Structural Formula Vector Image
Title: BBOT
CAS Registry Number: 7128-64-5
CAS Name: 2,2¢-(2,5-Thiophenediyl)bis[5-(1,1-dimethylethyl)benzoxazole]
Additional Names: 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene; C.I. Fluorescent Brightener 184
Trademarks: Uvitex OB (Ciba)
Molecular Formula: C26H26N2O2S
Molecular Weight: 430.56
Percent Composition: C 72.53%, H 6.09%, N 6.51%, O 7.43%, S 7.45%
Literature References: High mol wt fluorescent whitening agent. Prepn: P. Liechti et al., CH 427822 (1967 to Ciba); Z. Seha, C. D. Weis, Helv. Chim. Acta 63, 413 (1980). Fluorescence depolarization studies: G. R. Fleming et al., Chem. Phys. Lett. 51, 399 (1977). Photostability study: G. Tury et al., J. Photochem. Photobiol. A 114, 51 (1998).
Properties: Yellow to green powder, mp 196-202°. Flash pt: >350°C. d20 1.26. Vapor pressure (20°): 2.6´10-8 Pa. Soly at 20° (%w/w): water <0.01; acetone 0.5; chloroform 14; ethyl acetate 1; n-hexane 0.2; methanol <0.1. Absorption max (cyclohexane): 374 nm. Emission max (cyclohexane): 435 nm.
Melting point: mp 196-202°
Flash point: Flash pt: >350°C
Absorption maximum: Absorption max (cyclohexane): 374 nm
Density: d20 1.26
Use: Optical brightener additive in polymers, fibers, films, inks, laquers, and paints. In liquid scintillators.

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