science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: benperidol Other Names: 1-{1-[4-(4-fluorophenyl)-4-oxobutyl]piperidin-4-yl}-1,3-dihydro-2H-benzimidazol-2-one Formula: C22H24FN3O2 CAS-No.: 983-42-6 PubChem: CID 16363 Study: uv absorption spectrum Authors: A.E.H. Gassim, P.G. Takla, K.C. James Title: Ultraviolet Spectrophotometry for the Determination of Benperidol by a Difference Procedure and for the Elucidation of its Polymorphic Structures Journal/Source: Analyst, 111, 923-926, (1986); DOI: 10.1039/AN9861100923 Data: table, diagram Energy/Wavelength range: 220 - 320 nm Resolution: Temperature: 298 K Temperature dependence: no Pressure/Concentration: 1.50 mg-% m/V Phase: solution (0.1 M sodium hydroxide and 0.05 M sulphuric acid) pH: Comments: Its ultraviolet absorption spectrum, in acidic or neutral aqueous solution, shows maxima due to the p-fluoroacetophenone chromophore (at 249 nm) and to the benzimidazolone chromophore (at 232 and 279 nm). In alkali, owing to ionisation, there is a bathochromic shift of the benzimidazolone absorption, and peaks occur at 220, 248 and 288 nm. Author to whom correspondence should be addressed: (e-mail address):