- Synthesis method of 1,2-di(2-(4-dimethoxyphenoxy) ethoxy) ethane
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The invention discloses a synthesis method of 1,2-di(2-(4-methoxyphenoxy) ethoxy) ethane, and aims to solve the problems of long reaction time, complex post-treatment and the like in the prior art. According to the method provided by the invention, 4-meth
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Paragraph 0025; 0026; 0027; 0035-0046
(2018/05/01)
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- Influence of cyclodextrins on the fluorescence of some short and long chain linked flexible bisbenzenes in aqueous solution
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The UV absorption, induced circular dichroism (icd) spectra, steady state and time resolved fluorescence emission of the flexible bisbenzenes 1-4 were obtained in aqueous solution and in presence of α-, β-, and γ-cyclodextrin (CD). Bisbenzenes 1 and 2 in an aqueous environment exhibit a dual emission which is differently affected by the CDs. The long-wavelength emission is quenched by α- and β-CD and enhanced by γ-CD. This is due to the formation of inclusion complexes between the CDs and 1 (2) in the ground state, in agreement with the modifications of the UV spectrum and the appearance of icd signals. On the basis of these effects and of the influence of the CDs on the 1 and 2 lifetimes, the dual emission of these bisbenzenes is attributed to a set of different ground-state conformations.
- Bortolus, Pietro,Monti, Sandra,Smoluch, Miroslawa,Bouas-Laurent, Henri,Desvergne, Jean-Pierre
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p. 1165 - 1171
(2007/10/03)
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- Synthesis of podands bearing aromatic end groups and complex formation with tropylium tetrafluoroborate in 1,2-dichloroethane
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A series of podands bearing phenyl, naphthyl and anthryl end groups were prepared and characterized. UV-visible spectrophotometry was used to investigate the host-guest chemistry of the podands in complexation with tropylium tetrafluoroborate in 1,2-dichloroethane. The results, are discussed and compared with those for previously studied systems containing crown ethers. The stability constants for these open-chain polyethers are in the range 5,1-8,4 dm3 mol-1, except for the podand having anthryl end groups [1,12 bis(anthryl-9)-2,5,8,11-tetraoxadodecane], which gives a 10-fold increase in the stability constant. Copyright
- Laemsae, Markku,Raitamaa, Kirsi,Pursiainen, Jouni
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p. 557 - 563
(2007/10/03)
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