Self-Calibrated Luminescence Sensing Under Pressure in a Hybrid Manganese Halide.

Authors

Lian-Cai An, Bao-Yi Jian, Xue Lv, Fei-Fei Gao, Wei Li, Guo-Ming Wang

Published in

Angewandte Chemie (International ed. in English). Pages e2354490. Oct 12, 2026. Epub Oct 12, 2026.

Abstract

Hybrid organic-inorganic manganese halides have emerged as a promising class of emitters, owing to their excellent optical properties, low toxicity, and rich structural diversity. However, achieving site-specific control over their high-pressure optical response remains a great challenge. In this study, we report a zero-dimensional manganese chloride, (HIm)₆[MnCl₄∙MnCl₆] (HIm = imidazolium), which concurrently incorporates both tetrahedral and octahedral Mn^{2 +} centers within a single lattice. Under pressure, the red emission of [MnCl₆]^4- exhibits a pronounced and linear redshift and intensity attenuation. However, the green emission of [MnCl₄]^2- remains stable in both peak position and intensity, serving as a rigid energetic anchor. By leveraging the invariant green emission as an internal reference and the pressure-sensitive red emission as a probe, a self-calibrated pressure sensing system is achieved. Synchrotron high-pressure x-ray diffraction, in situ optical spectroscopy and density functional theory calculations demonstrate that this decoupled response originates from the large structural compressibility of the [MnCl₆]^4- octahedra and high rigidity of the [MnCl₄]^2- tetrahedra. Our findings demonstrate that hybrid organic-inorganic crystals represent a promising class of self-calibrated optical sensing materials for next-generation metrology.

PMID:
42865072
Bibliographic data and abstract were imported from PubMed on 13 Oct 2026.

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