Related Experiment Video
Updated: Oct 21, 2025

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
Strong Coupling Between Plasmons and Molecular Excitons in Metal-Organic Frameworks.
Alexander D Sample, Jun Guan, Jingtian Hu
1Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States.
This study shows strong coupling between molecular emitters in metal-organic frameworks (MOFs) and nanoparticle (NP) lattices, creating a polariton. This hybrid system opens new possibilities for excitonic materials in polariton chemistry.
Area of Science:
- Materials Science
- Chemistry
- Optics
Background:
- Strong coupling between light and matter is crucial for advanced optical devices.
- Metal-organic frameworks (MOFs) offer ordered structures for hosting molecular emitters.
- Plasmonic nanoparticle (NP) lattices provide enhanced light-matter interactions.
Purpose of the Study:
- To investigate strong coupling in a hybrid system of MOFs and plasmonic NPs.
- To explore the formation and properties of polaritons in this system.
- To demonstrate the potential of MOFs as excitonic materials for polariton chemistry.
Main Methods:
- Fabrication of MOF films with porphyrin-derived ligands on silver NP arrays.
- Angle-resolved optical measurements to study polariton formation.
- Transient absorption spectroscopy to analyze polariton decay dynamics.
- Solvent infiltration to tune coupling strength via refractive index changes.
Main Results:
- Observed formation of a lower-energy polariton in the MOF-NP lattice.
- Calculated a Rabi splitting of 110 meV, indicating strong coupling.
- Demonstrated systematic control of coupling strength by altering solvent refractive index.
- Identified distinct fast and slow decay components of the lower polariton due to energy transfer.
Conclusions:
- MOFs can act as effective excitonic materials for creating polaritons.
- The MOF-NP hybrid system enables tunable light-matter interactions.
- This work paves the way for novel applications in polariton chemistry and optics.
More Related Videos
07:14Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Related Concept Videos
Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Valence Bond Theory
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Bonding in Metals
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...