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Excited-State Structural Dynamics of the Cubane-Type Metal Cluster [Cu4I4(py)4] Explored by Time-Resolved X-Ray
Doyeong Kim1,2, Hosung Ki1,2, Donghwan Im1,2
1Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 14, 2025
Summary
This study reveals the structural changes in copper(I) iodide cubane clusters after photoexcitation. The research identifies distinct excited states and their transformations, offering insights into photosensitive materials.
Area of Science:
- Materials Science
- Photochemistry
- Solid-State Chemistry
Background:
- Cubane-type metal clusters exhibit unique responses to external stimuli like light and electric fields.
- Structural adaptability is recognized as a key factor in these cluster responses.
- Experimental evidence for light-induced structural dynamics in these systems has been lacking.
Purpose of the Study:
- To investigate the structural dynamics of copper(I) iodide cubane (Cu4I4(py)4) upon photoexcitation.
- To provide direct experimental evidence for structural changes associated with photoexcitation.
- To establish benchmarks for theoretical studies of excited states in cubane-type clusters.
Main Methods:
- Time-resolved X-ray liquidography was employed to probe structural changes.
- Analysis focused on the picosecond and nanosecond timescales following photoexcitation.
- Characterization of distinct excited states and their decay pathways.
Main Results:
- Two distinct excited states, the cluster-centered triplet (3CC) and the (metal+halide)-to-ligand charge transfer triplet (3(M/X)LCT), were identified 100 ps post-excitation.
- The 3(M/X)LCT state decays with a 1.21 ns time constant, predominantly to the 3CC state.
- The 3CC state shows significant Cu4I4 core distortion and reduced symmetry, differing from prior theoretical models.
Conclusions:
- The study elucidates the structural transformations of copper(I) iodide cubane upon photoexcitation.
- The observed structural distortions in the 3CC state challenge existing theoretical frameworks.
- Findings enhance understanding of photosensitive metal-organic frameworks and their potential applications.
Keywords:
cubane‐type metal clustermolecular structural dynamicsreaction dynamicstime‐resolved X‐ray liquidographytime‐resolved X‐ray solution scatteringMore Related Videos
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