scholarly journals Green Solvents as an Alternative to DMF in ZIF-90 Synthesis

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1573
Author(s):  
Aljaž Škrjanc ◽  
Ciara Byrne ◽  
Nataša Zabukovec Logar
Keyword(s):  
Room Temperature ◽  
Product Yield ◽  
Solvent Exchange ◽  
Green Solvents ◽  
Zeolitic Imidazolate Framework ◽  
Short Treatment ◽  
Molar Ratios ◽  
Primary Particles ◽  
High Product Yield

The use of green solvents as an alternative to dimethylformamide (DMF) in the synthesis of zeolitic imidazolate framework-90 (ZIF-90) was investigated. Two biobased aprotic dipolar solvents CyreneTM and γ-valerolactone (GVL) proved to successfully replace DMF in the synthesis at room temperature with a high product yield. While the CyreneTM—based product shows reduced porosity after activation, the use of GVL resulted in materials with preserved crystallinity and porosity after activation, without prior solvent exchange and a short treatment at 200 °C. The primary particles of 30 nm to 60 nm in all products further form agglomerates of different size and interparticle mesoporosity, depending on the type and molar ratios of solvents used.

scholarly journals Catalyst-Free Cascade Synthesis of Densely Functionalized Chromenes in Water

2019 ◽  
Vol 31 (11) ◽  
pp. 2532-2536
Author(s):  
Subrahmanya Ishwar Bhat
Keyword(s):  
Intramolecular Cyclization ◽  
Room Temperature ◽  
Product Yield ◽  
Catalyst Free ◽  
Environmental Friendly ◽  
Simple Filtration ◽  
High Product Yield ◽  
Filtration Technique

An expeditious and environmental friendly, general protocol has been developed for the synthesis of 2-amino-3-cyano-4H-chromenes via cascade Knoevenagel-Michael-intramolecular cyclization in water. Pure solid products were obtained by simple filtration technique. The aqueous catalyst-free reactions lead to high product yield at room temperature.

Transformation of Bromhexine, a Mucolytic Drug into Potential Pharmacologically Important Urea Derivatives

2020 ◽  
Vol 42 (5) ◽  
pp. 776-776
Author(s):  
Muhammad Sharif Muhammad Sharif
Keyword(s):  
Room Temperature ◽  
Product Yield ◽  
General Interest ◽  
Urea Derivatives ◽  
High Product Yield ◽  
Derivatives Of ◽  
General Synthesis ◽  
Mucolytic Agent

A general synthesis for 1,3-diphenylurea and 1,3-diphenylthiourea derivatives of mucolytic agent bromhexine is described by reactions of different commercially available phenyl isocyanates and phenyl-isothiocyanates at room temperature without any additional catalyst and additive. Using commercially available electron donating and electron withdrawing phenyl isocyanates in the transformation of bromhexine into urea derivatives proceeded from moderate to high product yield (42-90%). Bromhexine resulting compounds add a general interest in the fields of Pharmaceuticals, diagnostics and materials.

Tetraamminecopper(II) Sulfate Monohydrate in Oxidative Azide-olefin Cyclo-addition and Three-component Click Reaction

2020 ◽  
Vol 17 (1) ◽  
pp. 65-72
Author(s):  
Jasmin Sultana ◽  
Diganta Sarma
Keyword(s):  
Boronic Acid ◽  
Room Temperature ◽  
Click Reaction ◽  
Product Yield ◽  
Process Time ◽  
One Pot ◽  
Synthetic Process ◽  
Cu Complex ◽  
Aqueous Solvent ◽  
High Product Yield

Introduction: An effective Cu-complex, [Cu(NH3)4SO4 • H2O] was prepared conveniently from the inexpensive and easily available starting reagents in a simple route. Materials and Methods: Excellent reactivity of the catalyst was observed towards two competent clickcycloadditions: (a) oxidative cycloaddition of azides with electron-poor olefins and (b) one-pot cycloaddition of alkynes with boronic acid and sodium azide under “click-appropriate” conditions. Results: No external oxidant, short reaction time, high product yield, wide substrate scope, and aqueous solvent media make the azide-olefin cycloaddition approach a greener route in contrast to the reported methods. Conclusion: The newly developed mild, green, and rapid three-component strategy shows product diversity with superb yields at room temperature by reducing the synthetic process time and using only 1 mol % of the synthesized copper complex.

scholarly journals Evaluation of Structural Properties and Catalytic Activities in Knoevenagel Condensation Reaction of Zeolitic Imidazolate Framework-8 Synthesized under Different Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Pham Dinh Du ◽  
Nguyen Viet Duy Thanh ◽  
Nguyen Trung Hieu
Keyword(s):  
Reaction Time ◽  
Structural Properties ◽  
High Temperatures ◽  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Zeolitic Imidazolate Framework ◽  
Catalytic Activities ◽  
Molar Ratios ◽  
Knoevenagel Condensation Reaction

