An Organic-Inorganic Hybrid Luminescent Hybrid Manganese Chloride Constructed by Hydroxyl-Functionalized Ionic Liquid

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Abstract
Organic-inorganic hybrid metal halides (OIHMHs), whose structures and optical properties can be tuned, have attracted increasing attention. Herein, we report a hybrid manganese chloride prepared by ionothermal synthesis using the hydroxyl-functionalized ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium chloride ([HOEtMIm]Cl) as both solvent and reactant. Unlike conventional ionic liquids that function primarily as solvents or structure-directing agents, [HOEtMIm]Cl acts as organic ligand and halogen source to coordinate with Mn2+, generating a one-dimensional hybrid manganese chloride chain of MnCl3(HOEtMIm). MnCl3(HOEtMIm) displays high thermal stability and red emission associated with the spin-forbidden 4T1 → 6A1 transition of Mn2+. These results show that functionalized ionic liquids can act as programmable coordination modules in hybrid metal halides, providing a strategy to tune metal coordination environments and luminescent properties.

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