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31.
The effect of electric field and Al doping on the sensitivity of hexa‐peri‐hexabenzocoronene nanographene to chloropicrin 下载免费PDF全文
Akram Hosseinian Arezoo Gharachorloo Tarlan Mohazzab Lighvani Parvaneh Delir Kheirollahi Nezhad Esmail Vessally 《应用有机金属化学》2018,32(10)
It has been previously reported that the recently synthesized hexa‐peri‐hexabenzocoronene (HBC) nanographene cannot detect toxic chloropicrin (CP) gas. To overcome this problem, we examined the effect of Al doping and applying an electric field on the sensitivity of HBC towards CP gas by means of density functional theory calculations. We found that the Al‐doping process significantly increases the adsorption energy of CP gas from ?7.1 to ?39.9 kcal mol?1 but decreases the sensitivity of HBC. By applying an electric field, the HBC is polarized with two different electrostatic potentials on its different surfaces, which increases the adsorption energy. By increasing the electric field strength, the adsorption energy and electronic sensitivity of HBC are increased. We predicted that in the presence of an electric field of about ?0.025 au, HBC can act as an electronic senor or a work function‐type sensor with a short recovery time. At this field, the electrical conductivity of HBC is significantly increased on CP adsorption which generates an electrical signal. Increasing the electric field to higher intensities is not favourable because of increasing recovery times, and decreasing it to lower intensities reduces the sensitivity of HBC. 相似文献
32.
Theoretical study addressing the effects of tautomerism and explicit/implicit water molecules on NQR and NMR parameters of tetrazole‐5‐thione 下载免费PDF全文
Arezoo Tahan 《Magnetic resonance in chemistry : MRC》2017,55(7):606-618
DFT/B3LYP calculations were employed to study the effects of tautomerism and explicit/implicit water molecules on Nuclear Quadrupole Resonance (NQR) and Nuclear Magnetic Resonance (NMR) tensors of nitrogen nuclei in tetrazole‐5‐thione structure. The obtained results revealed that nuclear quadrupole coupling constant (χ) and isotropic chemical shielding (σiso) values of nitrogen nuclei in tetrazole ring of five possible tautomeric forms of tetrazole‐5‐thione, i.e. two thione forms called tautomers A and E and three thiol forms called tautomers B, C, and D, were functions of resonance energy(E2) values of nitrogen lone pairs. Furthermore, it was observed that by increasing participation of lone pairs of nitrogen atoms in the ring resonance interactions, the σiso values around them were increased, while their χ and qzz values were decreased. However, the results indicated that with exception of tautomer B, the order of qzz and χ values of nitrogen nuclei in tetrazole ring was exactly opposite of the order of resonance energy values for the same nitrogen nuclei in all tautomers and their mono‐hydrated complexes. In addition, a significant decrease was noticed in χ and qzz values when a water molecule was put in different positions near the tetrazole ring in tautomers A–E. The mentioned result can be attributed to hydrogen bond formation between nitrogen nuclei and the oxygen of water. In mono‐hydrated complexes, the σiso values around nitrogen atoms acting as hydrogen donors in hydrogen bond formation (N―H….OH2) were decreased, while its values were increased for nitrogen atoms acting as hydrogen acceptors in hydrogen bond formation(N….H―OH). Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
33.
Hakemi Pejman Ghadi Arezoo Mahjoub Soleiman Zabihi Ebrahim Tashakkorian Hamed 《Russian Journal of Applied Chemistry》2021,94(3):388-401
Russian Journal of Applied Chemistry - The present study aimed to design PCL–PEG–PCL copolymer as novel nanocarrier for co-loading of docetaxel (DTX) and quercetin (Qu) drugs and... 相似文献
34.
Davoud?DorranianEmail author Seyedeh?Arezoo?Ahmadi Afshar Negar?Tahmasebi Atefeh?Fotovat Eskandari 《Journal of Cluster Science》2014,25(4):1147-1156
The effect of laser fluence on the characteristics of Cu nanoparticles, prepared by laser ablation method, is investigated experimentally. 1–6 nm Cu nanoparticles were synthesized by the pulsed laser ablation of a high purity copper bulk in acetone. Effect of laser fluence on the size, morphology and structure of produced nanoparticles has been studied. Pulses of a Q-switched Nd:YAG laser of 1,064 nm wavelengths at 7 ns pulse width at different fluences was employed to irradiate the Cu target in acetone. The UV–Vis–NIR absorption spectra of nanoparticles exhibit surface plasmon resonance absorption peak in the visible region. TEM and SEM micrographs indicate that with increasing the laser fluence the average size of spherical Cu nanoparticles is decreased and only the sample which is produced with the highest fluence shows exceptional behavior. It is found that Cu nanoparticles exhibit photoluminescence emission with single peak due to its interband transition. 相似文献
35.
