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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: 3,crystal structure,2,Binuclear palladium(II) complex,1-Methyl-1H-1,4-tetrazole-5-thiol,Mizoroki-Heck reaction
- چکیده:
- چکیده انگلیسی: A new binuclear paddle-wheel palladium(II) complex of [Pd2(μ-mtzt)4]dmgH2 (1) has been prepared by the treatment of PdCl2 in acetonitrile with mixture of 1-methyl-1H-1,2,3,4-tetrazole-5-thiol (Hmtzt) and dimethylglyoxime (dmgH2) in methanol. Resulted complex was characterized by elemental analysis (CHNS), IR, UV–Vis absorption, 1H NMR spectroscopy and its structure was determined with single-crystal X-ray diffraction. Single crystal analysis reveals that this complex has binuclear structure in a paddle-wheel fashion with Pd-Pd distances of 2.808(2)Å. Also, in this binuclear complex, each palladium(II) ion has a slightly distorted square-pyramidal coordination geometry with the two nitrogen and two sulfur atoms in equatorial positions from four bridges mtzt- ligands and the second palladium subunit in axial position. Catalytic potentiality of complex 1 is also exhibited in the Mizoroki–Heck coupling reactions between a range of aryl halides and olefins. The catalyst shows very much efficient reactivity in the Mizoroki–Heck reactions giving high yield of the coupling products.
- انتشار مقاله: 10-06-1398
- نویسندگان: Vahid Amani,Akram Sadat Delbari,Ali Akbari,Mohammad Reza Poor Heravi,Mojtaba Amini
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanoparticles,Oxidation,Sulfide,Spinel,FeCo2O4
- چکیده:
- چکیده انگلیسی: We report the preparation and characterization of spinel-structured FeCo2O4 nanoparticles for the efficient and selective oxidation of sulfides. The as-prepared FeCo2O4 nanoparticles were characterized by powder X-ray diffraction (PXRD), energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). According to TEM images, the size of the FeCo2O4 particles is identified to be 10– 20 nm. The obtained FeCo2O4 nanoparticles were used as an efficient catalyst for oxidation of sulfides. For all sulfide substrates, very good conversions (69-100%) and selectivities (89-99%) depending on the nature of the sulfide substrates were obtained. The reusability and recoverability of catalyst show that the catalytic system can be reused fourth times without significant loss of reactivity and stability.
- انتشار مقاله: 15-06-1398
- نویسندگان: Mojtaba Amini,Samaneh Aghamohamadi,Sanjeev Gautam,Keun Hwa Chae
- مشاهده
- جایگاه : پژوهشی
- مجله: Nanochemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Immobilization,Epoxidation,Molybdenum,Polysiloxane
- چکیده:
- چکیده انگلیسی: In this study, a new recoverable catalyst for the epoxidation of olefins was developed using a layered polysiloxane as a support for immobilizing (salen) molybdenum(VI) complex by electrostatic interaction between the surface of the solid support and the electrically charged molybdenum complex. Characterization of the heterogeneous catalyst by Fourier transform infrared, XRD,1H NMR, and atomic absorption spectroscopes as well as thermogravimetric and CHN elemental analyses confirmed successful immobilization of the (salen) molybdenum(VI) complex to the support. The prepared catalyst catalyzed the epoxidation of olefins efficiently. The effect of different factors on the epoxidation of cyclooctene was investigated. Reaction conditions including reaction temperature, solvent type, substrate amount, catalyst amount and oxidant amount were systematically optimized in order to achieve the highest conversion of cyclooctene. Various other olefins showed high catalytic activity and selectivity under the optimal reaction conditions. Regenerability test demonstrated that the catalyst can be recycled for at least five times without leaching of molybdenum. Moreover, the catalyst showed good stability under the reaction conditions as determined by FT-IR and ICP-OES analyses.
