A -symmetric twisted organic salt as an efficient mechano-/thermo-responsive molecule: a reusable and sensitive fluorescent thermometer.

-Symmetric triaminoguanidinium chloride is condensed with -pentylphenothiazine carboxaldehyde to realise a thermally stable twisted organic salt on a gram scale. It appears as a nonmetallic economic salt having an integrated propeller shape with three tub-like cores and displays efficient reversible mechano- and thermo-fluorochromic behaviour. Unlike previous reports, the designed fluorescent, colorimetric thermometer works over a higher temperature range of 130-170 °C with five distinct colour variations.