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Analysis of Anion B...
Analysis of Anion Binding Effects on the Sensitized Luminescence of Macrocyclic Europium(III) Complexes
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- Kiraev, Salauat R. (författare)
- Uppsala universitet,Syntetisk molekylär kemi
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- Weber, Roza R. (författare)
- Uppsala universitet,Institutionen för kemi - Ångström
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- Wells, Jordann A. L. (författare)
- Uppsala universitet,Syntetisk molekylär kemi
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- Orthaber, Andreas, 1979- (författare)
- Uppsala universitet,Syntetisk molekylär kemi
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- Kovacs, Daniel (författare)
- Uppsala universitet,Molekylär biomimetik
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- Borbas, K. Eszter (författare)
- Uppsala universitet,Syntetisk molekylär kemi
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(creator_code:org_t)
- 2022-06-17
- 2022
- Engelska.
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Ingår i: Analysis & Sensing. - : Wiley-VCH Verlagsgesellschaft. - 2629-2742. ; 2:6
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Four triazamacrocyclic and two tetraazamacrocyclic ligands carrying two and three coordinating donor groups, respectively, and a carbostyril light-harvesting antenna were synthesized. The antenna was linked to a macrocycle either via secondary or tertiary amide. Complexation with europium (Eu), gadolinium (Gd), terbium (Tb), and ytterbium (Yb) yielded overall +1 or +2 charged species. Paramagnetic 1H NMR, and steady-state and time-resolved luminescence spectroscopies showed that the complexes had 1–3 inner-sphere water molecules and displayed a variety of coordination geometries in solution. The antennae sensitized Eu(III) and Tb(III) emission with quantum yields of 0.3–4.3 % and 9.9–24.5 %, respectively. The addition of excess fluoride or cyanide to buffered Eu(III) complex solutions resulted in anion-dependent changes. Fluoride addition increased the Eu(III) luminescence intensity by displacing all inner-sphere water molecules and stabilizing the +3 oxidation state of Eu. Eu(III) luminescence increased up to 25-fold for one emitter. Cyanide quenched Eu(III) luminescence in all cases despite partial water ligand displacement.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
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