Alpha Cyclodextrin Dual Nitrogen Benzene Light Active Surfactant Molecular Recognition

The core scientic issues of the supramolecular self-assembly systems, such as thefield of molecular recognition, are to explore the nature of the interaction betweenhost and guest molecules, kinetic characteristics, characterization methods, andrelations between the structure and properties. In this research, molecular recognitionsystem consists of α-cyclodextrin as the host molecule and new type of seriesamphiphiles containing azobenzene chromophore as guest molecule that are designedand synthesized by using the solvothermal method. Azobenzene chromophore as anoptical probe, molecular recognition system interaction is characterized.Researchwork aregivenhere:Two kinds of surfactant were designed and synthesized. The first one is a kind ofnew surfactant Azo-C10-MDEA, which deals with the addition of azobenzene whichreacts when meets photo-controllable to surfactant. The structure and properties of thetwo new surfactant was characterized by various means such as Infrared spectra,Raman spectra, nuclear magnetic resonance(¹HNMR,¹³CNMR), elemental analyzer, etal.Azo-C10-PY, Azo-C10-MDEA can be reversibly changed formed byphoto-controllable. A multipeaks Gaussian fitting was used to interpret the spectra andgive integrating absorbance of peak, red-shift, half-width.Equilibrium constant ofinclusion compound（K_a） was5.2×10⁴L/mol.The inclusion complexofAzo-C10-MDEA withα-cyclodextrin can undergotrans-cis photoisomerizationreversibly.The Raman spectra and Infrared spectra of Azo-C10-MDEA, Azo-C10-MDEAand α-cyclodextrin physical mixture, Azo-C10-MDEA inclusion compound in thesolid state were obtained respectively by using fourier transform Raman spectrometerand Infrared spectrometer, and then the spectra were compared to reveal the structuralfeatures.Phenazine5,10-dioxide has been synthesized and its fluorescence emissionspectra has been determined in different solvents by overlap peaks of a principal peak and a shoulder peak, which are respectively assigned to dimer and monomer emissionpeaks. The maximum wavelength, peak area, and other spectral parameters forphenazine5,10-dioxide dimer and monomer were obtained from the analysis ofoverlap peaks by a multi-peaks Gaussian fitting method, then the value of relativeintegral emission intensity for dimer and monomer （I₂/I₁） in different solvents withvarious concentration can been obtained.