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chemosensor
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Synthesis and Investigation of the Properties of Chromic Stimuli Responsive Polymers Based on Organic Compounds
, Ph.D. Dissertation Sharif University of Technology ; Pourjavadi, Ali (Supervisor)
Abstract
The main goal of this study is to prepare and investigate stimuli responsive structures that respond to the light and other environmental triggers. Also, investigating their applications in biological fields such as: drug delivery and tissue engineering, in addition to the application of these materials in the field of chemical sensors that show color change with changes in solvent, electric field and metal ions. In the matter of drug delivery, guest-host interactions were used to release anticancer drugs, in such a way that with ultraviolet light irradiation and simultaneously with the formation of the cis isomer, the connections between azobenzene groups and cyclodextrin rings are...
Synthesis of Light and pH Sensitive Gel with Nanophotochromic Cross-links and Investigation of its Applicability in Chemical Sensors
, M.Sc. Thesis Sharif University of Technology ; Pourjavadi, Ali (Supervisor)
Abstract
Photochromism is defined as a reversible transformation of a chemical species between two forms having different absorption spectra induced in one or both directions by photoirradiation. Among various organic photochromic compounds, including spiropyrans, azobenzenes, spirooxazines, dyarylethenes and fulgides, spiropyranes have been attracted more attention due to their more sensitivity towards photo, pH, heat, pressure and solvent polarity. UV irradiation of spiropyrans, breaks the C-O bond of pyran ring and makes cis-trans isomers. Therefore, closed structure of the molecule, named as spiro (SP), is converting into the flattered and conjugated merocyanine (MC). Mc is photochromism, polar...
Synthesis and Comparative Study on Complex Formation of Azo-bearing Nitrogen-Donor Macrocyclic Ligands with Fullerene C60 and Cu(II) Cation
, Ph.D. Dissertation Sharif University of Technology ; Ghanbari, Bahram (Supervisor)
Abstract
In the present research, a series of bimacrocyclic tweezer anchored through azobenzene moiety were synthesized and characterized by applying IR spectroscopy, 1H and 13C{1H} NMR, fluorescence spectroscopy, UV-visible spectroscopy, mass spectrometry and elemental analysis and in some cases by X-ray crystallography. Firstly, UV-visible spectroscopy established that the irradiation of the tweezers with UV light promoted the trans to cis isomerization. On the other hand, thermal cis-trans isomerization behavior of the azobenzene moiety in tweezers was surveyed in which the cis isomers were formed of the heating at 50 oC for 5 minutes. Where the -OH group was replaced with 4-toluenesulfonyl...