Success in Making Zn from Atomic Zn Encapsulated in an MFI-Type Zeolite with UV Light Irradiation.
For the first time, the paramagnetic Zn species was prepared successfully by the excitation with ultraviolet light in the region ascribed to the absorption band resulting from the 4s-4p transition of an atomic Zn species encapsulated in an MFl-type zeolite. The formed species gives a specific electr...
| Publicado en: | Journal of the American Chemical Society Vol. 135; no. 49; pp. 18481 - 18490 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
12/11/2013
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=93379869&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 93379869 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 12/11/2013 vid: 135 iid: 49 pid: 997 pub: American Chemical Society artinfo: ui: 93379869 10.1021/ja4077342 ppf: 18481 ppct: 9 formats: tig: atl: Success in Making Zn from Atomic Zn Encapsulated in an MFI-Type Zeolite with UV Light Irradiation. aug: au: Akira Oda Hiroe Torigoe Atsushi Itadani Takahiro Ohkubo Takashi Yumura Hisayoshi Kobayashi Yasushige Kuroda affil: Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima, Kita-ku, Okayama 700-8530, Japan Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan su: Zeolite analysis Ultraviolet radiation Density functional theory Singlet state (Quantum mechanics) Metal-ferroelectric-insulator-semiconductor structures sug: subj: Zeolite analysis Ultraviolet radiation Density functional theory Singlet state (Quantum mechanics) Metal-ferroelectric-insulator-semiconductor structures ab: For the first time, the paramagnetic Zn species was prepared successfully by the excitation with ultraviolet light in the region ascribed to the absorption band resulting from the 4s-4p transition of an atomic Zn species encapsulated in an MFl-type zeolite. The formed species gives a specific electron spin resonance band at g = 1.998 and also peculiar absorption bands around 38,000 and 32,500 cm which originate from 4s- 4p transitions due to the Zn+ species with paramagnetic nature that is formed in MFI. The transformation process (Zn → Zn) was explained by considering the mechanism via the excited triplet state ( P) caused by the intersystem crossing from the excited singlet state ( P) produced through the excitation of the 4s-4p transition of an atomic Zn species grafted in MFI by UV light. The transformation process was well reproduced with the aid of a density functional theory calculation. The thus-formed Zn species which has the doublet spin state exhibits characteristic reaction nature at room temperature for an O molecule having a triplet spin state in the ground state, forming an η type of Zn-O- species. These features clearly indicate the peculiar reactivity of Zn+ in MFI, whereas Zn-(H)MFI hardly reacts with O at room temperature. The bonding nature of [Zn-O-] species was also evidenced by ESR measurements and was also discussed on the basis of the results obtained through DFT calculations. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2013 holdings: @attributes: islocal: N |
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