Effect of substituents on the spectroscopic characteristics of carbonyl and amino groups in the IR spectra of carboxylic acid hydrazides

1973 ◽  
Vol 7 (2) ◽  
pp. 176-180
Author(s):  
E. V. Titov ◽  
V. I. Rybachenko
Keyword(s):  
Carboxylic Acid ◽  
Ir Spectra ◽  
Amino Groups ◽  
Effect Of Substituents ◽  
Spectroscopic Characteristics

scholarly journals FT-IR spectroscopic characteristics of differently cultivated Escherichia coli

2009 ◽  
Vol 26 (No. 6) ◽  
pp. 458-463 ◽  
Author(s):  
Z. Filip ◽  
S. Hermann ◽  
K. Demnerová
Keyword(s):  
Escherichia Coli ◽  
Ir Spectra ◽  
Cell Mass ◽  
Bacterial Cells ◽  
Cultural Conditions ◽  
Spectroscopic Characteristics ◽  
Nitrogen Concentrations ◽  
Ft Ir ◽  
Well Differentiated ◽  
Ir Spectroscopic

FT-IR spectra were recorded of <i>Escherichia coli</i> cell mass with the aim of obtaining spectral traits possibly useful in a rapid detection and characterisation of this indicator bacterium. A well differentiated spectrum was obtained from the cell mass harvested in a stationary phase of growth, e.g., after 24 h, from a minimum nutrient broth. The cell mass, harvested either earlier or grown in nutrient solutions which contained an enhanced carbon or nitrogen concentrations delivered somewhat different IR spectra, apparently due to a higher content of nucleic acid components as related to other structural constituents of bacterial cells. Consequently, the FT-IR spectra of <i>E. coli</i>, although rather rapidly to collect, seem only capable of delivering useful and reproducible information if the cell mass is obtained under standardised cultural conditions.

Patterning of Single-Walled Carbon Nanotubes Using Wet Chemical Self-Assembling and Photolithographic Technique

2005 ◽  
Vol 901 ◽  
Author(s):  
Myung-Sup Jung ◽  
Sung-Ouk Jung ◽  
Hee-Tae Jung ◽  
Do Yun Kim ◽  
Seok Gwang Doo
Keyword(s):  
Carbon Nanotubes ◽  
Carboxylic Acid ◽  
High Surface ◽  
Single Walled Carbon Nanotubes ◽  
High Density ◽  
Amino Groups ◽  
Patterned Substrate ◽  
Single Walled Carbon ◽  
Carboxylic Acid Groups ◽  
Walled Carbon Nanotubes

AbstractSingle-walled carbon nanotubes (SWNTs) have been chemically attached with high density onto a patterned substrate. To form the SWNT pattern, the substrate was treated with acid-labile group protected amine, and an amine prepattern was formed using a photolithographic process with a polymeric photo acid generator. The SWNT monolayer pattern was then formed through the amidation reaction between the carboxylic acid groups of carboxylated SWNTs (ca-SWNTs) and the prepatterned amino groups. A high-density multilayer was fabricated via further repeated reaction between the carboxylic acid groups of the ca-SWNTs and the amino groups of the linker with the aid of a condensation agent. Scanning electron microscopy results show that the patterned SWNT films have uniform coverage with high surface density.

scholarly journals Pitfalls in the use of carboxylic acid anhydrides for structural studies of nucleoprotein particles

1987 ◽  
Vol 241 (2) ◽  
pp. 621-623 ◽  
Author(s):  
M A Nieto ◽  
E Palacián
Keyword(s):  
Carboxylic Acid ◽  
Acetic Anhydride ◽  
Structural Studies ◽  
Amino Groups ◽  
Single Stranded Dna ◽  
Acid Anhydrides

During modification of protein amino groups with carboxylic acid anhydrides, these reagents cause a fall in pH, which can be prevented by addition of base. Although unmodified nucleosomal particles are not affected by the local transient changes in pH induced by the base (NaOH) added to prevent a fall in pH during modification, the nucleosomal particles modified by acetic anhydride are dissociated, with release of single-stranded DNA.

