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Issue 40, 2019
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The effects of extended π-conjugation in bipyridyl ligands on the tunable photophysics, triplet excited state and optical limiting properties of Pt(ii) naphthalimidyl acetylide complexes

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Abstract

Pt(II) complexes that exhibit long-lived triplet excited state lifetimes are promising for optical power limiting materials. The introduction of large π-conjugated substituents can switch the triplet excited state to a long-lived 3π,π* state. Herein, we report four Pt(II) diimine complexes with high π-conjugation via inserting an aryl group on the diimine ligand. Their photophysical properties were investigated using spectroscopic techniques. All the complexes exhibit strong ground absorption bands in their UV-Vis absorption spectra (maximum peaks ranging from 370 to 530 nm) and long-lived emission and triplet excited states. The insertion of π-conjugated substituents induces a pronounced red-shift in the ground state absorption and longer emission lifetime. Broadband transient absorption spectra in the visible-NIR region and Z-scan properties under 532 nm were carried out on the Pt(II) diimine complexes, resulting in a remarkably strong reverse saturable absorption at 532 nm for nanosecond laser pulses. Otherwise, the high π-conjugation in the bipyridyl ligand increases the reverse saturable absorption. Therefore, these Pt(II) diimine complexes with high π-conjugation are excellent candidates for devices that require strong reverse saturable absorption.

Graphical abstract: The effects of extended π-conjugation in bipyridyl ligands on the tunable photophysics, triplet excited state and optical limiting properties of Pt(ii) naphthalimidyl acetylide complexes

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Publication details

The article was received on 20 Jun 2019, accepted on 23 Sep 2019 and first published on 23 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT02595B
Dalton Trans., 2019,48, 15105-15113

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    The effects of extended π-conjugation in bipyridyl ligands on the tunable photophysics, triplet excited state and optical limiting properties of Pt(II) naphthalimidyl acetylide complexes

    S. Zhu, H. Liu, K. Wang, Q. Cheng, Z. Ma, R. Liu, G. Song and H. Zhu, Dalton Trans., 2019, 48, 15105
    DOI: 10.1039/C9DT02595B

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