earth cation

نتایج جستجو برای: earth cation

تعداد نتایج: 148521 فیلتر نتایج به سال:

complexation of calcium and barium cations by calix[4]arene-bis-crown-6

Journal: :journal of physical & theoretical chemistry 2005

poupak khazaeli-parsa mehran aghaie karim zare azar bouzaripour

in this study the binding abilities of 1,3-calix[4]biscrown-6 (l) toward ba2+ and ca2+ have beenestablished in methanol by spectrophotometric measurements at 25±0.1 °c and 0.01 m ionicstrength, and with using specfit computer program; stability constants for 2 : 1, metal : ligandcomplexes has been estimated

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Cation diffusion in alkaline-earth oxides

Journal: :Journal of Physics C: Solid State Physics 1987

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comparison of catalytic effect of alkali and alkaline earth metals hydrogen sulfate: as the promoter for an efficient synthesis of 3,4-dihydropyrimidin-2(1h)-ones under solvent-free conditions

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2005

ahmad shaabani ayoob bazgir sakineh arab ameri masoumeh sharifi kiasaraie sima samadi

alkali and alkaline earth metals hydrogen sulfate catalyzed the one-pot three component condensation reactions of aldehydes, 1,3-dicarbonyl compounds and urea or thiourea under solvent-free conditions leading to 3,4-dihydropyrimidin-2(1h)-ones in high yields at 80 °c. our results showed that biginelli reaction not only is ph dependent, but the cation of catalyst plays an important role.

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study of ionic solvation and determination of solvation numbers of alkaline earth cations with hmpa in nitromethane using 1h nmr technique

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2001

nina alizadeh mohammad k. amini

a proton nmr method for the drtermination of salvation numbers of alkaline earth cations with hexamethyl phosphoramide (hmpa) in nitromethane (nm) as diluents is described. the method is based on monitoring the resonance frequency of hmpa protons as a function of hmpa / metal ion molar ratio at constant metalion concentration. the average salvation number of cations, , at any hmpa / metal ion ...

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Study of Ionic Solvation and Determination of Solvation Numbers of Alkaline Earth Cations with HMPA in Nitromethane Using 1H NMR Technique

Journal: Iranian Journal of Chemistry and Chemical Engineering 2001

Mohammad K. Amini Nina Alizadeh

A proton NMR method for the drtermination of salvation numbers of alkaline earth cations with hexamethyl phosphoramide (HMPA) in nitromethane (NM) as diluents is described. The method is based on monitoring the resonance frequency of HMPA protons as a function of HMPA / metal ion molar ratio at constant metalion concentration. The average salvation number of cations, , at any HMPA / metal ...

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مطالعه واکنشهای تشکیل کمپلکس بین بعضی از کاتیونهای قلیایی و خاکهای کمیاب ‏‎(k+, na+, ce3+, la3+)‎‏ با کرون اترها در مخلوط حلالهای آلی به روش هدایت سنجی

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور 1388

فاطمه ایمانی نژاد, خلیل اله طاهری, زرین اسحاقی,

چکیده ندارد.

15 صفحه اول

CATION COLLOIDAL PARTICLES IN ALKALINE-EARTH HALIDES

Journal: :Le Journal de Physique Colloques 1976

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Comparison of Catalytic Effect of Alkali and Alkaline Earth Metals Hydrogen Sulfate: As the Promoter for an Efficient Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones under Solvent-Free Conditions

Journal: Iranian Journal of Chemistry and Chemical Engineering 2005

Ahmad Shaabani, Ayoob Bazgir Masoumeh Sharifi Kiasaraie Sakineh Arab Ameri Sima Samadi

Alkali and alkaline earth metals hydrogen sulfate catalyzed the one-pot three component condensation reactions of aldehydes, 1,3-dicarbonyl compounds and urea or thiourea under solvent-free conditions leading to 3,4-dihydropyrimidin-2(1H)-ones in high yields at 80 °C. Our results showed that Biginelli reaction not only is pH dependent, but the cation of catalyst plays an importan...

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Cation Substitution in Earth-Abundant Kesterite Photovoltaic Materials

Journal: :Advanced Science 2018

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بررسی محاسبات کوانتومی اثر هورمون رشد در چرخه بیوسنتزی تولید اسانس در گیاهان

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1391

نسیم اعتماد, نادر زبرجدشیراز, علیرضا فیض بخش,

رشد و گسترش بسیاری از گیاهان به واسطه فعالیت هورمون های گیاهی تنظیم می شود. نتایج تجربی نشان دادند که هورمون تراپی با هورمون ga3 تاثیر معناداری بر روی توزیع مونوترپن ها در گیاهrubus caesius دارد. در حضور هورمون ga3 غلظتcineole و ? –cadinene کاهش و میزان ? –terpinoleneand longifoleneافزایش یافت. با بررسی مسیر بیوسنتزی مشخص شد که ? –terpinolene و cineoleاز حدواسط ? –terpinyl cation مشتق شده اند و...

15 صفحه اول

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