Functionalized triphenylphosphine oxide-based manganese(ii) complexes for luminescent printing?

Dalton Transactions Pub Date: 2021-05-18 DOI: 10.1039/D1DT00914A

Abstract

Three novel neutral manganese(II) complexes (TPhPONMe2)2MnBr2, (TPhPOOMe)2MnBr2, and (TPhPOCF3)2MnBr2 have been designed and synthesized based on a functionalized Ph3PO ligand. These structures are clarified by single crystal X-ray diffraction analysis, which reveals that they crystallize in centrosymmetric space groups and feature an isolated mononuclear structure with Mn2+ in a tetrahedral environment. The photoluminescence spectra and emission lifetime decay curves of three manganese(II) complexes show distinct green emission (λem = 498–512 nm) and phosphorescence lifetime (τ = 362.0–663.0 μs). The results of DFT calculations indicate that the energy levels of (TPhPONMe2)2MnBr2 and (TPhPOOMe)2MnBr2 are higher than that of (TPhPOCF3)2MnBr2 due to the electron-donating effect of the NMe2 or OMe group, which explains the blue-shift of the emission wavelength and the increase of emission lifetime. Furthermore, the prepared neutral manganese(II) complexes can be used for high-resolution luminescent printing.

Graphical abstract: Functionalized triphenylphosphine oxide-based manganese(ii) complexes for luminescent printing
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