Issue 8, 2023

Aqua-friendly organometallic Ir–Pt complexes: pH-responsive AIPE-guided imaging of bacterial cells

Abstract

In this work, the aggregation-induced photoluminescence emission (AIPE) of three water-soluble heterobimetallic Ir–Pt complexes was reported with insight into their photophysical and electrochemical properties and imaging of bacterial cells. An alkyne appended Schiff's base L, bridges bis-cyclometalated iridium(III) and platinum(II) terpyridine centre. The Schiff's base (N–N fragment) serves as the ancillary ligand to the iridium(III) centre, while the alkynyl end is coordinated to platinum(II). The pH and ionic strength influence the aggregation kinetics of the alkynylplatinum(II) fragment, leading to metal–metal and π–π interactions with the emergence of a triplet metal–metal-to-ligand charge transfer (3MMLCT) emission. The excellent reversibility and photostability of aggregation-induced emission (AIE) of these aqua-friendly complexes were tested for their ability to sense and selectively image E. coli cells at various pH values.

Graphical abstract: Aqua-friendly organometallic Ir–Pt complexes: pH-responsive AIPE-guided imaging of bacterial cells

Supplementary files

Article information

Article type
Paper
Submitted
19 okt 2022
Accepted
14 jan 2023
First published
16 jan 2023

Dalton Trans., 2023,52, 2282-2292

Aqua-friendly organometallic Ir–Pt complexes: pH-responsive AIPE-guided imaging of bacterial cells

S. T. Borah, B. Das, P. Biswas, A. I. Mallick and P. Gupta, Dalton Trans., 2023, 52, 2282 DOI: 10.1039/D2DT03390A

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