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Updated: Jul 20, 2025
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
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Macropolyhedral syn-B18H22, the "Forgotten" Isomer
Deepak Kumar Patel1,2, B S Sooraj1,2, Kaplan Kirakci2
1DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600036, India.
Journal of the American Chemical Society
|August 2, 2023
Summary
The "forgotten" syn-B18H22 isomer exhibits blue fluorescence and phosphorescence upon substitution, revealing unique microstructural effects. This study highlights novel boron-based luminescent materials and their potential in self-assembled monolayers.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Photophysics
Background:
- Macropolyhedral B18H22 clusters, particularly the anti-isomer, are known for photophysical properties and potential applications.
- The syn-B18H22 isomer has been largely overlooked due to reports of it being nonluminescent.
Purpose of the Study:
- To investigate the understudied syn-B18H22 isomer and its photophysical properties.
- To synthesize and characterize novel monothiol-substituted syn-B18H22 derivatives.
- To explore the luminescent behavior and potential applications of these boron clusters.
Main Methods:
- Combined theoretical and experimental investigations.
- Synthesis, separation, and structural characterization of three monothiol-substituted isomers: [1-HS-syn-B18H21] (1), [3-HS-syn-B18H21] (3), and [4-HS-syn-B18H21] (4).
- Characterization using NMR, mass spectrometry, single-crystal X-ray diffraction, IR, and luminescence spectroscopy.
Main Results:
- Syn-B18H22 exhibits blue fluorescence in crystalline form and phosphorescence upon substitution.
- Microstructural-dependent effects influence luminescence properties.
- First report of mechanochromic luminescence shift in a borane cluster; discovery of novel boron-based luminescent materials.
- Demonstrated utility of these clusters in carbon-free self-assembled monolayers.
Conclusions:
- Syn-B18H22 isomers, when substituted, display tunable luminescence, challenging previous assumptions of nonluminescence.
- The study expands the scope of boron-based luminescent materials and their applications.
- These substituted clusters show promise as components in self-assembled monolayers.
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