Abstract
The ML4 complexes formed by reaction between the bidentate azulene-based ligand diethyl 2-hydroxyazulene-1,3-dicarboxylate (HAz) and several lanthanide cations (Pr3+, Nd3+, Gd3+, Ho3+, Er3+, Tm3+, Yb3+, and Lu 3+) have been synthesized and characterized by elemental analysis, FT-IR vibrational spectroscopy and electrospray ionization mass spectroscopy, Spectrophotometric titrations have revealed that four Az ligands react with one lanthanide cation to form the ML4 complex in solution. Studies of the luminescence properties of these ML4 complexes demonstrated that Az is an efficient sensitizer for four different near-infrared emitting lanthanide cations (Nd3+, Er3+, Tm3+, and Yb 3+); the resulting complexes have high quantum yield values in CH3CN. The near-infrared emission arising from Tm3+ is especially interesting for biologic imaging and bioanalytical applications since biological systems have minimal interaction with photons at this wavelength. Hydration numbers, representing the number of water molecules bound to the lanthanide cations, were obtained through luminescence lifetime measurements and indicated that no molecules of water/solvent are bound to the lanthanide cation in the ML4 complex in solution. The four coordinated ligands protect well the central luminescent lanthanide cation against non-radiative deactivation from solvent molecules.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1264-1272 |
| Number of pages | 9 |
| Journal | Chemistry - A European Journal |
| Volume | 14 |
| Issue number | 4 |
| DOIs | |
| State | Published - Feb 11 2008 |
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Keywords
- Azulenes
- Lanthanides
- Luminescence
- Near-infrared spectroscopy
- Sensitizers
ASJC Scopus subject areas
- Catalysis
- Organic Chemistry
Cite this
Azulene-moiety-based ligand for the efficient sensitization of four near-infrared luminescent lanthanide cations : Nd3+, Er3+, Tm3+, and Yb3+. / Zhang, Jian; Petoud, Stéphane.
In: Chemistry - A European Journal, Vol. 14, No. 4, 11.02.2008, p. 1264-1272.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Azulene-moiety-based ligand for the efficient sensitization of four near-infrared luminescent lanthanide cations
T2 - Nd3+, Er3+, Tm3+, and Yb3+
AU - Zhang, Jian
AU - Petoud, Stéphane
PY - 2008/2/11
Y1 - 2008/2/11
N2 - The ML4 complexes formed by reaction between the bidentate azulene-based ligand diethyl 2-hydroxyazulene-1,3-dicarboxylate (HAz) and several lanthanide cations (Pr3+, Nd3+, Gd3+, Ho3+, Er3+, Tm3+, Yb3+, and Lu 3+) have been synthesized and characterized by elemental analysis, FT-IR vibrational spectroscopy and electrospray ionization mass spectroscopy, Spectrophotometric titrations have revealed that four Az ligands react with one lanthanide cation to form the ML4 complex in solution. Studies of the luminescence properties of these ML4 complexes demonstrated that Az is an efficient sensitizer for four different near-infrared emitting lanthanide cations (Nd3+, Er3+, Tm3+, and Yb 3+); the resulting complexes have high quantum yield values in CH3CN. The near-infrared emission arising from Tm3+ is especially interesting for biologic imaging and bioanalytical applications since biological systems have minimal interaction with photons at this wavelength. Hydration numbers, representing the number of water molecules bound to the lanthanide cations, were obtained through luminescence lifetime measurements and indicated that no molecules of water/solvent are bound to the lanthanide cation in the ML4 complex in solution. The four coordinated ligands protect well the central luminescent lanthanide cation against non-radiative deactivation from solvent molecules.
AB - The ML4 complexes formed by reaction between the bidentate azulene-based ligand diethyl 2-hydroxyazulene-1,3-dicarboxylate (HAz) and several lanthanide cations (Pr3+, Nd3+, Gd3+, Ho3+, Er3+, Tm3+, Yb3+, and Lu 3+) have been synthesized and characterized by elemental analysis, FT-IR vibrational spectroscopy and electrospray ionization mass spectroscopy, Spectrophotometric titrations have revealed that four Az ligands react with one lanthanide cation to form the ML4 complex in solution. Studies of the luminescence properties of these ML4 complexes demonstrated that Az is an efficient sensitizer for four different near-infrared emitting lanthanide cations (Nd3+, Er3+, Tm3+, and Yb 3+); the resulting complexes have high quantum yield values in CH3CN. The near-infrared emission arising from Tm3+ is especially interesting for biologic imaging and bioanalytical applications since biological systems have minimal interaction with photons at this wavelength. Hydration numbers, representing the number of water molecules bound to the lanthanide cations, were obtained through luminescence lifetime measurements and indicated that no molecules of water/solvent are bound to the lanthanide cation in the ML4 complex in solution. The four coordinated ligands protect well the central luminescent lanthanide cation against non-radiative deactivation from solvent molecules.
KW - Azulenes
KW - Lanthanides
KW - Luminescence
KW - Near-infrared spectroscopy
KW - Sensitizers
UR - http://www.scopus.com/inward/record.url?scp=38849184729&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38849184729&partnerID=8YFLogxK
U2 - 10.1002/chem.200701068
DO - 10.1002/chem.200701068
M3 - Article
C2 - 18046681
AN - SCOPUS:38849184729
VL - 14
SP - 1264
EP - 1272
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 4
ER -