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Upstream product

• 101133-41-9 bis(3-nitro-4-hydroxyphenyl)ethane 
• 6052-84-2 4,4'-ethylenediphenol 
• 1657-55-2 1,2-bis(4-methoxyphenyl)ethane 
• 120-44-5 1,4-di(4-methoxyphenyl)ethanone 

Relevant academic research and scientific papers

Exciton and charge-transfer interactions in nonconjugated merocyanine dye dimers: Novel solvatochromic behavior for tethered bichromophores and excimers

A series of merocyanine dye dimers tethered at different sites with spacers ranging from 0 to 5 methylene groups and the corresponding monomer have been synthesized. The formation, structure, and excited-state properties of the consequent merocyanine dye "aggregates" in solutions and in rigid glass have been studied by UV/visible absorption spectra, steady-state fluorescence, and fluorescence lifetime measurements. The dimers with 0 and 1 methylene spacers must exist in more-or-less extended conformations; consequently, they show a very weak and distance-dependent "J"-type exciton coupling, evident in both absorption and fluorescence spectra. For the dimers with 2, 3, and 5 methylene spacers, absorption spectra in nonpolar solvents are consistent with a largely extended configuration and little or no evident exciton coupling. However, for more polar solvents, a blue-shifted absorption spectrum is observed, suggesting a folded configuration resulting in an "H" dimer. For the latter dimers, fluorescence spectra in a variety of solvents show a pronounced red-shift, which is attributed to a folded "excimer". As anticipated from its structure, the merocyanine monomer shows a weak positive solvatochromic effect that may be correlated using the Taft-Kamlet π* parameter. Remarkably, both the "J" coupled dimer (n = 0) and the dimers having 2-5 methylene groups show a much stronger solvatochromic behavior than the monomer. The strong solvatochromic effects in these tethered dimers may be attributed to interchromophoric charge-transfer interactions in both ground and excited states.

Bisbenzoxazines and pharmaceutical use

Compounds of the formula: STR1 wherein, R is H, alkyl, cycloalkyl, aryl, or heteroaryl; R1 is H, alkyl, cycloalkyl, aryl, heteroaryl, substituted heteroaryl, aralkyl, substituted aryl, halo, OR2, SR2, NR2, CF3, NO2, CN, COOR2, CHO, SO3 H or SO2 NH2, wherein R2 is H, methyl, ethyl or propyl; Y is STR2 Z is O, S, NH or CH2 ; X is --CH2 --, STR3 or --(CH2)n CHOH(CH2)n --; wherein R2 is H, methyl, ethyl or propyl; n is 1-10, and pharmaceutically acceptable salts thereof have antiallergy and antiinflammatory activity.