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Issue 5, 2018
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Temperature- and excitation wavelength-dependent emission in a manganese(II) complex

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Abstract

A mononuclear manganese(II) complex with a chelating 4-(3,5-diphenyl-1H-pyrazol-1-yl)-6-(piperidin-1-yl)pyrimidine ligand (L), [MnL2Cl2]·H2O, shows intriguing excitation wavelength-dependent emission. Depending on the excitation wavelength, the complex demonstrates three emission bands with the maxima at 380 nm, 440 nm and 495 nm. The 380 nm and 440 nm emissions originate from the π → π* and n → π* ligand-centered transitions. The long-wave 495 nm emission with microsecond lifetimes is related to the d–d transitions and/or metal-to-ligand and halogen-to-ligand charge transfer. The emission behavior of this complex is strongly temperature-dependent: upon cooling from 300 K down to 77 K, the intensity of emission considerably increases. The enhancement of the luminescence upon cooling is accompanied by the appearance of the vibrational structure. This complex is the first example of manganese(II) complexes demonstrating excitation wavelength-dependent emission.

Graphical abstract: Temperature- and excitation wavelength-dependent emission in a manganese(ii) complex

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Publication details

The article was received on 01 Dec 2017, accepted on 19 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04535B
Citation: Dalton Trans., 2018,47, 1657-1665
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    Temperature- and excitation wavelength-dependent emission in a manganese(II) complex

    A. S. Berezin, K. A. Vinogradova, V. A. Nadolinny, T. S. Sukhikh, V. P. Krivopalov, E. B. Nikolaenkova and M. B. Bushuev, Dalton Trans., 2018, 47, 1657
    DOI: 10.1039/C7DT04535B

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