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Keywords = aziridinium

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12 pages, 3115 KB  
Article
Synthesis, Photoluminescence and Vibrational Properties of Aziridinium Lead Halide Perovskites
by Dagmara Stefańska, Maciej Ptak and Mirosław Mączka
Molecules 2022, 27(22), 7949; https://doi.org/10.3390/molecules27227949 - 17 Nov 2022
Cited by 27 | Viewed by 7309
Abstract
Three-dimensional lead halide perovskites are known for their excellent optoelectronic properties, making them suitable for photovoltaic and light-emitting applications. Here, we report for the first time the Raman spectra and photoluminescent (PL) properties of recently discovered three-dimensional aziridinium lead halide perovskites (AZPbX3 [...] Read more.
Three-dimensional lead halide perovskites are known for their excellent optoelectronic properties, making them suitable for photovoltaic and light-emitting applications. Here, we report for the first time the Raman spectra and photoluminescent (PL) properties of recently discovered three-dimensional aziridinium lead halide perovskites (AZPbX3, X = Cl, Br, I), as well as assignment of vibrational modes. We also report diffuse reflection data, which revealed an extended absorption of light of AZPbX3 compared to the MA and FA counterparts and are beneficial for solar cell application. We demonstrated that this behavior is correlated with the size of the organic cation, i.e., the energy band gap of the cubic lead halide perovskites decreases with the increasing size of the organic cation. All compounds show intense PL, which weakens on heating and shifts toward higher energies. This PL is red shifted compared to the FA and MA counterparts. An analysis of the PL data revealed the small exciton binding energy of AZPbX3 compounds (29–56 meV). Overall, the properties of AZPbX3 are very similar to those of the well-known MAPbX3 and FAPbX3 perovskites, indicating that the aziridinium analogues are also attractive materials for light-emitting and solar cell applications. Full article
(This article belongs to the Special Issue Recent Developments in Perovskite-Based Functional Materials)
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17 pages, 4553 KB  
Review
Synthetic Applications of Aziridinium Ions
by Jala Ranjith and Hyun-Joon Ha
Molecules 2021, 26(6), 1774; https://doi.org/10.3390/molecules26061774 - 22 Mar 2021
Cited by 22 | Viewed by 6436
Abstract
Nonactivated aziridine with an electron-donating group at the ring nitrogen should be activated to an aziridinium ion prior to being converted to cyclic and acyclic nitrogen-containing molecules. This review describes ways to generate aziridinium ions and their utilization for synthetic purposes. Specifically, the [...] Read more.
Nonactivated aziridine with an electron-donating group at the ring nitrogen should be activated to an aziridinium ion prior to being converted to cyclic and acyclic nitrogen-containing molecules. This review describes ways to generate aziridinium ions and their utilization for synthetic purposes. Specifically, the intra- and intermolecular formation of aziridinium ions with proper electrophiles are classified, and their regio- and stereoselective transformations with nucleophiles are described on the basis of recent developments. Full article
(This article belongs to the Special Issue Aziridine Chemistry)
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13 pages, 1836 KB  
Article
Alkylative Aziridine Ring-Opening Reactions
by Jieun Choi, Taehwan Yu and Hyun-Joon Ha
Molecules 2021, 26(6), 1703; https://doi.org/10.3390/molecules26061703 - 18 Mar 2021
Cited by 6 | Viewed by 5870
Abstract
In this study, the highly strained three-membered aziridine ring was successfully activated as the aziridinium ion by alkylation of the ring nitrogen with a methyl, ethyl or allyl group, which was followed by ring opening with external nucleophiles such as acetate and azide. [...] Read more.
In this study, the highly strained three-membered aziridine ring was successfully activated as the aziridinium ion by alkylation of the ring nitrogen with a methyl, ethyl or allyl group, which was followed by ring opening with external nucleophiles such as acetate and azide. Such alkylative aziridine ring opening provides an easy route for the synthesis of various N-alkylated amine-containing molecules with concomitant introduction of an external nucleophile at either its α- or β-position. Full article
(This article belongs to the Special Issue Aziridine Chemistry)
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