In the present study, the zeolitic imidazolate framework-8 (ZIF-8) was synthesized at both room temperature and high temperatures. The effects of solvents, molar ratios of precursors, reaction time, and temperature on the structural properties of the as-prepared materials were investigated. Moreover, the surface morphologies of the obtained specimens were characterized using X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and nitrogen adsorption methods. The results show that ZIF-8 was formed in methanol and water at room temperature and in dimethylformamide (DMF) at high temperatures. Further, in methanol, the molar ratios of precursors and reaction time have negligible effects on the morphologies and structures of ZIF-8; however, in DMF, the reaction temperature has a significant influence on the microstructures of ZIF-8. The catalytic activities of the obtained materials were evaluated using the Knoevenagel condensation reaction, and ZIF-8 proves to be an excellent solid base catalyst.

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

scholarly journals Synthesis and characterization of a new ZIF-67@MgAl2O4 nanocomposite and its adsorption behaviour

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13245-13255
Author(s):  
Mehdi Davoodi ◽  
Fatemeh Davar ◽  
Mohammad R. Rezayat ◽  
Mohammad T. Jafari ◽  
Mehdi Bazarganipour ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnesium Aluminate ◽  
Synthesis And Characterization ◽  
Magnesium Aluminate Spinel ◽  
Adsorption Behaviour ◽  
Zeolitic Imidazolate Framework ◽  
Simple Method

New nanocomposite of zeolitic imidazolate framework-67@magnesium aluminate spinel (ZIF-67@MgAl2O4) has been fabricated by a simple method at room temperature with different weight ratios.

scholarly journals A green approach to the synthesis of a nano catalyst and the role of basicity, calcination, catalytic activity and aging in the green synthesis of 2-aryl bezimidazoles, benzothiazoles and benzoxazoles

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42000-42012 ◽  
Author(s):  
Pramod K. Sahu
Keyword(s):  
Catalytic Activity ◽  
Green Synthesis ◽  
Room Temperature ◽  
Molar Ratios ◽  
Green Approach ◽  
Grinding Method ◽  
Nano Catalyst ◽  
Layered Catalyst

A green synthesis of hydrotalcite (a double layered catalyst) by a grinding method using Al/Mg molar ratios of 1.0–3.0 at room temperature is described.

Preparation of Ag@zeolitic imidazolate framework-67 at room temperature for electrochemical sensing of hydrogen peroxide

The Analyst ◽  
2019 ◽  
Vol 144 (2) ◽  
pp. 521-529 ◽  
Author(s):  
Yuhua Dong ◽  
Chengqian Duan ◽  
Qinglin Sheng ◽  
Jianbin Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Room Temperature ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Zeolitic Imidazolate Framework ◽  
Simple Method ◽  
Hydrogen Peroxide Sensor

In this work, a novel non-enzymatic hydrogen peroxide sensor, Ag@zeolitic imidazolate framework-67 (Ag@ZIF-67)/glassy carbon electrode (GCE), was fabricated by a simple method at room temperature.

Thermogravimetric study of the desorption of cyclohexylamine and pyridine from an acid-treated Wyoming bentonite

Clay Minerals ◽  
1991 ◽  
Vol 26 (4) ◽  
pp. 473-486 ◽  
Author(s):  
C. Breen
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Product Yield ◽  
Efficient Catalyst ◽  
X Ray ◽  
Product Yields ◽  
Thermogravimetric Study ◽  
Wyoming Bentonite

AbstractFour 15 g samples of an unsedimented Wyoming bentonite were treated with 200 cm3 of 0·025, 0·050, 0·100 and 0·250 mol dm−3 H2SO4 for 1 h at room temperature (samples I–IV, respectively). Three further 15 g samples were treated with 200 cm3 of 50% (v/v) H2SO4 for 1 h at 20°C (sample V), and 1 and 2 h under reflux (samples VI and VII, respectively). X-ray fluorescence and diffraction studies revealed that only samples VI and VII suffered any substantial structural attack. The resulting acidity of the clays, determined by cyclohexylamine desorption, indicated that sample V contained the largest number of protons at 0·59 mmol H+ (g clay)−1. Sample V was also the most efficient catalyst for the dehydration and etherification of hexan-1-ol, giving a combined product yield of 17·0% after 2 h reflux in neat reactant. The parent bentonite and samples I and II showed no discernible catalytic activity despite measured acidities of 0·1, 0·24 and 0·34 mmol H+ (g clay)−1. In contrast samples III and IV gave combined product yields of 4·5 and 11·0%, respectively, which correlated well with the measured acidities of 0·38 and 0·48 mmol H+ (g clay)−1. Samples VI and VII, prepared by reflux in acid, contained 0·3 and 0·1 mmol H+ (g clay)−1, respectively, and gave combined product yields of 13·0 and 6·0%.

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