science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: croconic acid Other Names: 4,5-dihydroxycyclopentenetrione Formula: C5H2O5 CAS-No.: 488-86-8 PubChem: CID 546874 Study: UV absorption spectra Authors: K.K. Hartley, A.R. Wolff, L.D. Travis Title: Croconic acid: An absorber in the Venus clouds? Journal/Source: Icarus, 77, 382-390, (1989); doi:10.1016/0019-1035(89)90095-X. Data: table, diagram Energy/Wavelength range: 210 - 430 nm Resolution: Temperature: 298 K Temperature dependence: no Pressure/Concentration: 20 µmole croconic acid per liter of concentrated sulfuric acid Phase: solution (sulfuric acid) pH: Comments: Croconic acid, a polymer of carbon dioxide, exhibits very strong absorption in the blue and near ultraviolet. Author to whom correspondence should be addressed: (e-mail address):