Work

Molecular Rectangles Featuring Two Parallel NCN ‐Coordinated Platinum Units: Enhancing Near‐Infrared Emission Through Excimer Formation

Year: 2025

Type: article

Abstract: New macrocycli c molecules are described that incorporate Pt( NCN ) units on opposite edges of a rectangular structure, with xanthene units constituting the other two sides. Here, NCN represents a cyclometallating tridentate ligand based on 2,6‐di(2‐pyridyl)benzene or its pyrimidine analog. The complexes display strong photoluminescence peaking in the near‐infrared region of the spectrum in solution ( λ max up to 761 nm). Photophysical data and DFT calculations indicate that the emission arises from “intramolecular excimers”—triplet excited states that form when the two Pt( NCN ) units within the molecule are brought into close proximity to interact interfacially. In doped polymers, the necessary molecular distortion is inhibited, but related excited states that emit in a similar region can still form through intermolecular interactions.

Source: Chemistry - A European Journal

DOI: 10.1002/chem.202500834

Authors: Rebecca J. Salthouse, Amit Sil, Piotr Pander, Fernando B. Dias, J. A. Gareth Williams

Institutions: Durham University, Silesian University of Technology

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,640

Funders: Narodowe Centrum Nauki, Engineering and Physical Sciences Research Council