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- W2025497304 abstract "Abstract The complexation of terpyridine ( tpy ) and its 4′‐ethynyl (E) and 4′‐(2‐thienyl) (T) derivatives, as promising chelate end groups for oligomeric components of conjugated metallosupramolecular polymers, with Zn 2+ and Fe 2+ ions as ion couplers was investigated in acetonitrile using NMR and UV/Vis spectroscopy. The binding of these ligands with Zn 2+ ions shows two distinct steps with comparable binding constants in the range of 10 6 dm 3 mol –1 , whereas their binding with Fe 2+ ions shows a strong tendency to form [FeL 2 ] 2+ species, which almost do not dissociate to monoligand species [FeL] 2+ even at a twofold excess of Fe 2+ ions. The ligand exchange dynamics between [ZnL 2 ] 2+ species in solution was studied by NMR spectroscopy and the related parameters were determined. UV/Vis spectra taken during complexation show an apparent isosbestic point at 310 ± 10 nm, and those of the systems with Fe 2+ ions also show a metal‐to‐ligand charge‐transfer band at 550–580 nm. 4′‐Substituents strongly enhance the luminescence of tpy (ca. 400 times). Additional enhancement is provided by binding the ligands to Zn 2+ ions, whereas their binding to Fe 2+ ions quenches the fluorescence." @default.
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- W2025497304 date "2012-07-11" @default.
- W2025497304 modified "2023-10-10" @default.
- W2025497304 title "Effect of Ethynyl and 2‐Thienyl Substituents on the Complexation of 4′‐Substituted 2,2′:6′,2″‐Terpyridines with Zn <sup>2+</sup> and Fe <sup>2+</sup> Ions, and the Spectroscopic Properties of the Ligands and Formed Complex Species" @default.
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- W2025497304 doi "https://doi.org/10.1002/ejic.201200256" @default.
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