Umar Rashid Elarbi Chatir Leonardo Medrano Sandonas PA Sreelakshmi Arezoo Dianat Rafael Gutierrez Gianaurelio Cuniberti Saioa Cobo Veerabhadrarao Kaliginedi 《Angewandte Chemie (International ed. in English)》2023,62(16):e202218767
By employing a mechanically controllable break junction technique, we have realized an ideal single molecular linear actuator based on dithienylethene (DTE) based molecular architecture, which undergoes reversible photothermal isomerization when subjected to UV irradiation under ambient conditions. As a result, open form (compressed, UV OFF) and closed form (elongated, UV ON) of dithienylethene-based molecular junctions are achieved. Interestingly, the mechanical actuation is achieved without changing the conductance of the molecular junction around the Fermi level over several cycles, which is an essential property required for an ideal single molecular actuator. Our study demonstrates a unique example of achieving a perfect balance between tunneling width and barrier height change upon photothermal isomerization, resulting in no change in conductance but a change in the molecular length, which results in mechanical actuation at the single molecular level. 相似文献
36.
Adsorption of phenolic compounds from aqueous solutions using carbon nanoporous adsorbent coated with polymer 总被引:1,自引:0,他引:1
Phenolic compounds are a widespread class of water pollutants that are known to cause serious human health problems; and the demand for effective adsorbents for the removal of toxic compounds is increasing.In this work adsorption of phenol, resorcinol and p-cresol on mesoporous carbon material (CMK-1) and modified with polyaniline polymer (CMK-1/PANI) has been investigated in attempt to explore the possibility of using nanoporous carbon as an efficient adsorbent for pollutants. It was found that CMK-1/PANI exhibits significant adsorption for phenolic derivatives. Batch adsorption studies were carried out to study the effect of various parameters like adsorbent dose, pH, initial concentration and contact time. From the sorption studies it was observed that the uptake of resorcinol was higher than other phenolic derivatives. Freundlich and Langmuir adsorption isotherms were used to model the equilibrium adsorption data for phenolic compounds. 相似文献
37.
Mehdi Bakavoli Farid Moeinpour Arezoo Sardashti‐Birjandi Abolghasem Davoodnia 《Journal of heterocyclic chemistry》2013,50(2):188-193
Reaction of 4‐chlorobenzonitrile oxide ( 2 ) which was generated in situ with acrylo nitrile ( 3 ), vinyl acetate ( 4 ) and allyl bromide ( 5 ) as dipolarphile afforded the new cycloadducts 6a , 7a , and 8a compounds, respectively. Reactivity and regiochemistry of these reactions were investigated using activation energy calculations and density functional theory‐based reactivity indexes. The theoretical 13C NMR chemical shifts of the cycloadducts which were obtained by gauge‐invariant atomic orbital method were comparable with the observed values. 相似文献
38.
Rastegari Arezoo Safavi Maliheh Vafadarnejad Fahimeh Najafi Zahra Hariri Roshanak Bukhari Syed Nasir Abbas Iraji Aida Edraki Najmeh Firuzi Omidreza Saeedi Mina Mahdavi Mohammad Akbarzadeh Tahmineh 《Molecular diversity》2022,26(1):409-428
Molecular Diversity - Alzheimer’s disease (AD) is now ranked as the third leading cause of death after heart disease and cancer. There is no definite cure for AD due to the multi-factorial... 相似文献
39.
Kharazmi Arezoo Ghorbani-Vaghei Ramin Noori Samira Alavinia Sedigheh 《Research on Chemical Intermediates》2022,48(4):1313-1329
Research on Chemical Intermediates - Recently, magnetic iron oxide nanoparticles functionalized with various organic groups increasing attention in the synthesis of the organic compounds. In this... 相似文献
40.
M. Sc. Dominik L. Pastoetter M. Sc. Shunqi Xu M. Sc. Mino Borrelli Dr. Matthew Addicoat Dr. Bishnu P. Biswal Dr. Silvia Paasch Dr. Arezoo Dianat Dr. Heidi Thomas Dr. Reinhard Berger Prof. Dr. Sebastian Reineke Prof. Dr. Eike Brunner Prof. Dr. Gianaurelio Cuniberti Dr. Marcus Richter Prof. Dr. Xinliang Feng 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(52):23827-23832