ChemInform Abstract: REACTION OF INDOLES WITH A DIAZONIUM SALT (FAST RED B)

1973 ◽  
Vol 4 (30) ◽  
pp. no-no
Author(s):  
THOMAS F. SPANDE ◽  
GEORGE G. GLENNER
Keyword(s):  
Diazonium Salt ◽  
Fast Red

scholarly journals Kinetic analysis of chemical reactions coupled to an enzymic step. Application to acid phosphatase assay with Fast Red

1984 ◽  
Vol 223 (3) ◽  
pp. 633-638 ◽  
Author(s):  
J Escribano ◽  
F García-Carmona ◽  
F García-Cánovas ◽  
J L Iborra ◽  
J A Lozano
Keyword(s):  
Acid Phosphatase ◽  
Chemical Reactions ◽  
Rate Constants ◽  
Diazonium Salt ◽  
Specific Rate ◽  
Fast Red ◽  
Temperature Ranges ◽  
Lag Period ◽  
Ph Range ◽  
Phosphatase Assay

Acid phosphatase assay with alpha-naphthyl phosphate as substrate and the use of diazonium salt (Fast Red TR) for chromophore formation was kinetically analysed as a system of two chemical reactions coupled to an enzymic reaction. This system follows a mechanism defined as enzymic-chemical-chemical (EzCC). The accumulation of chromophore with reaction time presented a marked lag period, which was only dependent on the rate constants of the chemical reactions and was independent of the enzymic step. The specific rate constants of each chemical step were determined in 3.8-5.0 pH and 10-35 degrees C temperature ranges. Thermodynamic parameters of the chemical steps were also obtained. Measurement of acid phosphatase activity can be carried out in the pH range 3.8-5.0 (4.8 was optimal pH) without the need to eliminate the lag period.

Extraction Spectrophotometric Determination of [(2-Chlorophenyl)methylene]propane Dinitrile with Reactive Dyes of the Stabilized Diazonium Salt Type

1992 ◽  
Vol 57 (6) ◽  
pp. 1221-1229
Author(s):  
Emil Halámek ◽  
Zbyněk Kobliha
Keyword(s):  
Mass Spectrometry ◽  
Spectrophotometric Method ◽  
Azo Dye ◽  
Diazonium Salt ◽  
Reactive Dyes ◽  
Diazonium Salts ◽  
Fast Red ◽  
Hydrolysis Of ◽  
C Nmr

A spectrophotometric method has been developed for the determination of [(2-chlorophenyl)methylene]propane dinitrile (CS) stabilized by the diazonium salts Fast Red TR and Fast Blue B after extraction with chloroform. Mass spectrometry, 1H and 13C NMR and elemental analysis confirmed the presence of the hydrazoform of the azo dye formed by reaction with malononitrile, as a product of the alkaline hydrolysis of substance CS, and the diazonium salt Fast Red TR.

Technical Improvements in Measurement of L-Aspartate: 2-Oxoglutarate Aminotransferase Activity in Serum by Diazonium Salt Coupling

1973 ◽  
Vol 19 (7) ◽  
pp. 776-778 ◽  
Author(s):  
Leo G Morin ◽  
Jerome Prox
Keyword(s):  
Diazonium Salt ◽  
Transaminase Activity ◽  
Aminotransferase Activity ◽  
Glutamic Oxalacetic Transaminase ◽  
Color Development ◽  
Fast Red ◽  
Coupling Procedure ◽  
Diazonium Coupling

Abstract An improved diazonium coupling procedure is described for measurement of L-aspartate: 2-oxoglutarate aminotransferase (EC 2.6.1.1, formerly termed glutamic oxalacetic transaminase) activity in serum. A relatively pH-stable dye, 5-chloro-2-methoxyaniline-1-diazonium chloride (Fast Red RC) is used, with dimethylformamide and methanol to enhance and stabilize color development. A 15-min incubation is part of the procedure, and color development stabilizes within 5 min.

