Visible and Near-Infrared Emission from Lanthanoid
β‑Triketonate
Assemblies Incorporating Cesium Cations
Version 2 2017-08-17, 21:20
Version 1 2017-07-11, 11:49
Posted on 2017-08-17 - 21:20
The reaction of the β-triketonate
ligands tris(4-methylbenzoyl)methanide and tribenzoylmethanide with
the trivalent lanthanoids Eu3+, Er3+, and Yb3+ in the presence of Cs+ afforded polymeric structures
where the repeating units are represented by bimetallic tetranuclear
assemblies of formulation {[Ln(Cs)(β-triketonate)4]2}n. The only exception is
the structure formed by the reaction of tris(4-methylbenzoyl)methanide,
Yb3+, and Cs+, which yielded a polymeric assembly
where the repeating units are mononuclear Yb3+ complexes
bridged by Cs+ cations. Photophysical measurements on the
obtained materials confirmed efficient sensitization from the ligand
excited states to the 4f* excited states of the three lanthanoids.
According to transient absorption data, Er3+ and Yb3+ are sensitized via energy transfer from the triplet state
of the β-triketonate ligands. On the other hand, energy transfer
to Eu3+ seems to occur via an alternative pathway, possibly
directly via the singlet state or through ligand to metal charge transfer
states. The emission measurements confirm efficient sensitization
for all three lanthanoids and bright near-infrared emission for Er3+ and Yb3+, a characteristic that seems to be linked
to the specific chemical structure of the β-triketonate ligands.
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Galán, Laura
Abad; Reid, Brodie L.; Stagni, Stefano; Sobolev, Alexandre N.; Skelton, Brian W.; Cocchi, Massimo; et al. (2017). Visible and Near-Infrared Emission from Lanthanoid
β‑Triketonate
Assemblies Incorporating Cesium Cations. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b00928
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AUTHORS (11)
LG
Laura
Abad Galán
BR
Brodie L. Reid
SS
Stefano Stagni
AS
Alexandre N. Sobolev
BS
Brian W. Skelton
MC
Massimo Cocchi
JM
Joanna M. Malicka
EZ
Eli Zysman-Colman
EM
Evan G. Moore
MO
Mark I. Ogden
MM
Massimiliano Massi