66571-30-0

Basic information

• Product Name: 1-(4-pyridinyl)-1H-1,2,3-benzotriazole
• Synonyms: 1-(4-pyridinyl)-1H-1,2,3-benzotriazole;1-pyridin-4-ylbenzotraizole
• CAS NO: 66571-30-0
• Molecular Formula: C11H8N4
• Molecular Weight: 196.20802
• Mol File: 66571-30-0.mol
• Article Data: 5

Chemical Properties

• Boiling Point: 399.5°Cat760mmHg
• Flash Point: 195.4°C
• Appearance: /
• Density: 1.31g/cm³
• Vapor Pressure: 1.36E-06mmHg at 25°C
• Refractive Index: 1.717
• CAS DataBase Reference: 1-(4-pyridinyl)-1H-1,2,3-benzotriazole(CAS DataBase Reference)
• NIST Chemistry Reference: 1-(4-pyridinyl)-1H-1,2,3-benzotriazole(66571-30-0)
• EPA Substance Registry System: 1-(4-pyridinyl)-1H-1,2,3-benzotriazole(66571-30-0)

Safety Data

• Hazardous Substances Data: 66571-30-0(Hazardous Substances Data)

Usage

General Description

1-(4-pyridinyl)-1H-1,2,3-benzotriazole, also known as PBT, is a chemical compound that belongs to the class of benzotriazoles. It is commonly used as a corrosion inhibitor in industrial applications, particularly in the protection of metals such as copper, brass, and aluminum. PBT is also used as a stabilizer in plastics and polymers, as well as in the production of dyes and pigments. It is known for its high thermal stability and resistance to UV radiation, making it a valuable additive in various products. However, PBT has raised environmental concerns due to its potential toxicity and bioaccumulation in aquatic organisms. As a result, its use is regulated in some regions to minimize its impact on the environment.

InChI:InChI=1/C11H8N4/c1-2-4-11-10(3-1)13-14-15(11)9-5-7-12-8-6-9/h1-8H

Upstream product

• 95-14-7 1,2,3-Benzotriazole 
• 22752-98-3 N-(4-pyridyl)pyridinium hydrochloride 
• 65053-26-1 N-γ-pyridyl-o-phenylenediamine 
• 71831-67-9 4'-Benzotriazol-1-yl-2,6-dimethyl-4'H-[1,1']bipyridinyl-4-one 
• 626-61-9 4-Chloropyridine 
• 95-54-5 1,2-diamino-benzene 

Relevant articles and documents

Alternate synthesis for diazoline

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Fluorescence Studies with Tryptophan Analogues: Excited State Interactions Involving the Side Chain Amino Group

The fluorescence of a large set of tryptophan analogues, including several that are conformationally constrained, was studied.The constrained analogues include tetrahydrocarboline-3-carboxylic acid and 3-amino-3-carboxytetrahydrocarbazole.Steady state and time-resolved fluorescence measurements were made as a function of pH.The fluorescence quantum yields of the constrained analogues are higher than those for the unconstrained counterparts.The emission intensity of the constrained analogues, as well as 4-methyltryptophan, decreases with deprotonation of the side chain α-ammonium groups; this is in contrast to the increase in fluorescence of tryptophan with deprotonation of this group.These results are consistent with the existence of excited state proton transfer to carbon 4 of the indole ring as a quenching mechanism, which is sterically prohibited in the constrained analogues and 4-methyltryptophan.From quantum yield and lifetime data (most decays are nonexponential), the effective rate constant for nonradiative depopulation of the excited state was calculated.For tryptophan analogues having two side chain functional groups, there is a synergistic effect; the presence of two side chain groups causes more quenching than expected from the sum of the individual contributions.For analogues having an α-ammonium group, this synergism appears to be correlated with an induced change in the pKa of this group.Deprotonation of this α-ammonium group also caused a red shift in the emission of these compounds; this appears to be due to electrostatic repulsion between the α-NH3+ group and the excited indole dipole.

Synthetic Applications of N-N Linked Heterocycles. Part 9. Preparation of α-(4-Pyridyl)nitroalkanes and N-(4-Pyridyl)azoles by Regiospecific Attack of Nitroalkyl and Azolyl Anions on N-(2,6-Dimethyl-4-oxopyridin-1-yl)pyridinium Salts

Sodium salts of nitroalkanes and of azoles react with N-(2,6-dimethyl-4-oxopyridin-1-yl)pyridinium salts (1) - (3) to give regiospecifically 1,4-dihydropyridines (12) - (14), (15), and (16) in high yields.Photolysis of the dihydropyridines gives α-(4-pyri