Engineering topics
Botros, Youssry Y.
Publications and source records attributed to Botros, Youssry Y..
Electrochemically addressable trisradical rotaxanes organized within a metal–organic framework
Significance This research paper presents a strategy for the organization of artificial molecular switches based on mechanically interlocked molecules within a porous crystalline framework. Once arranged within the pores of the framework, the electronic state of the switches can be altered by the application of an electrochemical potential. This strategy is particularly useful when it comes to integrating dynamic, stimulus-responsive, mechanically interlocked molecules with the robustness and periodicity of porous solids. The findings of the research establish proof-of-concept for the application of postsynthetic transformations of porous crystalline frameworks in the creation of solid-state molecular switches and machines.
Carbohydrate-Mediated Purification of Petrochemicals
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Semiconducting Single Crystals Comprising Segregated Arrays of Complexes of C 60
Although pristine C 60 prefers to adopt a face-centered cubic packing arrangement in the solid state, it has been demonstrated that noncovalent-bonding interactions with a variety of molecular receptors lead to the complexation of C 60 molecules, albeit usually with little or no control over their long-range order. Herein, an extended viologen-based cyclophane—ExBox 2 4+ —has been employed as a molecular receptor which, not only binds C 60 one-on-one, but also results in the columnar self-assembly of the 1:1 inclusion complexes under ambient conditions. These one-dimensional arrays of fullerenes stack along the long axis of needle-like single crystals as a consequence of multiple noncovalent-bonding interactions between each of the inclusion complexes. Furthermore, the electrical conductivity of these crystals is on the order of 10 –7 S cm –1 , even without any evacuation of oxygen, and matches the conductivity of high-quality, unfunctionalized C 60 -based materials that typically require stringent high-temperature vaporization techniques, along with the careful removal of oxygen and moisture, prior to measuring their conductance.