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A Near-Infrared-II Emissive Chromium(III) Complex.

ABSTRACT: 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 Cr^III complex, which shifts its luminescence to the NIR-II spectral range. Previously explored Cr^III 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 ² E emission of Cr^III to 1067 nm at 77 K.

SUBMITTER: Sinha N

PROVIDER: S-EPMC8597102 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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A Near-Infrared-II Emissive Chromium(III) Complex.

Sinha Narayan N Jiménez Juan-Ramón JR Pfund Björn B Prescimone Alessandro A Piguet Claude C Wenger Oliver S OS

Angewandte Chemie (International ed. in English) 20210712 44

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 Cr<sup>III</sup> complex, which shifts its luminescence to the NIR-II spectral range. Previously explored Cr<sup>III</sup> 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 ...[more]

PMID: 34125469

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