Photochromism of a spiro-functionalized diarylethene derivative: multi-colour fluorescence modulation with a photon-quantitative photocyclization reactivityElectronic supplementary information (ESI) available: Experimental details, crystallographic data in CIF and optical spectroscopic data. CCDC 1810980. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c8cc00566d

A spiro-functionalized photochromic diarylethene derivative showed multi-colour fluorescence modulation with a photon-quantitative photocyclization reactivity and high thermal stability. A spiro-functionalized photochromic diarylethene derivative showed multi-color fluorescence modulation with a photon-quantitative photocyclization reactivity.