Synthesis and photophysical investigations of pyridine-pyrazolate bound boron(III) diaryl complexes

Rashid Javaid*, Aziz Ul Rehman, Manan Ahmed, Mohammad Hashemi Karouei, Nima Sayyadi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
48 Downloads (Pure)

Abstract

This study presents the design and synthetic pathway of unsymmetric ligands based on pyridine-pyrazolate scaffold with Donor–Acceptor (D–A) molecular arrays and their boron complexes to achieve a large Stokes shift. Intermolecular charge transfer (ICT) triggered by the uneven molecular charge distribution from electronically dense pyrazolate (donor) part of the ligands to electron-deficient boron centre (acceptor) resulted in a mega Stokes shift up to 263 nm for selected compounds while retaining the characteristic quantum efficiency and chemical stability. The photophysical properties of derivatization of pyrazolate group in the pyridine-pyrazolate scaffold of diaryl boron complexes were explored based on UV–Visible, steady-state and time-resolved fluorescence spectroscopy. An interesting dual emission along with quenching behaviour was also observed for 2-(6-methoxynaphthelene) 5-(2-pyridyl) pyrazolate boron complex (P5) due to the formation of a twisted intermolecular charge transfer (TICT) state from a locally excited (LE) state rendering it a potential candidate for sensing applications based on H-Bond quenching. In addition, the extended excited state lifetime of the reported compounds compared to classical boron-dipyrromethene (BODIPY) makes them suitable as potential probes for analytical applications requiring a longer excited state lifetime.

Original languageEnglish
Article number16482
Pages (from-to)1-11
Number of pages11
JournalScientific Reports
Volume12
Issue number1
DOIs
Publication statusPublished - 1 Oct 2022

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Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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