Intrinsic distortion in the analysis of the Jahn-Teller effect: by Transition state theory (TST) and Nitrogen inversion
Golrokh
Mahmoudzadeh
Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
author
text
article
2021
eng
AbstractIn the case of NH3, two reasonable geometries can be tried. Molecular orbitals are the main electronic structural units for analysis and solution of chemical problems at the electronic level and Quantum mechanical description of the changes in electronic structure due to distortions in molecular shape and vice versa is given in the form of the vibronic coupling theory. The most famous concept based on this theory is the Jahn−Teller (JT) effect. The second-order Jahn-Teller effect (SOJT) is an example of reactions proceeding by an interaction between the HOMO and the LUMO within the same molecule In the high-symmetry regular triangular configuration D3h with the N atom in the center, the ground-state configuration of the system is singlet 1A1, that in the direction coordinate instability of Qa2" with the time-dependent DFT (TD-DFT) calculations symmetry descents and to form a square-pyramidal structure. The intrinsic reaction coordinate (IRC) theory in the present paper is presented for further understanding of the mechanism of such distortion. Natural bond analysis (NBO) is used for illustrating the strongest interaction and natural atomic charges of these structures. The calculated energy profile has been supplemented with optimization by means of transition state theory (TST).
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
386
399
https://www.ijnc.ir/article_47982_4d8f9abb0f53ae8a9edc548756a1c2a2.pdf
dx.doi.org/10.22034/ijnc.2020.138177.1133
The Kinetic Study of Oleamide Synthesis: Effect of Oleic Acid Molar Ratio, Temperature and Catalyst Concentration
Zohre
Taherkhani
Chemical Process Design Research Group, ACECR, Faculty of Engineering, University of Tehran, P.O. Box 1417943851, Tehran, Iran
author
Omid
Shojaei
Chemical Process Design Research Group, ACECR, Faculty of Engineering, University of Tehran, P.O. Box 1417943851, Tehran, Iran
author
text
article
2021
eng
Oleamide is amide derivative of oleic acid that is frequently used as slip agent in polymer industry. The present study explores the kinetic of oleamide synthesis by ammonolysis reaction between oleic acid and urea instead of ammonia gas at atmospheric pressure in the presence of AlCl3 catalyst. The effect of oleic acid : urea molar ratio, temperature and catalyst concentration on the reaction kinetic was investigated and reaction rate constants were calculated. At low molar ratio of oleic acid:urea (i.e. up to 1:2), the reaction followed an overall second order kinetic and at higher molar ratio (i.e. 1:4 and 1:5), the pseudo first order dependence of rate respect to oleic acid was dominant at three examined temperatures and catalyst concentrations. The values of rate constant were increased by increasing the temperature and urea as well as AlCl3 concentration in which the highest amount was attributed to the operational condition of oleic acid: urea molar ratio of 1:4, temperature of 200 °C and AlCl3 catalyst concentration of 1 wt% that was selected as optimum condition for oleamide synthesis.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
400
412
https://www.ijnc.ir/article_239468_779c8d6ebde3c47a6446d1d47d8d35ff.pdf
dx.doi.org/10.22034/ijnc.2020.139153.1136
Monitoring of Sand Concentration in Some Oil Wells in the Niger Delta Area of Nigeria
Temple
Nwoburuigwe Chikwe
Department of Pure and Industrial Chemistry, University of Port Harcourt, Rivers State, Nigeria.
author
Nnaemeka
Ngobiri
Department of Pure and Industrial Chemistry, University of Port Harcourt, Rivers State, Nigeria.
