Supramolecular colorimetric pressure sensing: ratiometric quantification based on pressure-modulated association

Abstract

Supramolecular colorimetric pressure sensing in solution was achieved using silicon-bridged diazulenylmethyl cation 1_PF6, whose monomer–dimer equilibrium shifts under hydrostatic pressure. Pressurization promotes desolvation of the strongly solvated dimer to produce the monomer. The resulting pressure-induced equilibrium shift enables colorimetric sensing for quantitative pressure readout.