scholarly journals Synthesis and characterization of a hydrophobic silica aerogel using SEM, TEM, FTIR, NMR spectroscopy and HP 129Xe

2020 ◽  
Author(s):  
Juan Diego Barboza Carmona ◽  
Isaac F. Céspedes-Camacho
Keyword(s):  
Nmr Spectroscopy ◽  
Silica Aerogel ◽  
Synthesis And Characterization ◽  
Hydrophobic Silica

scholarly journals Synthesis and Characterization of Hydrophobic Silica Thin Layer Derived from Methyltrimethoxysilane (MTMS)

2018 ◽  
Vol 299 ◽  
pp. 012041 ◽  
Author(s):  
Adi Darmawan ◽  
Riyadini Utari ◽  
Riza Eka Saputra ◽  
Suhartana ◽  
Yayuk Astuti
Keyword(s):  
Thin Layer ◽  
Synthesis And Characterization ◽  
Hydrophobic Silica

Synthesis and characterization of polycarbodiimides by MALDI-TOF MS and NMR spectroscopy: kinetic and mechanism study

2017 ◽  
Vol 75 (6) ◽  
pp. 2657-2670
Author(s):  
Albert Morell Garcia ◽  
Francisco Medina Cabello ◽  
Antonio Torrelles Nogués
Keyword(s):  
Nmr Spectroscopy ◽  
Synthesis And Characterization ◽  
Mechanism Study ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Tof Ms

scholarly journals Synthesis and characterization of new Oxazine , Thiazine and Pyrazol derived from chalcones

2014 ◽  
Vol 11 (2) ◽  
pp. 477-485 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Nmr Spectroscopy ◽  
Hydrazine Hydrate ◽  
Elemental Analysis ◽  
Potassium Hydroxide ◽  
1H Nmr Spectroscopy ◽  
Room Temperature ◽  
Potassium Hydroxide Solution ◽  
Synthesis And Characterization ◽  
Heterocyclic Derivatives

In this study, chalcones were synthesis by condensing 2-acetylpyridine with aromatic aldehyde derivatives in dilute ethanolic potassium hydroxide solution at room temperature according to Claisen-Schmidt condensation. After that, new heterocyclic derivatives such as Oxazine, Thiazine and Pyrazol were synthesis by reaction between chalcones with urea, thiourea and hydrazine hydrate respectively scheme 1. All these compounds wrer characterization by FTIR, 1H-NMR spectroscopy and elemental analysis.

scholarly journals Synthesis and Characterization of Super Bulky β-Diketiminato Group 1 Metal Complexes

Inorganics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 72
Author(s):  
Dafydd D. L. Jones ◽  
Samuel Watts ◽  
Cameron Jones
Keyword(s):  
Nmr Spectroscopy ◽  
Alkali Metal ◽  
Metal Complexes ◽  
Oxidation State ◽  
Synthesis And Characterization ◽  
X Ray Crystallography ◽  
Low Oxidation State ◽  
Bulky Ligand ◽  
Group 1

Sterically bulky β-diketiminate (or Nacnac) ligand systems have recently shown the ability to kinetically stabilize highly reactive low-oxidation state main group complexes. Metal halide precursors to such systems can be formed via salt metathesis reactions involving alkali metal complexes of these large ligand frameworks. Herein, we report the synthesis and characterization of lithium and potassium complexes of the super bulky anionic β-diketiminate ligands, known [TCHPNacnac]− and new [TCHP/DipNacnac]− (ArNacnac = [(ArNCMe)2CH]−) (Ar = 2,4,6-tricyclohexylphenyl (TCHP) or 2,6-diisopropylphenyl (Dip)). The reaction of the proteo-ligands, ArNacnacH, with nBuLi give the lithium etherate compounds, [(TCHPNacnac)Li(OEt2)] and [(TCHP/DipNacnac)Li(OEt2)], which were isolated and characterized by multinuclear NMR spectroscopy and X-ray crystallography. The unsolvated potassium salts, [{K(TCHPNacnac)}2] and [{K(TCHP/DipNacnac)}∞], were also synthesized and characterized in solution by NMR spectroscopy. In the solid state, these highly reactive potassium complexes exhibit differing alkali metal coordination modes, depending on the ligand involved. These group 1 complexes have potential as reagents for the transfer of the bulky ligand fragments to metal halides, and for the subsequent stabilization of low-oxidation state metal complexes.

scholarly journals Synthesis and Characterization of Silica Aerogel from Rice Husk with Ambient Pressure Drying Method

2020 ◽  
Vol 1535 ◽  
pp. 012049
Author(s):  
Nor Fadilah Mohamad ◽  
Noor Hidayu Abdul Rani ◽  
Omar Syah Jehan Elham ◽  
Siti Hajar Anaziah Muhamad ◽  
Siti Afifah Muda ◽  
...  
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Drying Method

Synthesis and Characterization of Three Novel Nitrogen-containing Macrolides

2011 ◽  
Vol 66 (9) ◽  
pp. 930-934
Author(s):  
Xin Leng ◽  
Bingqin Yang ◽  
Yuanyuan Liu ◽  
Yi Xie ◽  
Jie Tong
Keyword(s):  
Nmr Spectroscopy ◽  
Hydrogen Bonds ◽  
1H Nmr Spectroscopy ◽  
Mass Spectra ◽  
Synthesis And Characterization ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
Preparation Methods ◽  
X Ray

Three novel nitrogen-containing macrolides have been synthesized by esterification. All of them have been characterized by infrared (IR), elemental analysis, mass spectra (MS), and 1H NMR spectroscopy, and their crystal structures were determined by single-crystal X-ray diffraction. The preparation methods and the intermolecular associations based on C-H・・・O hydrogen bonds and π- π stacking interactions are discussed.

Probing Individual Steps of Dynamic Exchange with31P EXSY NMR Spectroscopy:  Synthesis and Characterization of the [E7PtH(PPh3)]2-Zintl Ion Complexes [E = P, As]

2000 ◽  
Vol 122 (45) ◽  
pp. 11101-11107 ◽  
Author(s):  
Banu Kesanli ◽  
Scott Charles ◽  
Yiu-Fai Lam ◽  
Simon G. Bott ◽  
James Fettinger ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Synthesis And Characterization ◽  
Dynamic Exchange ◽  
Zintl Ion
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