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Supramolecular colorimetric pressure sensing: ratiometric quantification based on pressure-modulated association
Tomoyuki Hamachi1, Iori Okamura2, Shigehiro Yamaguchi3
1Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. gaku@ms.ifoc.kyushu-u.ac.jp.
Chemical Communications (Cambridge, England)
|May 14, 2026
Summary
A novel silicon-bridged diazulenylmethyl cation enables colorimetric pressure sensing in solution. Increased pressure shifts the monomer-dimer equilibrium, allowing for quantitative pressure detection through color changes.
Area of Science:
- Supramolecular chemistry
- Materials science
- Chemical sensing
Background:
- Developing new methods for pressure sensing in solution is crucial for various scientific applications.
- Existing pressure sensors may have limitations in sensitivity, range, or applicability in liquid environments.
Purpose of the Study:
- To develop a novel supramolecular system for colorimetric pressure sensing in solution.
- To investigate the pressure-induced equilibrium shift of a silicon-bridged diazulenylmethyl cation for quantitative pressure readout.
Main Methods:
- Utilized a silicon-bridged diazulenylmethyl cation (1PF6) as the core sensing element.
- Investigated the monomer-dimer equilibrium of the cation under varying hydrostatic pressures.
- Observed colorimetric changes associated with the pressure-induced shift in equilibrium.
Main Results:
- Demonstrated that hydrostatic pressure shifts the monomer-dimer equilibrium of the cation.
- Showed that pressurization leads to desolvation of the dimer, favoring monomer formation.
- Achieved quantitative pressure readout through observable colorimetric changes.
Conclusions:
- Supramolecular colorimetric pressure sensing in solution is feasible using the designed silicon-bridged diazulenylmethyl cation.
- The pressure-induced shift in monomer-dimer equilibrium provides a reliable mechanism for sensing and quantifying pressure.
- This approach offers a new avenue for developing solution-based optical pressure sensors.
