Synthetic and Post-Synthetic Methods towards Fine Tuning the Chemical and Physical Properties of Metal-Organic Frameworks

This thesis explores synthetic and post-synthetic strategies for tailoring the chemical and physical properties of metal-organic frameworks (MOFs), with a particular emphasis on modulating redox activity, framework composition, and ionic conductivity. The first part of the work focuses on leveraging MOF-embedded polynuclear metal clusters for multi-electron redox chemistry. A square-planar tetramanganese cluster was shown to reversibly interconvert between molecular oxygen and metal-oxo species via a four-electron pathway. This reactivity was then investigated by varying the identity and redox potential of the metal centers within the tetrametal cluster. The Fe(II) and Co(II) analogs reveal distinct metal-specific behavior and provide insight into the tunability of redox-active SBUs within MOFs. Next, post-synthetic cation exchange was employed to access a previously unreported Zn-based MOF, ZnZnBTT, which exhibits significant Zn-ion conductivity due to mobile charge-balancing cations. This material demonstrates the potential of MOFs in next-generation solid-state battery technologies. Finally, the impact of linker electron donicity on cluster structure and reactivity was explored using a new mixed-azolate ligand. Four isostructural MOFs incorporating Co, Ni, Cu, and Cd were synthesized, revealing that the electron-rich pyrazolate groups modulate cluster composition and redox behavior. Notably, CoBTDP exhibits O₂ reactivity, unlike its all-tetrazolate counterpart, underscoring the role of linker design in tuning MOF function. Together, these studies demonstrate how careful control over MOF synthesis and post-synthetic modification can be used to fine-tune redox behavior, framework composition, and ion transport, providing new avenues for the design of functional porous materials.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Chemistry

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2025

Author dc:creator

• Iliescu, Andrei

Advisor dc:contributor.advisor

• Dincă, Mircea

Statement dc:rights

• Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
• Copyright retained by author(s)

Licence dc:rights.uri

• https://creativecommons.org/licenses/by-sa/4.0/

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/162333

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/162333