Influence of symmetry on the luminescence and radiative lifetime of nine-coordinate europium complexes

Inorganic Chemistry
Nail M ShavaleevJean-Claude G Bünzli

Abstract

Homoleptic mononuclear nine-coordinate lanthanum(III) and europium(III) tris-complexes [Ln(N(∧)N(∧)O)3]·nH2O with two tridentate N-benzylbenzimidazole pyridine-2-carboxylates exhibit a rare C3-symmetry of the lanthanide coordination polyhedron in the solid state, as confirmed by luminescence spectroscopy and by X-ray crystallography (the three N(∧)N(∧)O ligands are arranged "up-up-up" around the lanthanide ion). The symmetry, however, is changed to the more common C1 upon dissolution of the complexes in dichloromethane, as revealed by luminescence spectroscopy (the three ligands are likely to be arranged "up-up-down"). The new europium complexes emit efficient ligand-sensitized metal-centered luminescence with excited-state lifetimes of 1.56-2.18 ms and quantum yields of 25-41% in the solid and in solution. The change of the symmetry from (a higher) C3 to (a lower) C1 alters the luminescence spectrum, shortens the radiative lifetime, and increases the luminescence efficiency of the europium complexes.

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Citations

Oct 30, 2015·Physical Chemistry Chemical Physics : PCCP·Bing LiPengfei Yan
Nov 15, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·T M GeorgeM L P Reddy
Aug 11, 2018·Chemistry : a European Journal·Sven H ZottnickKlaus Müller-Buschbaum
Feb 28, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Laura Abad GalánMassimiliano Massi
Jul 16, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Markus F K TrautnitzMichael Seitz
Jan 30, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Despoina AndriotouTheodore Lazarides
Mar 3, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuichi KitagawaYasuchika Hasegawa
Oct 1, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·A ArauzoE Bartolomé

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