Substituent Influence on Structural and Luminescent Diversities of Cu3(pyrazolate)3-CunIn Coordination Supramolecular Isomers

2018 ◽  
Vol 18 (12) ◽  
pp. 7663-7673 ◽  
Author(s):  
Shun-Ze Zhan ◽  
Tong Feng ◽  
Weigang Lu ◽  
Mohd. R. Razali ◽  
Dan Li
Keyword(s):  
Substituent Influence

scholarly journals The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2623
Author(s):  
Monika Wójcik-Bania ◽  
Jakub Matusik
Keyword(s):  
Total Pore Volume ◽  
Cross Linking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
The Cross ◽  
Chain Lengths ◽  
First Time ◽  
Substituent Influence ◽  
Benzyl Substituent

Polymer–clay mineral composites are an important class of materials with various applications in the industry. Despite interesting properties of polysiloxanes, such matrices were rarely used in combination with clay minerals. Thus, for the first time, a systematic study was designed to investigate the cross-linking efficiency of polysiloxane networks in the presence of 2 wt % of organo-montmorillonite. Montmorillonite (Mt) was intercalated with six quaternary ammonium salts of the cation structure [(CH3)2R’NR]+, where R = C12, C14, C16, and R’ = methyl or benzyl substituent. The intercalation efficiency was examined by X-ray diffraction, CHN elemental analysis, and Fourier transform infrared (FTIR) spectroscopy. Textural studies have shown that the application of freezing in liquid nitrogen and freeze-drying after the intercalation increases the specific surface area and the total pore volume of organo-Mt. The polymer matrix was a poly(methylhydrosiloxane) cross-linked with two linear vinylsiloxanes of different siloxane chain lengths between end functional groups. X-ray diffraction and transmission electron microscopy studies have shown that the increase in d-spacing of organo-Mt and the benzyl substituent influence the degree of nanofillers’ exfoliation in the nanocomposites. The increase in the degree of organo-Mt exfoliation reduces the efficiency of hydrosilylation reaction monitored by FTIR. This was due to physical hindrance induced by exfoliated Mt particles.

Aminimides. II. A one-step synthesis of aminimides from carboxylic acid esters

1967 ◽  
Vol 45 (21) ◽  
pp. 2619-2623 ◽  
Author(s):  
William J. McKillip ◽  
Robert C. Slagel
Keyword(s):  
Carboxylic Acid ◽  
Reaction Temperature ◽  
Sodium Methoxide ◽  
General Applicability ◽  
Acyl Substituent ◽  
One Step ◽  
The One ◽  
Substituent Influence ◽  
Acid Esters

The general applicability of preparing aminimides from esters and insitu generated 1,1,1-trimethylaminimine is reported. Acyclic, alicyclic, aromatic, and heteroaromatic trimethylaminimides have been synthesized by the one-step reaction. The synthetic scheme consists of reacting an ester with a 1,1,1-trimethylhydrazinium salt in the presence of an anhydrous base such as sodium methoxide. The choice of solvent, reaction temperature, and base and the electronegativity of the acyl substituent influence the ease of aminimide formation.

scholarly journals Phosphinodithioformates. IV. Substituent Influence on the Course of the Reaction of Secondary Phosphines with Carbon Disulfide and Base.

1971 ◽  
Vol 25 ◽  
pp. 3163-3171 ◽  
Author(s):  
Otto Dahl ◽  
Olof Wennerström ◽  
R. Stølevik ◽  
Sigfrid Svensson ◽  
J. Koskikallio ◽  
...  
Keyword(s):  
Carbon Disulfide ◽  
Substituent Influence ◽  
Secondary Phosphines

scholarly journals 1-Naphthols as components for multifunctional material systems (MFMS): the molecular modeling approach

2020 ◽  
Vol 32 (1) ◽  
pp. 259-273
Author(s):  
Ilona Radkowska ◽  
Piotr Bragiel
Keyword(s):  
Polarizability Tensor ◽  
Urea Molecule ◽  
Multifunctional Material ◽  
Material Systems ◽  
Alpha Beta ◽  
Electron Withdrawing Group ◽  
The Stability ◽  
Complex Organic ◽  
Derivatives Of ◽  
Substituent Influence

AbstractIncreasing research interests have been paid to developing efficient multifunctional material systems (MFMS) by using various composite materials, owing to their useful properties and good stability. Here, we systematically studied 1-naphthols, especially how the type and position of a substituent influence the reactivity and properties, using different electron-directing groups. During computations, important preparation guidelines for thiol derivatives of 1-naphthol were obtained. It is very interesting to note that some molecules could exhibit intramolecular O–H–O interactions. Careful theoretical investigation reveals that all the tested compounds are stable and the molecules with substituents in positions 4 and 8 are the least reactive. It is also worth noting that for the stability and polarizability tensor values, it is more favorable when both substituents are in the same benzene ring. Among tested 1-naphthols, the greatest values of alpha, beta, and gamma are more than 5, 60, and 110 times better respectively, than in the urea molecule; the change of electron-withdrawing group (EWG) to electron-donating group (EDG) increases NLO effects. This study provided a new scope of 1-naphthols applicability by using them as anti-corrosion materials and as very good materials for NLO devices due to the high stability of the aromatic structure coupled with polarity given by the substituents. Also, the understanding of IR vibrations for more complex organic compounds with thiol substituent has been improved.

Synthesis of 1H-1,3-benzazaphospholes: substituent influence and mechanistical aspects

Tetrahedron ◽  
2001 ◽  
Vol 57 (50) ◽  
pp. 9963-9972 ◽  
Author(s):  
Joachim Heinicke ◽  
Nidhi Gupta ◽  
Anushka Surana ◽  
Normen Peulecke ◽  
Brigitte Witt ◽  
...  
Keyword(s):  
Substituent Influence

Transfer of substituent influence into the remote aromatic ring in 4′-R-dibenzo-crown ethers

1990 ◽  
Vol 28 (2) ◽  
pp. 176-178 ◽  
Author(s):  
V. F. Loktev ◽  
I. L. Mudrakovsky ◽  
A. K. Tashmukhamedova ◽  
I. A. Stempnevskaya ◽  
I. J. Morozova
Keyword(s):  
Aromatic Ring ◽  
Crown Ethers ◽  
Substituent Influence
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