Details

Autor(en) / Beteiligte

• Li, Xin
• Fast, Alexander
• Huang, Zhiyuan
• Fishman, Dmitry A.
• Tang, Ming Lee

Titel

Complementary Lock‐and‐Key Ligand Binding of a Triplet Transmitter to a Nanocrystal Photosensitizer

Ist Teil von

• Angewandte Chemie, 2017-05, Vol.129 (20), p.5690-5694

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Owing to the difficulty in comprehensively characterizing nanocrystal (NC) surfaces, clear guidance for ligand design is lacking. In this work, a series of bidentate bis(pyridine) anthracene isomers (2,3‐PyAn, 3,3‐PyAn, 2,2‐PyAn) that differ in their binding geometries were designed to find the best complementary fit to the NC surface. The efficiency of triplet energy transfer (TET) from the CdSe NC donor to a diphenylanthracene (DPA) acceptor mediated by these isomers was used as a proxy for the efficacy of orbital overlap and therefore ligand binding. 2,3‐PyAn, with an intramolecular N–N distance of 8.2 Å, provided the best match to the surface of CdSe NCs. When serving as a transmitter for photon upconversion, 2,3‐PyAn yielded the highest upconversion quantum yield (QY) of 12.1±1.3 %, followed by 3,3‐PyAn and 2,2‐PyAn. The TET quantum efficiencies determined by ultrafast transient absorption measurements showed the same trend. Transmitteroptimierung: Eine Serie von zweizähnigen Bis(pyridin)anthracenen mit unterschiedlichen Bindungsgeometrien wurde synthetisiert, um die am besten passende Spezies für die Oberfläche von CdSe‐Nanokristallen zu finden. Die Effizienz des Triplettenergietransfers vom CdSe‐NC‐Donor zu einem Diphenylanthracen‐Akzeptor über diese Transmitter wurde als Maß für die Orbitalüberlappung und Ligandenbindung genutzt.