Exploring cation distribution in ion-exchanged Al,Ga-containing metal-organic frameworks using ¹⁷O NMR spectroscopy.

ABSTRACT: A mixed-metal metal-organic framework, (Al,Ga)-MIL-53, synthesised by post-synthetic ion exchange has been investigated using solid-state nuclear magnetic resonance (NMR) spectroscopy, microscopy and energy dispersive X-ray (EDX) spectroscopy. ¹⁷O enrichment during the ion-exchange process enables site specific information on the metal distribution to be obtained. Within this work two ion-exchange processes have been explored. In the first approach (exchange of metals in the framework with dissolved metal salts), ¹⁷O NMR spectroscopy reveals the formation of crystallites with a core-shell structure, where the cation exchange takes place on the surface of these materials forming a shell with a roughly equal ratio of Al³⁺ and Ga³⁺. For the second a

SUBMITTER: Davis ZH 

PROVIDER: S-EPMC10395001 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature