One-pot synthesis of zinc doped yttrium copper titanate by semi-wet route exhibiting enhanced dielectric constant and suppressed dielectric loss

2017 ◽  
Vol 1 (6) ◽  
pp. 1165-1178 ◽  
Author(s):  
S. Sharma ◽  
M. M. Singh ◽  
K. D. Mandal
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Dielectric Loss ◽  
One Pot ◽  
One Pot Synthesis ◽  
First Time

Powder of Y2/3Cu2.90Zn0.10Ti4O12 (YCZTO) ceramic with particle size ranging from 39 ± 6 nm was grown for the first time by the semi-wet route.

An Expeditious One-Pot Three-Component Synthesis of 4-Aryl-3,4-dihydrobenzo[g] quinoline-2,5,10(1H)-triones under Green Conditions

2020 ◽  
Vol 23 (23) ◽  
pp. 2626-2634
Author(s):  
Saiedeh Kamalifar ◽  
Hamzeh Kiyani
Keyword(s):  
Reaction Medium ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
One Pot ◽  
One Pot Synthesis ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
First Time ◽  
Green Conditions

: An efficient and facial one-pot synthesis of 4-aryl-3,4-dihydrobenzo[g]quinoline- 2,5,10(1H)-triones was developed for the first time. The process proceeded via the three-component cyclocondensation of 2-amino-1,4-naphthoquinone with Meldrum’s acid and substituted benzaldehydes under green conditions. The fused 3,4-dihydropyridin-2(1H)- one-ring naphthoquinones have been synthesized with good to high yields in refluxing ethanol as a green reaction medium. This protocol is simple and effective as well as does not involve the assistance of the catalyst, additive, or hazardous solvents.

Pt NPs@GO as a highly efficient and reusable catalyst for one-pot synthesis of acridinedione derivatives

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49295-49300 ◽  
Author(s):  
Handan Pamuk ◽  
Burak Aday ◽  
Fatih Şen ◽  
Muharrem Kaya
Keyword(s):  
Aromatic Aldehydes ◽  
Reusable Catalyst ◽  
One Pot ◽  
Highly Efficient ◽  
One Pot Synthesis ◽  
First Time

Pt NPs@GO has been used for the first time for synthesizing acridinedione from dimedone, aromatic aldehydes and various amines as a catalyst.

Catalyst-Free One-Pot Synthesis of Novel Heteroarylamine Substituted Furo[3,2-c]coumarins

Synlett ◽  
2018 ◽  
Vol 29 (12) ◽  
pp. 1589-1592 ◽  
Author(s):  
Abolfazl Olyaei ◽  
Mahnaz Saraei ◽  
Reyhaneh Khoeiniha
Keyword(s):  
Michael Addition ◽  
Aldol Condensation ◽  
Ring Closure ◽  
Dehydration Reaction ◽  
One Pot ◽  
Catalyst Free ◽  
One Pot Synthesis ◽  
Tandem Process ◽  
First Time

A high-yielding cyclocondensation of 4-hydroxycoumarin, phenylglyoxal monohydrate, and heteroarylamines proceeds without catalysis, which gives novel functionalized furo[3,2-c]coumarins and heteroarylamino alkylation of coumarin products in acetonitrile under reflux, is reported for the first time. This tandem process involves sequentially an aldol condensation, Michael addition, a ring closure, and dehydration reaction.

scholarly journals Formation of ZnO/Zn0.5Cd0.5Se Alloy Quantum Dots in the Presence of High Oleylamine Contents

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 999
Author(s):  
Yi-An Chen ◽  
Kuo-Hsien Chou ◽  
Yi-Yang Kuo ◽  
Cheng-Ye Wu ◽  
Po-Wen Hsiao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Particle Size ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Alloy Quantum Dots ◽  
First Time

To the best of our knowledge, this report presents, for the first time, the schematic of the possible chemical reaction for a one-pot synthesis of Zn0.5Cd0.5Se alloy quantum dots (QDs) in the presence of low/high oleylamine (OLA) contents. For high OLA contents, high-resolution transmission electron microscopy (HRTEM) results showed that the average size of Zn0.5Cd0.5Se increases significantly from 4 to 9 nm with an increasing OLA content from 4 to 10 mL. First, [Zn(OAc)2]–OLA complex can be formed by a reaction between Zn(OAc)2 and OLA. Then, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) data confirmed that ZnO is formed by thermal decomposition of the [Zn(OAc)2]–OLA complex. The results indicated that ZnO grew on the Zn0.5Cd0.5Se surface, thus increasing the particle size. For low OLA contents, HRTEM images were used to estimate the average sizes of the Zn0.5Cd0.5Se alloy QDs, which were approximately 8, 6, and 4 nm with OLA loadings of 0, 2, and 4 mL, respectively. We found that Zn(OAc)2 and OLA could form a [Zn(OAc)2]–OLA complex, which inhibited the growth of the Zn0.5Cd0.5Se alloy QDs, due to the decreasing reaction between Zn(oleic acid)2 and Se2−, which led to a decrease in particle size.

Enhanced dielectric properties of conductive-dielectric composites by reducing particle size and core@shell method

2018 ◽  
Vol 11 (01) ◽  
pp. 1850010 ◽  
Author(s):  
Yuqiang Guo ◽  
Yifei Wang ◽  
Yaxuan Ren ◽  
Mingzhu Fu ◽  
Hongmei Ma ◽  
...  
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Mass Fraction ◽  
Core Shell ◽  
Particle Sizes ◽  
Conductive Particle ◽  
Threshold Theory ◽  
Conductive Polyaniline

Based on the percolation threshold theory of conductive-dielectric composites, the dielectric constant can be improved more by adding a certain mass fraction of conductive particle into polymer matrix. However, the dielectric loss increases with the increasing mass fraction of conductive particle. In this paper, conductive Polyaniline (PANI) with different particle sizes is utilized to illustrate that reducing particle size can improve the dielectric properties. The dielectric constant is increased from 319 to 540, and dielectric loss is decreased from 2.34 to 0.85 when PANI with smaller particle size is used. Moreover, PANI coated with an insulating surfactant layer can further improve the dielectric properties, the experimental results show that the dielectric constant of the composite could be more than 1000, while the dielectric loss is 0.35 at 1[Formula: see text]KHz.

One-Pot Synthesis of Thiazolo[3,4-a]Quinoxalines from 1,2-Diamines, Aryl Isothiocyanates and Ethyl Bromopyruvate

2017 ◽  
Vol 41 (12) ◽  
pp. 712-714 ◽  
Author(s):  
Mohammad Piltan
Keyword(s):  
Chromatographic Separations ◽  
One Pot ◽  
One Pot Synthesis ◽  
Three Component Reaction ◽  
Wide Range ◽  
Quinoxaline Derivatives ◽  
First Time ◽  
Aryl Isothiocyanates ◽  
Ethyl Bromopyruvate

Some hitherto unreported thiazolo[3,4- a]quinoxaline derivatives have been synthesised in excellent yields via a one-pot, three-component reaction of benzene-1,2-diamines, ethyl bromopyruvate and aryl isothiocyanates in MeCN, for the first time. The protocol avoids the use of any catalysts or chromatographic separations and provides a wide range of novel thiazolo[3,4- a]quinoxalines.

One-pot atom-efficient synthesis of bio-renewable polyesters and cyclic carbonates through tandem catalysis

2015 ◽  
Vol 51 (40) ◽  
pp. 8504-8507 ◽  
Author(s):  
Fan Jia ◽  
Xiaoyu Chen ◽  
Yan Zheng ◽  
Yusheng Qin ◽  
Youhua Tao ◽  
...  
Keyword(s):  
Tandem Reaction ◽  
Cyclic Carbonates ◽  
Tandem Catalysis ◽  
Efficient Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Salen Complexes ◽  
High Yields ◽  
First Time

One-pot synthesis of well-defined bio-renewable polyesters and cyclic carbonates in high yields was successfully realized for the first time by way of a tandem reaction using metal salen complexes as catalysts.

