Room temperature O transfer from N 2 O to CO mediated by the nearest Cd(i) ions in MFI zeolite cavities

Research output: Contribution to journalArticle

Abstract

The dominant oxidation state of cadmium is +ii. Although extensive investigations into the +ii oxidation state have been carried out, the chemistry of Cd I is still largely underdeveloped. Here, we report a new functionality of cadmium created by the zeolite lattice: room temperature O transfer from N 2 O to CO mediated by the nearest monovalent cadmium ions in MFI zeolite. Thermal activation of Cd II ion-exchanged MFI zeolite in vacuo affords the diamagnetic [Cd I -Cd I ] 2+ species with a short Cd I -Cd I σ bond (2.67 Å). This species generates two Cd I sites under UV irradiation through homolytic cleavage of the Cd I -Cd I σ bond, and the thus-formed nearest Cd I sites abstract an O atom from N 2 O to generate the [Cd II -O b -Cd II ] 2+ core, where O b means bridged oxygen. This bridging atomic oxygen species is transferred to CO at room temperature, through which CO oxidation and regeneration of the Cd I -Cd I σ bond then proceed. This is the first example pertaining to the reversible redox reactivity of the nearest monovalent cadmium ions toward stable small molecules. In situ spectroscopic characterization captured all the intermediates in the reaction processes, and these data allowed us to calibrate the density-functional-theory cluster calculations, by means of which we were able to show that the charge compensation requirement at the nearest two Al sites arrayed circumferentially in the 10-membered ring of MFI zeolite creates such novel functionalities of cadmium. The unprecedented reactivity of Cd I and its origin are discussed.

Original languageEnglish
Pages (from-to)2308-2317
Number of pages10
JournalDalton Transactions
Volume48
Issue number7
DOIs
Publication statusPublished - Jan 1 2019

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Zeolites
Carbon Monoxide
Cadmium
Ions
Oxidation
Temperature
Oxygen
Density functional theory
Chemical activation
Irradiation
Atoms
Molecules

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Room temperature O transfer from N 2 O to CO mediated by the nearest Cd(i) ions in MFI zeolite cavities . / Oda, Akira; Ohkubo, Takahiro; Kuroda, Yasushige.

In: Dalton Transactions, Vol. 48, No. 7, 01.01.2019, p. 2308-2317.

Research output: Contribution to journalArticle

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