author
text
article
2021
eng
The quantity of sand from five oil wells A, B, C, D, and E were determined by Sieving process. 20 Liters of crude oil from each of the wells were separated into five 5-liter poly cans with each poly can containing 4 liters of crude samples, 1-liter petroleum ether and 1 ml demulsifier. Crude oil samples from each well were sieved with a 70-mesh size (106 µm size) sieve to recover sand particles. This process was carried out for each of the wells for eight (8) consecutive days and wells were allowed a period of rest for three (3) months. The process was then repeated for another eight (8) consecutive days. Results obtained after sixteen (16) days of analyses show that the quantity of sand produced from each of these wells follow the trend E > C > A > B > D. Results obtained for the % increase in sand produced from wells A, B, C, D, and E were; 9.434, 12.180, 20.440, 20.000 and 20.000 % respectively. Results obtained from the extrapolated sand produced from wells A, B, C, D, and E with respect to their daily crude oil production were: 210,278.000, 85,800.000, 411,711.000, 17,150.000 and 577,500.000 g respectively.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
413
424
https://www.ijnc.ir/article_47819_d6e021d0464b15aa47a6ab95f2b3d096.pdf
dx.doi.org/10.22034/ijnc.2020.47819
A density functional theory study on nanostructures including sumanene, corannulene and nanosheet as the anodes in Be−ion Batteries
Fatemeh
Gharibzadeh
Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
author
Esmail
Vessally
Department of Chemistry, Payame Noor University, Tehran, Iran
author
Ladan
Edjlali
Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
author
Moosa
Es haghi
Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
author
Robab
Mohammadi
Department of Chemistry, Payame Noor University, Tehran, Iran
author
text
article
2021
eng
ABSTRACTA theoretical study were performed to examine the interactions between the Be neutral atom and Be2+ ion and three sheet-Like nanoparticles such as sumanene (SM), corannulene (CN) and graphene, which are computed by M06−2X /6−31+G(d,p) method. The estimated values of adsorption energy (Ead) are all negative in Be2+̶ nanoparticles interaction. These results can be understood in terms of the electrostatic potentials of the negative sites on nanoparticles with which the positive regions on the Beryllium ion are interacting. In this article, the cell voltage (V) is the most important parameter for Be−ion batteries.It also determines the usability of a battery in an electrical system, and many battery parameters depend on voltage. Nevertheless, the Vcell for CN was obtained the highest value. The Vcell of Be−ion batteries are increased in the order: CN > SM > graphene > SM-i > CN-i. The mentioned nanoparticles as the anodes in BeiBs.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
425
441
https://www.ijnc.ir/article_244460_ea054978a832aa4852bfafb20e9b9b75.pdf
dx.doi.org/10.22034/ijnc.2021.528323.1158
Synthesis and characterization of oleamide slip agent
Zohre
Taherkhani
Chemical Process Design Research Group, ACECR, Faculty of Engineering, University of Tehran, P.O. Box 1417943851, Tehran, Iran
author
Omid
Shojaei
Chemical Process Design Research Group, ACECR, Faculty of Engineering, University of Tehran, P.O. Box 1417943851, Tehran, Iran
author
text
article
2021
eng
The present paper explores a new economical method for the synthesis of oleamide in the presence of catalyst at atmospheric pressure. Oleamide is mainly synthesized by ammonolysis of fatty acid or esters with ammonia gas at high pressure. Yet, using the urea instead of ammonia gas provides an economical reaction at atmospheric pressure. The structure of synthesized oleamide is characterized by FTIR analysis. The effect of oleic acid / urea molar ratio, time and temperature of reaction as well as amount of catalyst on the acid values or conversion of reaction is studied. The optimum condition for the synthesis of oleamide from oleic acid and urea is obtained to be oleic acid / urea molar ratio of 1:4, temperature of 200 ℃ and time reaction of 180 min with 1 wt% catalyst concentration. At this condition the acid value of 56 was achieved. Also, the reaction mechanism and kinetic were investigated in which ammonolysis followed pseudo-first order kinetics.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
442
452
https://www.ijnc.ir/article_239387_760a3d50de27db01e42cd145f5af9a26.pdf
dx.doi.org/10.22034/ijnc.2020.138604.1134
Assessment of the Total Petroleum Hydrocarbons and Heavy Metal Concentrations in Soils around Car Washing Stations in Misurata, Libya
Mohamed
Elbagerma
Department of Chemistry, Faculty of Science, University of Misurata, Misurata, Libya
author
Mohamed
Alkog
Department of Chemistry, Faculty of Science, University of Misurata, Misurata, Libya
author
Adel
Alajtal
Department of Chemistry, Faculty of Science, University of Misurata, Misurata, Libya
author
Howell
Edwards
Centre for Astrobiology and Extremophile Research, School of Life Sciences, University of Bradford, Bradford
author
text
article
2021
eng
