Trinuclear Organometallic Pt−Ir−Pt Complexes: Insights into Photophysical Properties, Amino Acid Binding and Protein Sensing

Abstract

The rational synthesis of trinuclear emissive organometallic complexes with two equivalent platinum(II) centres appended to the ancillary substituted 2,2′‐bipyridyl ligand of the cyclometalated iridium(III) centre is reported here. The alkynyl‐platinum moiety and cyclometalated iridium(III) centres have been separated through a non‐conjugated CH2−O−CH2 linkage. The emission titration with amino acids reveals that the complexes sense free amino acids. The luminescence sensing of BSA is thus attributed to the amino acid sensing ability of the complexes and confirmed by emission anisotropy and Far‐UV CD spectral study. The decrease in α‐helix in the CD spectra signifies the changes in the secondary structure of protein in presence of the complexes.

Systematic Conversion of Photoinduced Intramolecular Electron Transfer in Trinuclear M-Ir-M (M = Re, Ir) Complexes to Intersystem Charge Transfer by Coupling to Gold Nanoclusters

“…Earlier efforts to engineer the HOMO–LUMO gap were in the line of ligand modification and through systematic inclusion of emissive or non-emissive metal centers at the cyclometalated or ancillary ligand ends. − We have shown that proper choice of the second metal center helps in designing multinuclear metal complexes, where the cyclometalated Ir­(III) core remains as the emissive center and the other metal center(s) provide binding sites for amino acids and nucleic acids. Our recent interest in the synthesis of multimetallic complexes recommended methods to manipulate the emission and redox properties based on electron transfer among the metal centers. − …”

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

“…The detailed synthetic procedure is outlined in Scheme 1. 15 The complexes are characterized by CHN analysis, ESI-MS (Fig. S1†) and 1 H NMR, 13 C NMR, 195 Pt NMR (Fig.…”

Efficient Energy Conversion using Tri-nuclear M-Ru(II)-M[M= Pt(II), Re(I)] Catalysts

“…The ligand L was synthesized through a multistep procedure as detailed in our prior research article. [42][43] Subsequently, L reacts with Ru(bpy)₂Cl₂ in a solvent mixture of ethanol:water (3:1) at 80°C for 4h under inert conditions, resulting in the formation of complex Ru1 as a photosensitizing center. Ru1 undergo a Cu(I)-catalyzed cycloaddition reaction using Cu(CH₃CN)₄PF₆, Cu(0), and DIPEA in a DCM:Methanol (4:1) solvent at 60°C for 5 days, to afford complex Ru2.…”