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Comparative Studies on Adduct Compounds of Schiff-Base Donors and Some Organic and Inorganic Acceptors
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Boghaei, Davar (Supervisor)
Abstract
The charge transfer interaction of two Schiff-bases Bis- (2-thiophene methylene)-1,4- Benzene Di amine and Bis (2-thiophene methylene)-1,3- Benzene Di amine as donors with iodine and tetracyano ethylene as Electron acceptors have been studied spectrophotometrically. The formation constants and extinction coefficients of charge transfer complexes have been determined by graphical as well as iterative methods. From measurements at different temperatures the thermodynamic functions of the charge transfer complex formation have been studied. The temperature dependence of the K can be used for the determination of the thermodynamic reaction quantities (ΔG˚, ΔS˚, ΔH˚) for linear regression fits...
A stacked neural network approach for yield prediction of propylene polymerization
, Article Journal of Applied Polymer Science ; Volume 116, Issue 3 , May , 2010 , Pages 1237-1246 ; 00218995 (ISSN) ; Shahsavan, H ; Bolouri, O ; Taranejoo, S ; Goodarzi, V ; Torabi Angaji, M ; Sharif University of Technology
2010
Abstract
Prediction of reaction yield as the most important characteristic process of a slurry polymerization industrial process of propylene has been carried out. Stacked neural network as an effective method for modeling of inherently complex and nonlinear systems-espe-cially a system with a limited number of experimental data points-was chosen for yield prediction. Also, effect of operational parameters on propylene polymerization yield was modeled by the use of this method. The catalyst system was Mg(OEt)2/DIBP/TiCl 4/PTES/AlEt3, where Mg(OEt)2, DIBP (diisobutyl phthalate), TiCl4, PTES (phenyl triethoxy silane), and triethyl aluminum (AlEt3) (TEAl) were employed as support, internal electron...
Charge Transfer Complexes of Substituted Bis (thiophen-2-Ylmethylene)Benzene-1,4-Diamine Schiff Bases with Iodine and TCNE
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Boghaei, Davar (Supervisor)
Abstract
The charge transfer interaction of two Schiff-bases 2,5-dichloro -bis(thiophen-2-ylmethylene)benzene-1,4-diamine and 2,5-dimethyl-bis(thiophen-2- ylmethylene) benzene-1,4-diamine as donors with I2 and TCNE ethylene as acceptors have been studied spectrophotometrically.
The formation constants and extinction coefficients of charge transfer complexes have been determined by graphical as well as iterative methods. From measurements at different temperatures the thermodynamic functions of the charge transfer complex formation have been studied. The temperature dependence of the K can be used for the determination of the thermodynamic reaction quantities (ΔG, ΔS, ΔH) for linear regression...
The formation constants and extinction coefficients of charge transfer complexes have been determined by graphical as well as iterative methods. From measurements at different temperatures the thermodynamic functions of the charge transfer complex formation have been studied. The temperature dependence of the K can be used for the determination of the thermodynamic reaction quantities (ΔG, ΔS, ΔH) for linear regression...
Investigation and Study of Microstructure, Dielectric and Non-ohmic Properties of tin and Cobalt Oxide Systems Co-Doped with Electron Donor and Acceptor Elements
, M.Sc. Thesis Sharif University of Technology ; Nemati, Ali (Supervisor) ; Maleki Shahraki, Mohammad (Supervisor)
Abstract
In recent years, there are continuous researches on replacing new dielectrics with suitable dielectric properties (including high dielectric coefficient, low loss factor, high breakdown voltage, and high nonlinear coefficient simultaneously). One of these new materials is co-doped titanium oxide with donor and acceptor of electron, which in spite of having high dielectric coefficient and low loss factor. it has low breakdown voltage and researches on improving the disadvantages of this dielectric are ongoing. Due to the structural similarities between tin oxide and titanium oxide, the tin oxide can be an interesting system for studying and improving disadvantages in this field. In this study...
New organic dyes with diphenylamine core for dye-sensitized solar cells
, Article Journal of Materials Science: Materials in Electronics ; Volume 29, Issue 8 , April , 2018 , Pages 6323-6336 ; 09574522 (ISSN) ; Karami, M ; Hosseinzadeh, B ; Ghahary, R ; Sharif University of Technology
Springer New York LLC
2018
Abstract
In the current investigation, four novel donoracceptor type organic dyes including (DPA-Ba, DPA-Hy, DPA-Rh, DPA-Cy), are proposed and their photophysical and electrochemical properties as well as dye-sensitized solar cell performance are systematically investigated. Among these dyes diphenylamine is utilized as an-electron donor while barbituric acid, hydantoin, rhodanine-n-acetic acid and cyano acetic acid, are proposed as anchoring groups as dye-sensitized solar cells (DSSCs). The synthesized dyes are characterized using FT-IR, NMR, mass spectrometry, absorbance and electrochemical measurements. The photophysical, electrochemical and photovoltaic properties of the solar cells based on...
Charge-transfer complexes of 4-nitrocatechol with some amino alcohols
, Article Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy ; Volume 75, Issue 3 , 2010 , Pages 970-977 ; 13861425 (ISSN) ; Najafpour, M. M ; Boghaei, D. M ; Sharif University of Technology
2010
Abstract
Charge-transfer (CT) complexes formed from the reactions of 4-nitropyrocatechol (4-nCat) as an electron acceptor with four amino alcohols: 2-aminoethanol, 1-amino-2-propanol, 4-aminobutanol and N-(2-hydroxyethyl)-1,3-diaminopropane (NHEDAP) as electron donors, have been studied spectrophotometrically in H2O and H2O/EtOH at 20, 25, 30, 35 and 40 °C. The calculated values of the oscillator strength and transition moment confirm the formation of CT-complexes. The thermodynamic and spectroscopic parameters were also evaluated for the formation of CT-complexes. The equilibrium constants ranged from 9.00 to 2.20 l mol-1 (M-1). These interactions are exothermic and have relatively large standard...