Benzoxazolyl stilbene

Fig. 9 (a) Molecular structure of bis(benzoxazolyl)stilbene (BBS), (b) Fluorescence spectra of a PP/BBS blend film containing 0.5 wt% of BBS before and after tensile deformation (c) Picture of the same material in which the center portion was uniaxially deformed. The image was taken under excitation with ultraviolet light, (b, c) adapted with permission from [50]. Copyright 2005 Wiley-... 

Beyond cyano-OPVs, several other dyes that form excimers in their aggregated state have also been used for mechanosensing purposes. Pucci and coworkers have reported that poly(propylene) (PP) films containing bis(benzoxazolyl)stilbene (BBS) (Fig. 9a) change photoluminescence color upon tensile deformation [50]. In the as-prepared state, the emission spectrum (Fig. 9b) shows a broad excimer emission band around 500 nm, along with sharper monomer emission bands at 410, 430, and 455 nm. Mechanical deformation lowers the intensity of the excimer band, resulting in a photoluminescence color change (Fig. 9c). 

CAS 1533-45-5 EINECS/ELINCS 216-245-3 Synonyms 4,4-Bis (benzoxazol-2-yl) stilbene 4,4-Bis (2-benzoxazolyl) stilbene... 

Benzoxazolyl)-4 -(5-methyl-2-benzoxazolyl) stilbene 5259-88-1 Oxycarboxin 5274-61-3 Ceteth-2 5274-63-5 Ceteth-4 5274-65-7 Oleth-2 5274-66-8 Oleth-3 5274-68-0 Akyporox RLM 40 Ameroxol LE-4 Brij 30 Brij 30SP Chemal LA-4 Dehydol LS 4 Dehydol LS 4 DEO DeTHOX LA-4 Emthox 5882 Ethal LA-4 Ethosperse LA-4 Hetoxol L-4 Hetoxol L-4N Hetoxol LA-4 Laureth-4 Lipocol L-4 Macol LA-4 Marlipal 24/40 Marlowet LA 4 Marlowet LMA 4 Mulsifan CPA Nikkol BL-4SY Nikkol BL-4.2 Phoenoxol L-4 Procol LA-4 Prox-onic LA-1/04 Remcopal 4 Simulsol P4 Trycol 5882 Unicoi LA-4 Unihydol LS-4 Witconol 5875 5280-68-2 Pigment red 146... 

The effect of solvent polarity on photoisomerization of trans-4,4 -bis(benzoxazolyl) stilbene has been reported [74]. On the basis of fluorescence quantum yield and lifetime measurements, the rate constants of radiative and nomadiative decays were calculated. In a polar solvent, a high fluorescence quantum yield was observed whereas a high rate of photoisomerization occurred in a nonpolar solvent. 

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