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B–N coordinated triaryl pyrazole: effect of dimerization, and optical and NLO properties

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Abstract

A series of triaryl pyrazole B ← N coordinate dimers with different π-conjugated (spacer) bridges (compound 4 (no spacer); compound 7 (2,5-bis(hexyloxy)benzene); compound 8 (9,9-dihexyl-9H-fluorene); compound 9 (9-hexyl-9H-carbazole); compound 10 (thiophene); compound 11 (2,2′-bithiophene)) has been synthesized from simple triaryl pyrazoles. Three different synthetic protocols were applied to synthesize the desired B ← N coordinate pyrazole dimers. All the B ← N coordinate pyrazole dimers exhibit absorption maxima between 337 and 399 nm with good molar absorption coefficients (12 000 to 22 100 M−1 cm−1 in CH2Cl2). They are highly emissive in the solution state with quantum yields of up to 0.94. Due to a substantial change in the excited state dipole moment, B ← N coordinate pyrazole dimers exhibit versatile and appreciably large nonlinear optical (NLO) properties. The dimer symmetry and the presence of donor or acceptor moieties affect the two-photon-absorption (TPA) cross-section substantially. In addition, the investigation reveals that the dimer π-conjugation length in all dimer variants has a remarkable impact on the NLO characteristics.

Graphical abstract: B–N coordinated triaryl pyrazole: effect of dimerization, and optical and NLO properties

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Publication details

The article was received on 06 Aug 2019, accepted on 19 Sep 2019 and first published on 19 Sep 2019


Article type: Paper
DOI: 10.1039/C9TC04309H
J. Mater. Chem. C, 2019, Advance Article

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    B–N coordinated triaryl pyrazole: effect of dimerization, and optical and NLO properties

    V. Mukundam, S. Sa, A. Kumari, R. Das and K. Venkatasubbaiah, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC04309H

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