Dissertation
Elucidation of Phase Distributions in Engineered Tetraphenylethene-Based Metal−Organic Framework Systems
Washington State University
Doctor of Philosophy (PhD), Washington State University
05/2025
DOI:
https://doi.org/10.7273/000007394
Abstract
The field of metal–organic frameworks (MOFs) has rapidly evolved from disconnected examples of multi-dimensional coordination polymers into an expansive collection of functional materials containing over 100,000 structures. Because any material’s chemical structure dictates its function, a robust structural understanding is a crucial prerequisite for the optimization of a material’s physical properties and its effective deployment towards an application. This is especially true for MOFs, which frequently demonstrate multiple possible structures from a single metal-ligand combination. Without proper identification, these phase distributions confuse analysis and hinder applicability of the material(s). Conversely, when well-understood, phase multiplicity serves to increase the number of available structures (and functions) within an established chemical window. Thus, control over phase distributions in MOF systems is a critical aspect of their analysis and utility.
In this work, a luminescent ligand based on the tetraphenylethene (TPE) molecule is used as a foundation to generate three distinct MOF systems, which are analyzed for their essential structures and functional properties. All three TPE-based systems are found to demonstrate various degrees of phase multiplicity; while some distributions depend solely on the initial synthetic conditions to generate distinct framework isomers, others undergo dynamic and reversible phase transformations according to their post-synthetic treatments. These structural aspects are characterized in detail, and mechanistic explanations are presented that can be applied to broad design principles towards phase-controlled MOF systems.
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Details
- Title
- Elucidation of Phase Distributions in Engineered Tetraphenylethene-Based Metal−Organic Framework Systems
- Creators
- Hannah M. Johnson
- Contributors
- Qiang Zhang (Chair)James Boncella (Committee Member)Xiaofeng Guo (Committee Member)Zachariah Heiden (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Chemistry
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 214
- Identifiers
- 99901220326601842
- Language
- English
- Resource Type
- Dissertation