Reaction of indoles with a diazonium salt (Fast Red B)

1973 ◽  
Vol 95 (10) ◽  
pp. 3400-3402 ◽  
Author(s):  
Thomas F. Spande ◽  
George G. Glenner
Keyword(s):  
Diazonium Salt ◽  
Fast Red

Cross-Coupling Polymerization at Iodophenyl Thin Films Prepared by Spontaneous Grafting of a Diazonium Salt

2019 ◽  
Author(s):  
Nicholas Marshall ◽  
Andres Rodriguez
Keyword(s):  
Thin Films ◽  
Diazonium Salt ◽  
Cross Coupling ◽  
Coupling Polymerization

Development of a method for the surface-initiated Kumada cross-coupling polymerization based on 4-iodophenyldiazonium salt thin films, and use of this method to make very thick polythiophene brushes.<br>

scholarly journals Tuning the Covering on Gold Surfaces by Grafting Amino-Aryl Films Functionalized with Fe(II) Phthalocyanine: Performance on the Electrocatalysis of Oxygen Reduction

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1631
Author(s):  
Camila F. Olguín ◽  
Nicolás Agurto ◽  
Carlos P. Silva ◽  
Carolina P. Candia ◽  
Mireya Santander-Nelli ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Diazonium Salt ◽  
Gold Surface ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Salt Reduction ◽  
Surface Electrodes ◽  
Custom Made ◽  
Aryl Diazonium Salt ◽  
Inorganic Molecules

Current selective modification methods, coupled with functionalization through organic or inorganic molecules, are crucial for designing and constructing custom-made molecular materials that act as electroactive interfaces. A versatile method for derivatizing surfaces is through an aryl diazonium salt reduction reaction (DSRR). A prominent feature of this strategy is that it can be carried out on various materials. Using the DSRR, we modified gold surface electrodes with 4-aminebenzene from 4-nitrobenzenediazonium tetrafluoroborate (NBTF), regulating the deposited mass of the aryl film to achieve covering control on the electrode surface. We got different degrees of covering: monolayer, intermediate, and multilayer. Afterwards, the ArNO2 end groups were electrochemically reduced to ArNH2 and functionalized with Fe(II)-Phthalocyanine to study the catalytic performance for the oxygen reduction reaction (ORR). The thickness of the electrode covering determines its response in front of ORR. Interestingly, the experimental results showed that an intermediate covering film presents a better electrocatalytic response for ORR, driving the reaction by a four-electron pathway.

Impact of Chemical Modification on the Physical and Mechanical Properties of Tropical Wood Material

2012 ◽  
Vol 576 ◽  
pp. 314-317
Author(s):  
Sinin Hamdan ◽  
M. Saiful Islam
Keyword(s):  
Mechanical Properties ◽  
Diazonium Salt ◽  
Treated Wood ◽  
Coupling Reaction ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Ft Ir ◽  
Ir Analysis ◽  
D Values ◽  
Benzene Diazonium

Five types of selected tropical light hardwoods were chemically modified with benzene diazonium salt to improve their physical and mechanical properties. Benzene diazonium salt underwent a coupling reaction with wood which was confirmed through FT-IR analysis. The compressive modulus of the treated wood increased, whereas modulus of rupture was shown to decrease on treatment. The modified wood samples had higher hardness (Shore D) values compared to that of the control ones.

scholarly journals INFLUENCE OF CHEMICAL STRUCTURE ON THE RATE OF AZO COUPLING AND ITS SIGNIFICANCE IN HISTOCHEMICAL METHODOLOGY

1959 ◽  
Vol 7 (1) ◽  
pp. 50-65 ◽  
Author(s):  
MARVIN M. NACHLAS ◽  
THEODORE P. GOLDSTEIN ◽  
DAVID H. ROSENBLATT ◽  
MARVIN KIRSCH ◽  
ARNOLD M. SELIGMAN
Keyword(s):  
Aromatic Amines ◽  
Diazonium Salt ◽  
Tissue Sections ◽  
Coupling Techniques ◽  
Diazonium Ions ◽  
Coupling Rate ◽  
Diazonium Ion ◽  
Hydroxy Compounds ◽  
Positive Groups ◽  
Electro Negativity

Reliability of enzymatic localization in tissue sections by the simultaneous coupling techniques is dependent to a great extent upon the speed of coupling. Therefore, the influence on coupling rate of the structure of the diazonium ion and of the coupling component was studied. Electro-negative groups in the diazonium ion increase the rate of coupling, while the same groups in the coupling component decrease the rate. Electro-positive groups in the coupling component accelerate coupling, but slow it when present in the diazonium ion. The relation of coupling rate and electro-negativity of the substituents in the diazonium ion follows Hammett's equation (8). Although the relations is linear on coupling with aromatic hydroxy compounds, it is not so with aromatic amines. The most active diazonium ions showed no increase in coupling rate with aromatic amines. This suggests that for those enzymes hydrolyzing an ester link, increase of coupling rate might be accomplished by modifying the structure of either the coupling component used in the substrate or the diazonium salt. However, for enzymes splitting amide linkages, the only possibility of improving the localization is by modifying the structure of the coupling component.

Sign in / Sign up

Export Citation Format

Share Document