- انتشار مقاله: 21-04-1396
- نویسندگان: Mojtaba Bagherzadeh,Hadiseh Mohammadabadi,Sara Abednatanzi,Alireza Abbasi,Mojtaba Amini
- مشاهده
- جایگاه : پژوهشی
- مجله: Nanochemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: TiO2,Nanoparticles,Photocatalytic degradation,ZnO
- چکیده:
- چکیده انگلیسی: Nanoparticles of the ZnO and TiO2 were synthesized and the physicochemical properties of the compounds were characterized by IR, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD patterns of the ZnO and TiO2 nanoparticles could be indexed to hexagonal and rutile phase, respectively. Aggregated nanoparticles of ZnO and TiO2 with spherical-like shapes were observed with particle diameter in the range of 80-100 nm. These nanoparticles were used for photocatalytic degradation of various dyes, Rhodamine B (RhB), Methylene blue (MB) and Acridine orange (AO) under solar light irradiation at room temperature. Effect of the amount of catalyst on the rate of photodegradation was investigated. In general, because ZnO is unstable, due to incongruous dissolution to yield Zn(OH)2 on the ZnO particle surfaces and thus leading to catalyst inactivation,the catalytic activity of the system for photodegradation of dyes decreased dramatically when TiO2 was replaced by ZnO.
- انتشار مقاله: 09-09-1378
- نویسندگان: Mojtaba Amini,Mahdi Ashrafi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: dimension,acrylic resin,dental disinfectants,post and core technique
- چکیده:
- چکیده انگلیسی: Introduction: The purpose of this study was to compare dimensional changes of two types of auto polymerizing acrylic resin patterns (APARPs) in three different storing environments. Methods: 60 acrylic post and core patterns were made of two types of Duralay acrylic resins (Aria dent, Iran and Reliance, Dental Mfg. Co, USA) using a canine model. Then coronal, apical diameter and coronoapical length of patterns were measured. Afterwards, they were divided into two categories of 30 for each type of Duralay acrylic resin type. Each category was divided into three groups of ten randomly to immerse in three storage environments (Deconex®53plus Borer ChemieAG, Switzerland), Unident ® Impre(USF Healthcare S.A, Sweitzerland) and water. After one hour, three mentioned values were measured again. Data were analyzed by SPSS20 using t-test, paired t-test and ANOVA. Results: Results showed that there were no statistically difference (p value> 0.05) about all dimensions of auto polymerizing acrylic post and core patterns except apical diameter and coronoapical length of Dental Mfg. Co, USA in Deconex®53 plus. Conclusion: The best environment to store Duralay APARPs with minimal changes was water and for disinfection, Deconex®53plus and Unident ® Imprecan showed acceptable properties with both of Duralay types.
- انتشار مقاله: 11-07-1396
- نویسندگان: Abbas Fallahtafti,Mohamad Hossein Lotfikamran,Seyyed Mohammad Abrisham,Reza Fallahtafti,Mojtaba Amini,Mohammad Reza Hakimi Meibodi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Foreign Language Teaching and Translation Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: Acceptability,Adequacy,Shift,Legal Text
- چکیده: تقریباً همیشه ترجمه در یک چارچوب فرهنگی-اجتماعی با ایدئولوژی خاص خود صورت میپذیرد. در مطالعه حاضر، کاربرد انواع مختلف تغییر در دو ترجمه حقوقی بررسی شد تا نشان دهیم که چگونه گرایشهای فرهنگی-اجتماعی و ایدئولوژیکی مترجم بر ترجمه تأثیر میگذارد. دو متن حقوقی به زبان انگلیسی (توافق ژنو و ان پی تی) و ترجمه فارسی آنها که وزارت امور خارجه ایران انجام داده است، به عنوان پیکره مطالعه بررسی شدند. تحلیل ترجمهها، عدم وجود تغییرهای فرهنگی و ایدئولوژیکی و وجود تغییرهای ساختاری و سبکی را در ترجمهها نشان داد. متون حقوقی از حساسیت بالایی برخوردار میباشند، بنابراین، ترجمه آنها به حداکثر دقت نیاز دارد. این مقتضیات، کاربرد تغییرهای فرهنگی و ایدئولوژیکی را در ترجمه حقوقی غیر ممکن میسازد. بنابراین، نتایج مطالعه حاضر، ناظر بر این مطلب است که در تدریس ترجمه حقوقی، میبایست توجه به سوی تغییرهای ساختاری و سبکی مبذول گردد. درمورد بسندگی و پسندیدگی، نتایج نشان داد که ترجمه نمیتواند کاملاً بسنده و یا کاملاً پسندیده باشد؛ قطبهای بسندگی و پسندیدگی به صورت پیوستار میباشند ومترجم بین این دو نقطه در حرکت است.