Car washing generates a lot of wastewater which flows into our environment through a wastewater network or drains directly into the soil carrying with it contaminants. This study assessed the heavy metal and total petroleum hydrocarbon concentrations in wastewater from car washing stations and the surrounding soils in Misurata city, Libya. Pollution indices, such as the contamination factor (CF) and geoaccumulation index (Igeo), were used to assess the heavy metal and total petroleum hydrocarbon contamination status and ecological risk in the wastewater and soil from car washing stations. The results obtained in this study show that the average pH of the soil samples inside the stations ranged between 6.6 -8.53, while outside the stations the pH ranged from 5.97-8.63 and in sediments 6.8-8.44. The results for the heavy metal contamination studied indicate that the average cadmium concentration in soil samples inside and outside the washing stations ranged from 0.013-0.018 ppm and 0.013-0.25 ppm, respectively, and the average cadmium concentration in sediment samples ranged between 0.05-0.23 ppm. Also, the concentration of lead in soil samples inside and outside the stations and in the sediments ranged from 0.21-0.85, 0.19-1.06 and 0.21- 1.06 ppm, respectively. The total petroleum hydrocarbon concentration levels obtained in this study were between 389-7000 mg/kg for the soil samples inside the stations, whereas in soil samples outside the stations the concentration ranged from 27000-55000 mg/kg. Some environmental indicators were used to determine the environmental status of the particular washing stations studied.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
453
473
https://www.ijnc.ir/article_47820_7e57fed7a479687ab6b1736481794640.pdf
dx.doi.org/10.22034/ijnc.2020.136633.1130
Structural, Magnetic and Electromagnetic Absorption Properties of SrFe11.98Mg0.1Sn0.1O19/BaTiO3 Nanocomposites Prepared By Sol- Gel Auto Combustion Method
kamelia
Ghaffarzadeh
Department of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran
author
pirouz
derakhshi
Department of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran
author
Mohammad
Yousefi
Department of Chemistry, Yadegar-e Imam Khomeini (RAH) Shahr-e Rey Branch, Islamic Azad University, Tehran, Iran
author
ali
mahmoudi
Department of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran
author
parviz
aberoomand azar
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
text
article
2021
eng
In this research, first, nanoparticles of SrFe11.98Mg0.1Sn0.1O19 hexaferrite was synthesized via sol-gel autocombustion process and then the nanocomposites of hexagonal ferrites/perovskite with the amounts of SrFe11.98Mg0.1Sn0.1O19 /BaTiO3 (50/50, 40/60, 70/30 w/w) was prepared by ball-milling method. FTIR spectra were shown that the bands at about 400 and 500 cm-1 proved the formation of hexagonal ferrites. XRD analysis was confirmed the formation of hexaferrite and perovskite phase of BaTiO3. FESEM pictures was represented the formation of hexagonal nanoparticles and sphere shape of BaTiO3. VSM hysteresis loop was revealed that SrFe11.98Mg0.1Sn0.1O19 belonged to the soft magnetic materials due to the 604.45Oe coercivity. By formation of nanocomposites the coercivity was increased up to 1500 Oe. VNA analysis was VNA analysis revealed that the maximum absorption of -16.4db at 11.5 GHz frequency for SrFe11.98Mg0.1Sn0.1O19 /BaTiO3 (60/40) nanocomposite. Microwave absorption properties of samples was investigated by (vector network analyzer) VNA. The maximum value of reflection loss was --16.4db at 11.5 GHz frequency for SrFe11.98Mg0.1Sn0.1O19 /BaTiO3 (60/40) nanocomposite.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
474
484
https://www.ijnc.ir/article_39229_b95333a0f45e2f90798958a2899b2aed.pdf
dx.doi.org/10.22034/ijnc.2020.119891.1086
Adsorption of procarbazine anti-cancer Drug on the Surface of graphene: A DFT Study
Behnam
Farhang Rik
Department of Inorganic Chemistry, Faculty of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran
author
Roya
ranjineh khojasteh
Department of Inorganic Chemistry, Faculty of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran
author
Roya
Ahmadi
Department of Chemistry, College of Basic Sciences, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
author
text
article
2021
eng
The present study aimed to assess the adsorption of graphene with anticancer drug procarbazine in a gas and solvent phase (water) at the B3LYP/6-31G (d) theoretical level. Initially, the structures of procarbazine and graphene complexes were optimized in three configurations. Afterwards, IR calculations and molecular orbital analysis were performed. In addition, some important parameters were assessed, including the adsorption energy, Gibbs free energy changes (ΔGad), enthalpy (ΔHad) variations, thermodynamic equilibrium constant, specific heat capacity, chemical hardness, energy gap, and electrophilicity. According to the results, Gibbs free energy changes (ΔGad), enthalpy (ΔHad) variations, I-Isomer and II-Isomer and III-Isomer were negatives at various temperatures, throughout the temperature range of 298.15-310.15 K. Since according to the obtained results for adsorption of procarbazine on the graphene in I-Isomer and II-Isomer and III-Isomer were spontaneous at various temperatures, throughout the temperature range of 298.15-310.15 K. Structural properties calculated, including the density and length of C-N bonds, and the findings of the analysis of molecular orbitals indicated that the reactivity, electrophilicity, and conductivity of procarbazine are reduced after this reaction. Also the calculated specific heat capacity values indicated that graphene could be utilized as a sensing material in the construction of thermal biosensors for procarbazine determination.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
