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Inorganics 2018, 6(2), 56; https://doi.org/10.3390/inorganics6020056

Homoleptic Lanthanide Complexes Containing a Redox-Active Ligand and the Investigation of Their Electronic and Photophysical Properties

1
Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
2
Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada
3
Department of Chemistry, Université de Montreal, Montreal, QC H3C 3J7, Canada
4
Department of Chemistry, University of Winnipeg, Winnipeg, MB R3B 2G3, Canada
5
Canadian Institute for Advanced Research, Quantum Materials, MaRS Centre, West Tower, 661 University Ave., Suite 505, Toronto, ON M5G 1M1, Canada
6
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
7
Department of Chemistry, Brandon University, Brandon, MB R7A 6A9, Canada
*
Author to whom correspondence should be addressed.
Received: 19 March 2018 / Revised: 17 May 2018 / Accepted: 18 May 2018 / Published: 25 May 2018
(This article belongs to the Special Issue Redox-Active Ligand in Coordination Chemistry)
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Abstract

Herein, we describe the preparation, characterization and photophysical properties of neutral lanthanide complexes containing a redox-active ligand 1-(2-pyridylazo)-2-phenanthrol (papl). The complexes likely share similar structural features and bear the formulation Ln(papl)3 (Ln(III) = Gd, Dy, Tb), which is supported by electrospray ionization mass spectrometry, CHN analysis, FT-IR and UV–Vis spectroscopy. The synthesis and structural properties of a related complex, Ho(qapl)3 (where qapl = 10-(8-quinolylazo)-9-phenanthrol), is also reported. The complexes feature ligand-centered redox activity, similar to other reported transition metal complexes with papl. Variable temperature magnetic susceptibility measurements (DC and AC) suggest typical free-ion magnetism without any slow-relaxation dynamics. The photophysical properties of the ligand and complexes were investigated and the results of emission spectroscopy indicate ligand-centered processes. View Full-Text
Keywords: redox active ligands; arylazo ligands; lanthanide ions; photophysical properties redox active ligands; arylazo ligands; lanthanide ions; photophysical properties
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Taylor, R.A.; Bonanno, N.M.; Cibian, M.; Yadav, J.; Silverstein, H.J.; Wiebe, C.R.; Mauws, C.; Lough, A.J.; Lemaire, M.T. Homoleptic Lanthanide Complexes Containing a Redox-Active Ligand and the Investigation of Their Electronic and Photophysical Properties. Inorganics 2018, 6, 56.

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