scholarly journals Synthesis, Crystal Structure and Magnetic Behaviour of Novel 4f-2s Heterometalic One-Dimensional Coordination Polymers on the Base of 2-Furan-Carboxylic Acid

2009 ◽  
Vol 4 (2) ◽  
pp. 60-67
Author(s):  
Silvia Melnic ◽  
Denis Prodius ◽  
Sergiu Shova ◽  
Helen Stoeckli-Evans ◽  
Yurii Simonov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Carboxylic Acid ◽  
Ir Spectra ◽  
Single Crystal ◽  
General Formula ◽  
Coordination Polymers ◽  
Magnetic Behaviour ◽  
One Dimensional ◽  
X Ray

Nine new complexes with the general formula {[Ln2Ba(α-Fur)8(H2O)4]}n, where Ln = Nd3+, Sm3+, Eu3+, Pr3+, Gd3+, Tb3+, Ho3+, Er3+ and La3+; α-Fur ≡ C4H3OCOO, were synthesized and characterized by IR spectra, magnetism, X-ray single crystal and powder diffractions.

Synthese und Struktur von 1.2.3-Thiadiazol- und 1.2.3-Selenadiazol-Pentaearbonyl-Komplexen der Elemente Chrom und Wolfram / Synthesis and Structure of 1,2,3-Thiadiazol- and 1,2,3-Selenadiazol-Pentacarbonyl-Complexes of the Elements Chromium and Tungsten

1981 ◽  
Vol 36 (2) ◽  
pp. 172-179 ◽  
Author(s):  
Volker Bätzel ◽  
Roland Boese
Keyword(s):  
Carboxylic Acid ◽  
Ir Spectra ◽  
Ethyl Ester ◽  
Acid Ethyl Ester ◽  
X Ray ◽  
And Tungsten ◽  
Metal Fragment

Abstract From the reactions of (THF)M(CO)5 (M = Cr, W) with 4-phenyl-1,2,3-thiadiazol, 4-methyl-5-carboxylic acid-1,2,3-thiadiazol, 4-methyl-5-carboxylic acid ethyl ester-1,2,3-thiadiazol and 4-methyl-1,2,3-selenadiazol, pentacarbonyl-complexes are obtained as air stable compounds. IR spectra of products of similar reactions with M = Mo provide some evidence of the formation of analogous complexes. The thiadiazol complexes are also accessible directly, by photochemical displacement of carbonmonoxid in THF from the parent carbonyl. The X-ray structures of pentacarbonyl-(4-phenyl-1,2,3-thiadiazol)-tungsten and pentacarbonyl-(4-methyl-1,2,3-selenadiazol)-chromium show the coordina-tion of the ligand to the pentacarbonyl-metal-fragment via the nitrogen in position 2.

scholarly journals Study of the Effect of Substituents of ortho-Phenylenediamines in the Opening of Lactones and Lactams for Access to Benzimidazol-2-yl Alkanols and Benzimidazol-2-yl Alkylamines

Synlett ◽  
2020 ◽  
Vol 31 (12) ◽  
pp. 1216-1220
Author(s):  
Laurence Goossens ◽  
Omar Castillo-Aguilera ◽  
Patrick Depreux ◽  
Alexia Ballée ◽  
Florian Beaurain ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Acid Derivative ◽  
Bioactive Compounds ◽  
Effect Of Substituents ◽  
Electron Donating Groups ◽  
Carboxylic Acid Derivative

Benzimidazoles represent common chemical moieties in bioactive compounds. The synthesis of this heterocycle often involves a condensation of an ortho-phenylenediamine with a carboxylic acid derivative. The observed dialkylation of the starting ortho-phenylenediamine is avoided by opening of lactones or lactams. This strategy can directly yield 1H-benzimidazoles substituted at the 2-position by a functionalized chain. We present herein a study of the effect of different electron-withdrawing or electron-donating groups at the 4-position of ortho-phenylenediamines on the opening of lactones or lactams to synthesize benzimidazol-2-yl alkanols and benzimidazol-2-yl alkylamines.

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