485
497
https://www.ijnc.ir/article_244676_65838fc791cf25c2b66f37e794edea51.pdf
dx.doi.org/10.22034/ijnc.2021.533255.1167
Designing novel molecule (V-NNC) based on Voxelotor (GBT-440) against sickle cell disease (SCD) via binding to carbonmonoxy hemoglobin S
Mehdi
Nabati
Research and Development Department, Nanogostar-e-Mihan Pharmaceutical Company, Tehran, Iran
author
Farzaneh
Malekian
Research and Development Department, Shari Pharmaceutical Company, Tehran, Iran
author
Akbar
Forghani
Research and Development Department, Nanogostar-e-Mihan Pharmaceutical Company, Tehran, Iran
author
Elham
Pournamdari
Department of Science, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran
author
Vida
Bodaghi-Namileh
Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences,
author
text
article
2021
eng
Sticking cell disease is a defect in hemoglobin structure that leads to deficiency in oxygen transferring to tissues. Voxelotor is a new compound that achieved FDA approve to treat SCD, recently. In this study, we aimed to introduce novel structure based on the voxelotor to cure the mentioned condition more effectively. At the beginning, various properties of Voxelotor including electronic properties, reactivity and stability were assessed via B3LYP/6-311++G(d,p) method and Global Reactivity in said method that revealed Voxelotor is a stable compound with low reactivity. In addition, docking potential of Voxelotor into active site of hemoglobin S was investigated. Then, several molecules were designed and optimized based on the Voxelotor structure. Docking and physicochemical properties of investigated molecules were analyzed. Results of presented study revealed that between four molecules (V-NNC, V-NNN, V-CNC and V-CNN) with higher potential to interact with Hemoglobin S in comparison with Voxelotor, only V-NNC has the optimum physicochemical features. So, molecular structure screening and evaluating of Voxelotor and designing novel compounds based on it leads to introducing an optimized molecule with suitable potential to treat SCD.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
498
514
https://www.ijnc.ir/article_39729_405680f1cc2a0b411db3688ee198381c.pdf
dx.doi.org/10.22034/ijnc.2020.122059.1097
Synthesis of polyphenolic mesoporous nanocomposite for removal of acid dye from aqueous media: Adsorption studies
Alireza
Golshan Tafti
Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
Abosaeed
Rashidi
Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
Mohammad Esmail
Yazdanshenas
Department of Textile Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
author
Habib-Allah
Tayebi
Department of Textile Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
author
text
article
2021
eng
The aim of this study is immobilization of mesoporous silica by tannin (tannin@SBA-15) for removal of acid blue 62 from aqueous media and determines the adsorption isotherm, thermodynamic and kinetic parameters. The characterization of adsorbent was carried out by different techniques such as Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N2 adsorption/desorption, scanning electron microscope (SEM) and transmission electron microscope (TEM). UV-Vis spectrophotometer was also applied to determine the amount of remaining dye in the solution. The Effect of some parameters such as pH, adsorbent dosage and contact time for removal of acid blue 62 was examined and optimized at temperatures ranging from 25 to 45 ⁰C. For determining the type of Isotherm model, Langmuir, Freundlich and Temkin were used and for attaining the Thermodynamic parameters such as changes in Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS), Vant Hoff equation were applied. Optimum values were pH of 2, contact time of 90 min and absorbent dosage of 0.03 g. The Langmuir isotherm model showed very good agreement with the equilibrium data with maximum adsorption capacity of 1000 mg/g. The thermodynamic analysis also revealed that the adsorption process was feasible, spontaneous and exothermic. The results also indicated that the adsorption of acid blue 62 onto Tannin-aminated SBA-15 follows the pseudo-second order kinetic model. Tannin@SBA-15 has a good potential for acid blue 62 dye adsorption from aqueous media.
International Journal of New Chemistry
Iranian Chemical Science and Technologies Association
2645-7237
8
v.
4
no.
2021
515
536
https://www.ijnc.ir/article_47848_863025b41a3acb5a2d31ac59c1064b19.pdf
dx.doi.org/10.22034/ijnc.2020.128383.1116