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Hossein Dehghani,Mohammad Reza Mansournia 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
A series of sitting-atop (SAT) complexes, [(ZrO)H2t(X)pp(NO3)2], have been prepared via the reactions of free base meso-tetraarylporphyrins, H2t(X)pp, with zirconyl nitrate hydrate, ZrO(NO3)2·xH2O. The products have been characterized by a variety of methods including 1H NMR, 13C NMR, IR and UV-Vis spectroscopies, elemental analysis and conductance measurements. The data indicate that the meso-tetraarylporphyrins coordinate with two pyrrolenine nitrogen atoms to the zirconyl cation located above the distorted porphyrin plane and two protons remain on the pyrrole nitrogens. Such half sandwich-type sitting-atop complexes may be considered as models for the initial steps of the metallation of the macrocycles.
Dehghani, Hossein,Mansournia, Mohammad Reza Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
A series of sitting-atop (SAT) complexes, [(ZrO)$H_2t(X)pp(NO_3)_2$], have been prepared via the reactions of free base meso-tetraarylporphyrins, $H_2$t(X)pp, with zirconyl nitrate hydrate, ZrO(N$O_3)_2{\cdot}xH_2$O. The products have been characterized by a variety of methods including $^1H\;NMR,\;^{13}C$ NMR, IR and UV-Vis spectroscopies, elemental analysis and conductance measurements. The data indicate that the meso-tetraarylporphyrins coordinate with two pyrrolenine nitrogen atoms to the zirconyl cation located above the distorted porphyrin plane and two protons remain on the pyrrole nitrogens. Such half sandwich-type sitting-atop complexes may be considered as models for the initial steps of the metallation of the macrocycles.
Hossein Dehghani,Sara Bakhshayesh,Maryam Shaterian,Leila Motamedi 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Free base meso-tetraarylporphyrins (H2T(X)PP) react with tellurium(IV) chloride (TeCl4) in mild conditions for formation sandwich intermediate sitting-atop (i-SAT) complexes, [TeCl4(H2T(X)PP)2]. 1H NMR, 13C NMR, UV-vis, FT-IR and elemental analysis were used for characterization of the products. In the proposed structure of the i-SAT complexes,four pyrroles of each porphyrin ring are tilted alternatively up and down and this appropriates suitable orientation of lone pairs of two pyrrolenine nitrogens for electron donation to a tellurium center. 1H NMR and FT-IR results showed that in the produced complex, hydrogen atoms of porphyrin macrocycles remained on the pyrrole nitrogens.
Dehghani, Hossein,Bakhshayesh, Sara,Shaterian, Maryam,Motamedi, Leila Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Free base meso-tetraarylporphyrins ($H_2T(X)PP$) react with tellurium(IV) chloride ($TeCl_4$) in mild conditions for formation sandwich intermediate sitting-atop (i-SAT) complexes, [$TeCl_4(H_2T(X)PP)_2$]. $^1H$ NMR, $^{13}C$ NMR, UV-vis, FT-IR and elemental analysis were used for characterization of the products. In the proposed structure of the i-SAT complexes, four pyrroles of each porphyrin ring are tilted alternatively up and down and this appropriates suitable orientation of lone pairs of two pyrrolenine nitrogens for electron donation to a tellurium center. $^1H$ NMR and FT-IR results showed that in the produced complex, hydrogen atoms of porphyrin macrocycles remained on the pyrrole nitrogens.
A decision support system for diagnosis of distress cause and repair in marine concrete structures
Masoud Dehghani Champiri,Faramarz Moodi,S. Hossein Mousavizadegan 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.2
Marine Structures are very costly and need a continuous inspection and maintenance routine. The most effective way to control the structural health is the application of an expert system that can evaluate the importance of any distress on the structure and provide a maintenance program. An extensive literature review, interviews with expert supervisors and a national survey are used to build a decision support system for concrete structures in sea environment. Decision trees are the main rules in this system. The system input is inspection information and the system output is the main cause(s) of distress(es) and the best repair method(s). Economic condition, severity of distress, distress situation, and new technologies and the most repeated classical methods are considered to choose the best repair method. A case study demonstrates the application of the developed decision support system for a type of marine structure.
Ali Dehghani,Ghasem Bahlakeh,Bahram Ramezanzadeh,Amir Hossein Mostafatabar 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
In the present work, for thefirst time, a series of unique zinc-centered metal–organicfilms with highanti-corrosion potency was fabricated on the steel surface through the covalent/non-covalent bonding/interactions between the naturalflavonoid based-molecules (Quercetin) and Zn2+/Fe2+ metal-cations. Thevisualized steel surface micro-scale microstructure by FE-SEM proved that the Quercetin:Zn based metal–organicfilm covered the metallic surface significantly. Also, the elemental analysis of the protectedsurfaces via GIXRD, EDS, and mapping experiments illustrated that the metal–organic compoundssufficiently adsorbed. Tafel curves achievements depicted that the Quercetin:Zn based metal–organicfilmcould efficiently protect the iron surface via both O2 reduction/Fe oxidation mechanisms and theoutcomes indicated that in the presence of Quercetin (200 ppm):Zn (600 ppm) inhibitors the mostprotectivefilm against chloride solution was attained (97% efficiency) after 24 h of iron exposure. Additionally, the theoretically derived outcomes applying MC/MD modeling associated with DFTcalculations ascertained the interactions followed by adsorption of complexes over the M-Steel.
Mohammad Hadi Dehghani,Maryam Faraji,Amir Mohammadi,Hossein Kamani 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Natural pumice (NP), FeCl3·6H2O modified pumice (FEMP) and hexadecyl trimethyl ammonium bromide (HDTM.Br) modified pumice (HMP) were used for fluoride adsorption. The effect of pH (3-11), initial concentration (2-15mg/L), and adsorbent dosage (0.2-0.8 g/L) on the defluoridation was optimized by using central composite design (CCD) in the response surface methodology (RSM). Results showed optimum condition in the pH=3, initial concentration=2mg/L, and adsorbent dosage=0.71, 0.75, 0.70 g/L with the maximum removal efficiency of 9.39, 76.45, and 95.09% for NP, FEMP, and HMP, respectively. The adsorption equilibrium and kinetic data was in good agreement with Freundlich and pseudo-second order reaction. Thermodynamic parameters indicated a non-spontaneous nature for NP and spontaneous nature for FEMP and HMP. Positive enthalpy illustrated the endothermic nature of the process. On the basis of results, modification of pumice led to an increase in the fluoride removal efficiency.
A simple accurate model for prediction of physical properties of petroleum fractions
Mohammad Reza Dehghani,Hossein Parhizgar 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
We utilized genetic programming approach for generation of a new model for prediction of critical properties and acentric factor of petroleum fractions. Usually for estimation of critical properties, molecular weight, specific gravity and boiling point are needed, while in this work in order to present an applicable model, just the boiling point and specific gravity have been used as the model parameters. Our results showed that using new correlations, critical temperature, pressure, volume and acentric of petroleum fractions can be correlated within 0.07, 0.65, 0.45 and 0.79 percent average absolute relative deviation. respectively.