A Near‐Infrared‐II Emissive Chromium(III) Complex

The combination of π-donating amido with π-accepting pyridine coordination units in a tridentate chelate ligand causes a strong nephelauxetic effect in a homoleptic CrIII complex, which shifts its luminescence to the NIR-II spectral range. Previously explored CrIII polypyridine complexes typically emit between 727 and 778 nm (in the red to NIR-I spectral region), and ligand design strategies have so far concentrated on optimizing the ligand field strength. The present work takes a fundamentally different approach and focusses on increasing metal–ligand bond covalence to shift the ruby-like 2E emission of CrIII to 1067 nm at 77 K.

Keywords

UV/Vis spectroscopy
Chelates
Chromium
Luminescence
Photophysics

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

UNIGE research groups

Groupe Piguet

Funding

Swiss National Science Foundation - Can Functional Metallopolymers and Supramolecular Assemblies Benefit from Molecular Organization Mastered by Coordination Chemists ? [200020_178758]

Citation (ISO format)

SINHA, Narayan et al. A Near‐Infrared‐II Emissive Chromium(III) Complex. In: Angewandte Chemie (International Edition), 2021, vol. 60, n° 44, p. 23722–23728. doi: 10.1002/anie.202106398

Article (Accepted version)

Identifiers

PID : unige:156643
DOI : 10.1002/anie.202106398
PMID : 34125469

Additional URL for this publication

https://onlinelibrary.wiley.com/doi/10.1002/anie.202106398

Journal ISSN

1433-7851

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1084downloads

Creation

23/11/2021 11:04:00

First validation

23/11/2021 11:04:00

Update

13/10/2025 15:52:31

Status update

16/03/2023 01:54:14

Last indexation

01/09/2026 05:44:51

A Near‐Infrared‐II Emissive Chromium(III) Complex

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Abstract