- چکیده انگلیسی: Translation is almost always conducted within a certain socio-cultural framework with its particular ideology. In the present study, the application of various shift types in two legal translations was examined to show how socio-cultural and ideological inclinations of the translator affect adequacy and acceptability in translation. Two legal texts in English (the Geneva Interim Agreement and NPT) and their Persian translations released by IRI’s Ministry of Foreign Affairs formed the corpus of the study. The analysis of the translations indicated the lack of ideological and cultural shifts and the presence of structural and stylistic shifts. Legal texts are highly sensitive and need the utmost precision in their translation. These requirements could make ideological and cultural shifts out of the question in legal translation. The results, therefore, suggest that in legal translation training, attention should be devoted to structural and stylistic shifts. As for the adequacy and acceptability, it was also observed that translated texts cannot be totally adequate or totally acceptable; the poles of adequacy and acceptability are on a continuum, and translators move between these two extremes.
- انتشار مقاله: 10-08-1398
- نویسندگان: Mojtaba Amini,Bahareh Lotfollahi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanoparticles,Oxidation,Sulfide,Spinel,FeCo2O4
- چکیده:
- چکیده انگلیسی: We report the preparation and characterization of spinel-structured FeCo2O4 nanoparticles for the efficient and selective oxidation of sulfides. The as-prepared FeCo2O4 nanoparticles were characterized by powder X-ray diffraction (PXRD), energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). According to TEM images, the size of the FeCo2O4 particles is identified to be 10– 20 nm. The obtained FeCo2O4 nanoparticles were used as an efficient catalyst for oxidation of sulfides. For all sulfide substrates, very good conversions (69-100%) and selectivities (89-99%) depending on the nature of the sulfide substrates were obtained. The reusability and recoverability of catalyst show that the catalytic system can be reused fourth times without significant loss of reactivity and stability.
- انتشار مقاله: 15-06-1398
- نویسندگان: Mojtaba Amini,Samaneh Aghamohamadi,Sanjeev Gautam,Keun Hwa Chae
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: 3,crystal structure,2,Binuclear palladium(II) complex,1-Methyl-1H-1,4-tetrazole-5-thiol,Mizoroki-Heck reaction
- چکیده:
- چکیده انگلیسی: A new binuclear paddle-wheel palladium(II) complex of [Pd2(μ-mtzt)4]dmgH2 (1) has been prepared by the treatment of PdCl2 in acetonitrile with mixture of 1-methyl-1H-1,2,3,4-tetrazole-5-thiol (Hmtzt) and dimethylglyoxime (dmgH2) in methanol. Resulted complex was characterized by elemental analysis (CHNS), IR, UV–Vis absorption, 1H NMR spectroscopy and its structure was determined with single-crystal X-ray diffraction. Single crystal analysis reveals that this complex has binuclear structure in a paddle-wheel fashion with Pd-Pd distances of 2.808(2)Å. Also, in this binuclear complex, each palladium(II) ion has a slightly distorted square-pyramidal coordination geometry with the two nitrogen and two sulfur atoms in equatorial positions from four bridges mtzt- ligands and the second palladium subunit in axial position. Catalytic potentiality of complex 1 is also exhibited in the Mizoroki–Heck coupling reactions between a range of aryl halides and olefins. The catalyst shows very much efficient reactivity in the Mizoroki–Heck reactions giving high yield of the coupling products.
- انتشار مقاله: 10-06-1398
- نویسندگان: Vahid Amani,Akram Sadat Delbari,Ali Akbari,Mohammad Reza Poor Heravi,Mojtaba Amini
- مشاهده