Issue 35, 2014

The effect of the regioisomeric naphthalimide acetylide ligands on the photophysical properties of N^N Pt(ii) bisacetylide complexes

Abstract

Two N^N Pt(II) bis(acetylide) complexes Pt-1 and Pt-2 with regioisomeric amino NI acetylide ligands (L-1 and L-2, L-1 = 5-amino-4-ethylnaphthaleneimide; L-2 = 3-amino-4-ethylnaphthaleneimide) were prepared. The photophysical properties of the complexes were studied by steady state and time-resolved spectroscopy. The two complexes with regioisomeric ligands (Pt-1 and Pt-2) show different photophysical properties such as maximal absorption wavelength (485 nm vs. 465 nm), triplet excited state lifetimes (23.7 μs vs. 0.9 μs), and different solvent-polarity dependences of the emission properties. The absorption of the complexes is red-shifted as compared with the previously reported Pt(II) complex containing the 4-ethylnaphthaleneimide ligand. The two complexes with regioisomeric NI ligands were used as triplet photosensitizers for triplet–triplet annihilation (TTA) upconversion; drastically different upconversion quantum yields (15.0% vs. 1.1%) were observed. Our results are useful for designing new visible light-harvesting Pt(II) bisacetylide complexes as triplet photosensitizers which can be used in areas such as photocatalysis, photodynamic therapy and TTA upconversion.

Graphical abstract: The effect of the regioisomeric naphthalimide acetylide ligands on the photophysical properties of N^N Pt(ii) bisacetylide complexes

Supplementary files

Article information

Article type
Paper
Submitted
11 Jun 2014
Accepted
13 Jul 2014
First published
16 Jul 2014

Dalton Trans., 2014,43, 13434-13444

The effect of the regioisomeric naphthalimide acetylide ligands on the photophysical properties of N^N Pt(II) bisacetylide complexes

L. Liu, C. Zhang and J. Zhao, Dalton Trans., 2014, 43, 13434 DOI: 10.1039/C4DT01732C

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