Pfrunder MC, Marshall DL, Poad BLJ, Stovell EG, Loomans BI, Blinco JP, Blanksby SJ, McMurtrie JC, Mullen KM. Exploring the Gas-Phase Formation and Chemical Reactivity of Highly Reduced M
8 L
6 Coordination Cages.
Angew Chem Int Ed Engl 2022;
61:e202212710. [PMID:
36102176 PMCID:
PMC9827999 DOI:
10.1002/anie.202212710]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Indexed: 01/12/2023]
Abstract
Coordination cages with well-defined cavities show great promise in the field of catalysis on account of their unique combination of molecular confinement effects and transition-metal redox chemistry. Here, three coordination cages are reduced from their native 16+ oxidation state to the 2+ state in the gas phase without observable structural degradation. Using this method, the reaction rate constants for each reduction step were determined, with no noticeable differences arising following either the incorporation of a C60 -fullerene guest or alteration of the cage chemical structure. The reactivity of highly reduced cage species toward molecular oxygen is "switched-on" after a threshold number of reduction steps, which is influenced by guest molecules and the structure of cage components. These new experimental approaches provide a unique window to explore the chemistry of highly-reduced cage species that can be modulated by altering their structures and encapsulated guest species.
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