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- W2106369160 abstract "Abstract The ML 4 complexes formed by reaction between the bidentate azulene‐based ligand diethyl 2‐hydroxyazulene‐1,3‐dicarboxylate (HAz) and several lanthanide cations (Pr 3+ , Nd 3+ , Gd 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , 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 ML 4 complex in solution. Studies of the luminescence properties of these ML 4 complexes demonstrated that Az − is an efficient sensitizer for four different near‐infrared emitting lanthanide cations (Nd 3+ , Er 3+ , Tm 3+ , and Yb 3+ ); the resulting complexes have high quantum yield values in CH 3 CN. The near‐infrared emission arising from Tm 3+ 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 ML 4 complex in solution. The four coordinated ligands protect well the central luminescent lanthanide cation against non‐radiative deactivation from solvent molecules." @default.
- W2106369160 created "2016-06-24" @default.
- W2106369160 creator A5028509118 @default.
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- W2106369160 date "2008-01-18" @default.
- W2106369160 modified "2023-10-18" @default.
- W2106369160 title "Azulene-Moiety-Based Ligand for the Efficient Sensitization of Four Near-Infrared Luminescent Lanthanide Cations: Nd3+, Er3+, Tm3+, and Yb3+" @default.
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- W2106369160 doi "https://doi.org/10.1002/chem.200701068" @default.
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