Quinoxaline sensitised lanthanide ion luminescence: Syntheses, spectroscopy and X-ray crystal structure of Na1,4,7-tris[(N-diethyl)carbamoylmethyl]-1,4,7,10-tetraazacyclododecane -10-(2-methylquinoxaline)I3C7H8

M. Andrews, R.H. Laye, L.P. Harding, S.J.A. Pope

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Abstract

The synthesis of a quinoxaline-appended aza-macrocyclic ligand together with corresponding LnIII complexes are described. The luminescence properties of the complexes show that the quinoxaline unit sensitises both visible (EuIII) and near-IR (NdIII and YbIII) emitting lanthanide ions. UV–Vis absorption and time-resolved photophysical studies together with X-ray structural data suggest that as well as contributing chromophorically, the quinoxaline moiety generally participates in the first coordination sphere of LnIII. The luminescent pH response of the EuIII complex is also reported. The form of the steady state spectrum changes profoundly in the pH range 2–12, implying a change in the coordination environment, which was confirmed with time-resolved lifetime measurements that suggest an increase in europium inner sphere hydration at acidic pH.
LanguageEnglish
Pages2365-2371
Number of pages7
JournalPolyhedron
Volume27
Issue number11
DOIs
Publication statusPublished - Aug 2008

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quinoxalines
Quinoxalines
Lanthanoid Series Elements
Rare earth elements
Luminescence
Crystal structure
Spectroscopy
Ions
luminescence
X rays
crystal structure
Europium
synthesis
Hydration
spectroscopy
ions
x rays
Ligands
europium
hydration

Cite this

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title = "Quinoxaline sensitised lanthanide ion luminescence: Syntheses, spectroscopy and X-ray crystal structure of Na1,4,7-tris[(N-diethyl)carbamoylmethyl]-1,4,7,10-tetraazacyclododecane -10-(2-methylquinoxaline)I3C7H8",
abstract = "The synthesis of a quinoxaline-appended aza-macrocyclic ligand together with corresponding LnIII complexes are described. The luminescence properties of the complexes show that the quinoxaline unit sensitises both visible (EuIII) and near-IR (NdIII and YbIII) emitting lanthanide ions. UV–Vis absorption and time-resolved photophysical studies together with X-ray structural data suggest that as well as contributing chromophorically, the quinoxaline moiety generally participates in the first coordination sphere of LnIII. The luminescent pH response of the EuIII complex is also reported. The form of the steady state spectrum changes profoundly in the pH range 2–12, implying a change in the coordination environment, which was confirmed with time-resolved lifetime measurements that suggest an increase in europium inner sphere hydration at acidic pH.",
author = "M. Andrews and R.H. Laye and L.P. Harding and S.J.A. Pope",
note = "cited By 16",
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T1 - Quinoxaline sensitised lanthanide ion luminescence

T2 - Polyhedron

AU - Andrews, M.

AU - Laye, R.H.

AU - Harding, L.P.

AU - Pope, S.J.A.

N1 - cited By 16

PY - 2008/8

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N2 - The synthesis of a quinoxaline-appended aza-macrocyclic ligand together with corresponding LnIII complexes are described. The luminescence properties of the complexes show that the quinoxaline unit sensitises both visible (EuIII) and near-IR (NdIII and YbIII) emitting lanthanide ions. UV–Vis absorption and time-resolved photophysical studies together with X-ray structural data suggest that as well as contributing chromophorically, the quinoxaline moiety generally participates in the first coordination sphere of LnIII. The luminescent pH response of the EuIII complex is also reported. The form of the steady state spectrum changes profoundly in the pH range 2–12, implying a change in the coordination environment, which was confirmed with time-resolved lifetime measurements that suggest an increase in europium inner sphere hydration at acidic pH.

AB - The synthesis of a quinoxaline-appended aza-macrocyclic ligand together with corresponding LnIII complexes are described. The luminescence properties of the complexes show that the quinoxaline unit sensitises both visible (EuIII) and near-IR (NdIII and YbIII) emitting lanthanide ions. UV–Vis absorption and time-resolved photophysical studies together with X-ray structural data suggest that as well as contributing chromophorically, the quinoxaline moiety generally participates in the first coordination sphere of LnIII. The luminescent pH response of the EuIII complex is also reported. The form of the steady state spectrum changes profoundly in the pH range 2–12, implying a change in the coordination environment, which was confirmed with time-resolved lifetime measurements that suggest an increase in europium inner sphere hydration at acidic pH.

U2 - 10.1016/j.poly.2008.04.010

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