the two less explored types of indolocarbazoles has been developed giving rise to highly fluorescent compounds with fluorescence quantum yields around 0.7.
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Affiliation(s)
| | - Anisley Suárez
- Departamento de Química
- Facultad de Ciencias
- Universidad de Burgos
- 09001-Burgos
- Spain
| | | | - M. José Tapia
- Departamento de Química
- Facultad de Ciencias
- Universidad de Burgos
- 09001-Burgos
- Spain
| | - Roberto Sanz
- Departamento de Química
- Facultad de Ciencias
- Universidad de Burgos
- 09001-Burgos
- Spain
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Daniels M, de Jong F, Vandermeeren T, Van Meervelt L, Van der Auweraer M, Dehaen W. Bay-Substituted Thiaza[5]helicenes: Synthesis and Implications on Structural and Spectroscopic Properties. J Org Chem 2019; 84:13528-13539. [PMID: 31545047 DOI: 10.1021/acs.joc.9b01793] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of bay-substituted thiaza[5]helicenes was synthesized to investigate the effect of different substituents on the properties of these helicenes. These thiaza[5]helicenes with different substituents were prepared in a straightforward manner through indole- and benzo[b]thiophene synthesis, palladium-catalyzed Suzuki coupling, oxidative cyclization, and functional group interconversion reactions. We investigated the impact of these different bay area substituents compared to the unsubstituted thiaza[5]helicene on the structural parameters and studied the steady-state electronic spectroscopy of these thiaza[5]helicenes in toluene and acetonitrile. We found that different functional groups influence the solid state structure and spectroscopic properties, but a single substituent in the bay area of a thiaza[5]helicene was not enough to prevent enantiomerization at room temperature.
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