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Valleix R, Zhang W, Jordan AJ, Guillemeney L, Castro LG, Zekarias BL, Park SV, Wang O, Owen JS. Metal Fluorides Passivate II-VI and III-V Quantum Dots. Nano Lett 2024. [PMID: 38712788 DOI: 10.1021/acs.nanolett.4c00610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Quantum dots (QDs) with metal fluoride surface ligands were prepared via reaction with anhydrous oleylammonium fluoride. Carboxylate terminated II-VI QDs underwent carboxylate for fluoride exchange, while InP QDs underwent photochemical acidolysis yielding oleylamine, PH3, and InF3. The final photoluminescence quantum yield (PLQY) reached 83% for InP and near unity for core-shell QDs. Core-only CdS QDs showed dramatic improvements in PLQY, but only after exposure to air. Following etching, the InP QDs were bound by oleylamine ligands that were characterized by the frequency and breadth of the corresponding ν(N-H) bands in the infrared absorption spectrum. The fluoride content (1.6-9.2 nm-2) was measured by titration with chlorotrimethylsilane and compared with the oleylamine content (2.3-5.1 nm-2) supporting the formation of densely covered surfaces. The influence of metal fluoride adsorption on the air stability of QDs is discussed.
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Affiliation(s)
- Rodolphe Valleix
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- Univ. Lyon, ENS de Lyon, CNRS, Laboratoire de Chimie, Lyon, 69342, France
| | - William Zhang
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Abraham J Jordan
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Lilian Guillemeney
- Univ. Lyon, ENS de Lyon, CNRS, Laboratoire de Chimie, Lyon, 69342, France
| | - Leslie G Castro
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Bereket L Zekarias
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Sungho V Park
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Oliver Wang
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jonathan S Owen
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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Yan G, Zekarias BL, Li X, Jaffett VA, Guzei IA, Golden JE. Divergent 2-Chloroquinazolin-4(3H)-one Rearrangement: Twisted-Cyclic Guanidine Formation or Ring-Fused N-Acylguanidines via a Domino Process. Chemistry 2020; 26:2486-2492. [PMID: 31912567 DOI: 10.1002/chem.201905219] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/05/2020] [Indexed: 12/23/2022]
Abstract
A highly efficient 2-chloroquinazolin-4(3H)-one rearrangement was developed that predictably generates either twisted-cyclic or ring-fused guanidines in a single operation, depending on the presence of a primary versus secondary amine in the accompanying diamine reagent. Exclusive formation of twisted-cyclic guanidines results from pairing 2-chloroquinazolinones with secondary diamines. Use of primary amine-containing diamines permits a domino quinazolinone rearrangement/intramolecular cyclization, gated through (E)-twisted-cyclic guanidines, to afford ring-fused N-acylguanidines. This scalable, structurally tolerant transformation generated 55 guanidines and delivered twisted-cyclic guanidines with robust plasma stability and an abbreviated total synthesis of an antitumor ring-fused guanidine (4 steps, 55 % yield).
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Affiliation(s)
- Gang Yan
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI, 53705, USA
| | - Bereket L Zekarias
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI, 53705, USA
| | - Xiaoyu Li
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI, 53705, USA
| | - Victor A Jaffett
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI, 53706, USA
| | - Ilia A Guzei
- Molecular Structure Laboratory, Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI, 53706, USA
| | - Jennifer E Golden
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI, 53705, USA.,Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI, 53706, USA
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