Unidirectional growth ofL-cysteine hydrochloride monohydrate: first time observation as nonlinear optical material and its characterization

2010 ◽  
Vol 43 (4) ◽  
pp. 710-715 ◽  
Author(s):  
G. Bhagavannarayana ◽  
Suman Kumar ◽  
Mohd Shakir ◽  
S. K. Kushawaha ◽  
K. K. Maurya ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Single Crystal ◽  
Nonlinear Optical ◽  
Grown Crystal ◽  
Optical Material ◽  
Nonlinear Optical Material ◽  
X Ray ◽  
Cysteine Hydrochloride ◽  
First Time

A bulk size (∼60 mm length and 20 mm diameter) single crystal of L-cysteine hydrochloride monohydrate has been successfully grown for the first time by the unidirectional Sankaranarayanan–Ramasamy method and found to be a nonlinear optical material by observing the second harmonic generation (SHG). The crystal structure has been confirmed by single-crystal as well as powder X-ray diffraction analysis. The Fourier transform–Raman technique was used to study the vibrational modes and functional groups. The grown crystal was found to be highly transparent. The crystalline perfection has been evaluated by high-resolution X-ray diffractometry and the grown crystal was found to be free from macroscopic defects such as structural grain boundaries. The relative SHG efficiency and laser damage threshold values were found to be 1.2 and 5.5 times that of a potassium dihydrogen phosphate crystal, respectively. The dielectric constant, dielectric loss and alternating current conductivity were measured by an impedance analyser over a wide range of frequency between 100 Hz and 5 MHz. The dielectric constant was found to be stable for the entire range of frequency with very small dielectric loss, making this material suitable for device applications. The present investigation reveals that the title compound, since it can be grown with desirable size along a predetermined direction and it is a good nonlinear optical material with the prerequisite optical and dielectric properties, is a good candidate for photonic or opto-electronic applications.

One-Pot Syntheses of Diaryliodonium Salts from Aryl Iodides Using Peracetic Acid as Green Oxidant

2011 ◽  
Vol 64 (5) ◽  
pp. 529 ◽  
Author(s):  
Toshifumi Dohi ◽  
Nobutaka Yamaoka ◽  
Itsuki Itani ◽  
Yasuyuki Kita
Keyword(s):  
Peracetic Acid ◽  
Hypervalent Iodine ◽  
One Pot ◽  
Iodine Species ◽  
One Pot Synthesis ◽  
Diaryliodonium Salts ◽  
Aryl Iodides ◽  
First Time

The rate-accelerating effects of fluoroalcohol solvents for generating trivalent hypervalent iodine species and the conversion into diaryliodonium(iii) salts have been used for the first time to realize a facile and clean one-pot synthesis of diaryliodonium(iii) salts 3 from aryl iodides 1 and suitable arene partners 2 with peracetic acid (PAA). The use of PAA as a green and practical oxidant is significantly effective in fluoroalcohol solvents. The scope and limitations of the methodology are elucidated by investigation of a wide variety of representative substrates.

scholarly journals One-pot synthesis of polyaniline/Fe3O4 nanocomposite in ionicliquid: electrical conductivity and magnetic studies

2019 ◽  
Vol 118 ◽  
pp. 01059
Author(s):  
Xiaoyang Li ◽  
Genwang Zhang ◽  
Binwei Wang ◽  
Tan Lin ◽  
Guo Wang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Imidazolium Chloride ◽  
One Pot ◽  
One Pot Synthesis ◽  
Transmission Electron ◽  
First Time

One-pot synthesis of polyaniline/Fe3O4 nanocomposite in 1-methyl-3-alkylcarboxylic acid imidazolium chloride ([CMMIm]Cl) ionic liquid (IL) was introduced for the first time in this work. Transmission electron microscopy (TEM), X-ray diffraction (XRD), four probes method and vibrating sample magnetometer (VSM) were used to explore the influence of IL on the structure, conductivity and magnetic properties of polyaniline/Fe3O4 composite. Compared with Fe3O4 particles prepared in water, the results show that Fe3O4 particles prepare in imidazolium-based ionic liquid were more regular in shape and dispersed uniformly. So the Fe3O4 nanoparticles prepared in IL can easier serve as cores to form the polyaniline/Fe3O4 nanocomposite via in situ chemical oxidative polymerization of aniline molecule. The saturation magnetization of polyaniline/Fe3O4 nanocomposite prepared in ionic liquid shows about 2 times higher than polyaniline/Fe3O4 composite prepared in water. And the conductivities of PANI/Fe3O4 composite prepared in IL decreased and the saturated magnetization increased with the increasing amount of Fe3O4.

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