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Updated: Jul 15, 2025
06:40
Synthesis of a Water-soluble Metal–Organic Complex Array
Published on: October 8, 2016
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Assembling of a Water-Soluble N^C^N-Coordinated Pt(II) Complex Aggregate Assisted by Carbon Dioxide in Basic Aqueous
Hiroyuki Mita1, Shingo Hattori1, Toshiyuki Sasaki1
1Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan.
Chemsuschem
|October 4, 2023
Summary
Carbon dioxide (CO2) triggers self-aggregation of a platinum complex in water, changing its color and forming complex structures. This CO2-induced self-assembly reveals new platinum-based materials with potential applications.
Area of Science:
- Coordination Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Platinum complexes are crucial in catalysis and materials science.
- Understanding self-aggregation phenomena is key to designing novel materials.
- Carbon dioxide (CO2) is an abundant and versatile C1 building block.
Purpose of the Study:
- To investigate the unprecedented self-aggregation of a platinum complex induced by CO2.
- To characterize the resulting aggregates and their structural properties.
- To elucidate the mechanism of CO2-triggered self-assembly in aqueous solution.
Main Methods:
- Synthesis and characterization of the platinum complex [Pt(L1)Cl].
- Spectroscopic studies (UV-Vis, transient absorption) to monitor aggregation.
- Single X-ray crystallography and elemental analysis for structural determination.
- Kinetic analysis using singular value decomposition.
Main Results:
- CO2 in basic aqueous solution induced self-aggregation of [Pt(L1)Cl], changing color from yellow to blue-green.
- CO2 bubbling led to strong absorption bands at 701 and 1152 nm, attributed to metal-metal-to-ligand charge-transfer.
- Polymorphic crystals (red and blue-green) were obtained; red form showed Pt-Pt stacked dimers bridged by carbonate, blue-green form exhibited linear arrays of [Pt(L2)(CO3)]3- units.
- Kinetic analysis indicated four species and a maximum aggregation degree of at least 32-mer.
Conclusions:
- A novel CO2-triggered self-aggregation pathway for platinum complexes in aqueous solution was discovered.
- The study revealed the formation of diverse supramolecular structures, including dimers and linear arrays.
- This work highlights the potential of CO2 as a stimulus for designing functional platinum-based materials.
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