In:
European Journal of Inorganic Chemistry, Wiley
Abstract:
Ten ionic manganese(II) complexes of [EMIm]2[MnX2Y2] (EMIm = 1‑ethyl‐3‐methylimidazolium ion; X, Y = Cl, Br or I) and [BnMIm]2[MnX2Y2] (BnMIm = 1‐benzyl‐3‐methylimidazolium ion; X, Y = Cl, Br or I) types were synthesized and studied in terms of their thermal and photophysical properties. Complexes with [BnMIm]+ cation were found to exhibit higher crystallinity, owing to the aromatic π‐stacking, and superior photoluminescent quantum yields, promoted by the increased Mn⋯Mn distance. For complexes with chlorine and bromine ligands efficient tunability of photophysical parameters was demonstrated. Out of all complexes, [BnMIm] 2[MnBr4] was found to have the highest photoluminescence quantum yield at room temperature (Φ = 0.59). To highlight the importance of a large Mn⋯Mn distance for achieving high Φ values, a mixed‐anion analog of complex [BnMIm] 2[MnBr4] was prepared, with the suggested formula of [BnMIm] 4[MnBr4]Br2. The latter have shown a significant improvement in d–d absorption efficiency and a reduction in nonradiative deactivation, which led to an outstanding Φ value of 0.97. Finally, the optical band gap of [BnMIm] 4[MnBr4]Br2 was estimated to describe its applicability as light‐emitting material.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.202300562
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
1475009-0
