Synergistic Paramagnetic, Piezoelectric, and Chiral Optical Effects in Fe- and Mn- Hybrid Metal Halides.

Authors

Priya Ranjan, Shubhankar Barman, Chinmayee Mandar Mhaskar, Ayan Roy Chaudhuri, Vishal Dev Ashok, Anuja Datta

Published in

Inorganic chemistry. Jul 17, 2026. Epub Jul 17, 2026.

Abstract

The integration of chirality with multiple coupled physical functionalities in a single material system is emerging as a powerful strategy for advancing next-generation photonic and electronic technologies. Intrinsically chiral hybrid metal halides, which combine molecular-level asymmetry with tunable inorganic frameworks, provide a unique platform for realizing strong chiroptical activity alongside emerging physical properties. In this context, we show that the incorporation of Fe- and Mn- centers within tetrahedral hybrid organic-inorganic metal-halide units enable the coexistence of chirality with magnetic functionality. A systematic study of two noncentrosymmetric, magnetically active hybrid metal halides, [MePPh₃]FeCl₄ (PFC) and [MePPh₃]₂MnOCl₄ (PMC) show complex multifunctional behavior, where both materials display pronounced ground-state circular dichroism (CD), with dissymmetry factors g_CD ≈ - 2.9 × 10^-3 (PFC) and 3.1 × 10^-4 (PMC), together with sizable luminescence dissymmetry factors g_lum ≈ - 4.6 × 10^-2 and 1.6 × 10^-4, respectively, indicating efficient chirality induction by the molecular cation to the inorganic framework. Under varying external magnetic fields, weak yet distinct magnetic circular dichroism (MCD) signals are observed at room temperature, resulting in enhancements of g_CD by ∼ 0.58 for PFC and ∼ 0.68 for PMC, accompanied by positive spectral shifts of ∼ 2 nm and ∼ 4 nm. Simultaneously, both crystals exhibit significant piezoelectric responses, yielding impressive output voltage of V_oc ≈ 1.39 V and V_oc ≈ 1.95 V, upon external mechanical vibration, from the piezoelectric generator devices from PFC and PMC, respectively.

PMID:
42467469
Bibliographic data and abstract were imported from PubMed on 17 Jul 2026.

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