Yadav, Rahul Kumar and Parveen, Darakshan and Mondal, Bijan and Roy, Dipak Kumar (2025) The Role of Spacers as a Probe in Variation of Photoluminescence Properties of Mono- and Bi-Nuclear Boron Compounds. CHEMISTRY-AN ASIAN JOURNAL, 20 (1): e202401113. ISSN 1861-4728, 1861-471X
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A series of N,O donor-based mono- and binuclear four-coordinated boron complexes were synthesized. Depending on the substitution and spacer, these complexes exhibit intense blue, green and yellow emission in solution states. Notably, the fluorescence quantum yields (Phi(F)) and fluorescence decay (lifetime, tau) of mononuclear boron complexes (2a-2e) were higher than the binuclear boron complexes (2f-2k). The lowest lifetime and quantum yield in binuclear boron complexes were due to intramolecular rotation induced non radiative processes. The disulphide spacer-based boron complexes 2i-2k showed aggregation-caused quenching in the THF/H2O mixture whereas no other complexes were ACQ responsive. These complexes show large Stokes shift, one of them i.e. 2e has the highest Stokes shift of 130nm. Further, the electrochemical study suggests the presence of two redox incidences. Theoretical studies show close corroboration between the TD-DFT computed and experimentally measured absorption maxima as well as DFT (GIAO) calculated and experimentally measured B-11 NMR values. This complements the appropriate selection of the theoretical methods to shed light on the electronic transitions in the mono- and binuclear BF2 complexes.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COPPER(II) COMPLEXES; HIGHLY FLUORESCENT; BODIPY DYES; BASIS-SETS; EMISSION; SUBPHTHALOCYANINES; FUNCTIONALS; DENSITY; MODEL; Aggregate caused quenching; Boron; DFT studies; Fluorescence; Large Stokes shift |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Mar 2026 06:59 |
| Last Modified: | 17 Mar 2026 06:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64262 |
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