Abstract
In the coming years, multipurpose catalysts for delivering different products under the same chemical condition will be required for developing smart devices for industrial or household use. In order to design such multipurpose devices with two or more specific roles, we need to incorporate a few independent but externally controllable catalytically active centers. Through space crystal engineering, such an externally controllable multipurpose MOF-based photocatalyst could be designed. In a chemical system, a few mutually independent secondary reaction cycles nested within the principal reaction cycle can be activated externally to yield different competitive products. Each reaction cycle can be converted into a time crystal, where the time consuming each reaction step could be converted as an event and all the reaction steps or events could be connected by a circle to build a time crystal. For fractal reaction cycles, a time polycrystal can be generated. By activating a certain fractal event based nested time crystal branch, we can select one of the desired competitive products according to our needs. This viewpoint intends to bring together the ideas of (spatial) crystal engineering and time crystal engineering in order to make use of the time–space arrangement in reaction–catalysis systems and introduce new aspects to futuristic chemical engineering technology.
Highlights
Biological reaction cycles [1,2] with fractal pathways [3] are omnipresent, where catalytic cyclic events can be found inside a host catalytic cycle
The transcription factors (TF) are the DNA sequence-specific protein molecules that control the genetic information from a DNA to messenger RNA
We have seen that designing any supramolecular materials like supramolecular gels [12,13,14,15], pharmaceutical co-crystals [16] or metal–organic frameworks (MOFs) [17] by crystal engineering approach always need to have a quest of certain supramolecular synthons with the desired property and related functional groups at the molecular backbones
Summary
Biological reaction cycles [1,2] with fractal pathways [3] are omnipresent, where catalytic cyclic events can be found inside a host catalytic cycle. The events inside the clocks or time crystals get repeated against both time and space [8] To design such a multipurpose catalyst for carrying out chemical reactions, one needs to design the catalyst in such a way that, the same catalyst can be used for different purposes under similar conditions, except for one or two controllable parameters. No time repetition is needed here, as crystal lattice does not behave as a time depending repetitive event These MOF-based photocatalysts with multiple reaction centers should be designed in such a way that, the reaction centers can be activated by different light frequencies, and in the same chemical solution, they can generate different products. In the biological system, different chemical steps can happen in different places, e.g., photosynthesis (vide infra)
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