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The interplay between the molecular arrangement associated with the solvation process and crystal nucleation has been investigated by analysis of the piezo-solvatochromic behaviour of Reichardt's dye, ET(1), in methanol, ethanol and acetone under high pressure. High-pressure single-crystal X-ray diffraction and UV\u2013Vis spectroscopy reveal the impact of solute\u2013solvent interactions on the optical properties of ET(1). The study underscores the intricate relationship between solvent properties, molecular conformation and crystal packing. The connection between liquid and solid phases emphasizes the capabilities of high-pressure methods for expanding the field of crystal engineering. The high-pressure environment allowed the determination of the crystal structures reported here that are built from organic molecules fourfold solvated with ethanol or methanol: ET(1)\u00b74CH<jats:sub>3<\/jats:sub>OH and ET(1)\u00b74C<jats:sub>2<\/jats:sub>H<jats:sub>5<\/jats:sub>OH\u00b7H<jats:sub>2<\/jats:sub>O. The observed piezo-solvatochromic effects highlight the potential of ET(1) in nonlinear optoelectronics and expand the application of solvatochromic chemical indicators to pressure sensors.<\/jats:p>","DOI":"10.1107\/s2052252524004603","type":"journal-article","created":{"date-parts":[[2024,6,4]],"date-time":"2024-06-04T16:08:55Z","timestamp":1717517335000},"page":"528-537","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":6,"title":["Structural insight into piezo-solvatochromism of Reichardt's dye"],"prefix":"10.1107","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8234-2503","authenticated-orcid":true,"given":"Szymon","family":"Sobczak","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1439-7278","authenticated-orcid":true,"given":"Andrzej","family":"Katrusiak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2024,6,4]]},"reference":[{"key":"lt5066_bb1","doi-asserted-by":"crossref","first-page":"R11809","DOI":"10.1103\/PhysRevB.58.R11809","volume":"58","author":"Allan","year":"1998","journal-title":"Phys. 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