Publication date: 15th February 2023
Including Artificial Molecular Machines (AMMs) in densely packed and ordered matrices is a crucial step for developing molecular architectures with sophisticated functionalities. In this way, we develop metal-organic frameworks (MOFs) with amphidynamic properties: fast rotational frequency of specific molecular components embedded within an open, rigid framework. We previously demonstrated that a water-stable MOF named PEPEP-PIZOF-0, exhibits multiple rotational rates due to the electronic structure of the linker, with and without the presence of highly interacting molecular guests.[1]
Controlling dynamics is a crucial step towards functional advanced materials; for this reason, we decided to modify the linker through a Post-synthetic Modification with Bromine.[2] Subsequently, the internal dynamics were studied through solid-state NMR (13CPMAS and 2H echo spin), using deuterated isotopologues with 2H enriched samples showing significant changes in the motion. This work opens the way to develop materials with chemically modulated local dynamic properties aimed to generate coupled and organized AAMs as in an Artificial Molecular Factory (AFM).[3]
We acknowledge the financial support from CONACYT and PAPIIT. We thank R. A. Toscano, M. C. García González, M. A. Peña, E. Huerta, V. Gómez-Vidales, U. Hernández-Balderas and A. Nuñez Pineda for technical support. The authors thank UNAM for support related to UNAM's BGSI node.
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