Issue 24, 2021

Effects of geometrical isomerism on emissive behaviour of heteroleptic cyclometalated Ir(iii) complexes

Abstract

In this study, we report the emissive properties of a heteroleptic cyclometalated Ir(III) complex, [Ir(bzq)2(PBO)] (bzqH = benzo[h]quinoline; PBOH = 2-(2-hydroxyphenyl)benzoxazole). The complex, [Ir(C^N)2(N^O)], was synthesised and optically resolved using a chiral column. Two geometrical isomers, trans-(N,N) and cis-(N,N) isomers, were obtained as the major and minor products in an enantiopure form, respectively. Their molecular structures were determined using single crystal X-ray analysis. In the crystalline states, the intermolecular C–H⋯π interaction between PBO and an H atom in bzq was the main factor influencing molecular packing. When the complexes were dissolved in CH2Cl2 and excited at 430 nm under N2 atmosphere, yellow (λmax = 550 nm) and orange emissions (λmax = 570 nm) were observed for the trans-(N,N) and cis-(N,N) isomers, respectively, with the quantum yield higher for the former than the latter.

Graphical abstract: Effects of geometrical isomerism on emissive behaviour of heteroleptic cyclometalated Ir(iii) complexes

Supplementary files

Article information

Article type
Paper
Submitted
08 Mar 2021
Accepted
25 May 2021
First published
26 May 2021

Dalton Trans., 2021,50, 8506-8511

Author version available

Effects of geometrical isomerism on emissive behaviour of heteroleptic cyclometalated Ir(III) complexes

Y. Jinsenji, K. Takimoto, J. Yoshida, S. Mori, Y. Watanabe and H. Sato, Dalton Trans., 2021, 50, 8506 DOI: 10.1039/D1DT00783A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements