3225-29-4

Basic information

• Product Name: semiquinone radicals
• Synonyms: semiquinone radicals;(4-Oxylatobenzen-1-yloxy)radical;(4-Oxylatophenoxy)radical;4-Oxylatophenoxy radical;Semiquinone radical
• CAS NO: 3225-29-4
• Molecular Formula: C₆H₄O₂
• Molecular Weight: 108.1
• Mol File: 3225-29-4.mol
• Article Data: 34

Chemical Properties

• Boiling Point: 174°Cat760mmHg
• Flash Point: 59.3°C
• Appearance: /
• Density: 1.256g/cm³
• CAS DataBase Reference: semiquinone radicals(CAS DataBase Reference)
• NIST Chemistry Reference: semiquinone radicals(3225-29-4)
• EPA Substance Registry System: semiquinone radicals(3225-29-4)

Safety Data

• Hazardous Substances Data: 3225-29-4(Hazardous Substances Data)

Upstream product

• 110-86-1 pyridine 
• 56-23-5 tetrachloromethane 
• 63517-17-9 Oxazine-118 
• 50-99-7 glucose 
• 581-30-6 3H-Phenothiazin-3-one 
• 64-17-5 ethanol 
• 3625-57-8 nile blue A 
• 28286-71-7 3,3'-dihydroxy-1H,1'H-[2,2']biindolyl-5,5'-disulfonic acid 
• 120-80-9 benzene-1,2-diol 
• 605-18-5 3,3'-dioxo-1,3,1',3'-tetrahydro-[2,2']biindolylidene-5-sulfonic acid 
• 483-20-5 indigo carmine 
• 138574-86-4 indigo trisulfonate 
• 25180-62-5 3,3'-dioxo-1,3,1',3'-tetrahydro-[2,2']biindolylidene-5,7,5',7'-tetrasulfonic acid 
• 68141-98-0 N-(4-Bromophenyl)-1,4-benzoquinone monoimine 

Downstream Products

• 123-31-9 hydroquinone 
• 106-51-4 p-benzoquinone 
• 106-51-4 1,4-benzoquinone ?-dianion 
• 75877-78-0 (4-chlorophenyl)diazenyl radical 

Relevant articles and documents

Electron-transfer studies of a peroxide dianion

A peroxide dianion (O22-) can be isolated within the cavity of hexacarboxamide cryptand, [(O2)∪mBDCA-5t-H 6]2-, stabilized by hydrogen bonding but otherwise free of proton or metal-ion association. This feature has allowed the electron-transfer (ET) kinetics of isolated peroxide to be examined chemically and electrochemically. The ET of [(O2)∪mBDCA-5t-H6] 2- with a series of seven quinones, with reduction potentials spanning 1 V, has been examined by stopped-flow spectroscopy. The kinetics of the homogeneous ET reaction has been correlated to heterogeneous ET kinetics as measured electrochemically to provide a unified description of ET between the Butler-Volmer and Marcus models. The chemical and electrochemical oxidation kinetics together indicate that the oxidative ET of O22- occurs by an outer-sphere mechanism that exhibits significant nonadiabatic character, suggesting that the highest occupied molecular orbital of O 22- within the cryptand is sterically shielded from the oxidizing species. An understanding of the ET chemistry of a free peroxide dianion will be useful in studies of metal-air batteries and the use of [(O 2)∪mBDCA-5t-H6]2- as a chemical reagent.

Investigation of the oxidation of hydroquinone at the liquid/liquid interface

The oxidation of hydroquinone (QH2) was investigated for the first time at liquid/liquid (L/L) interface by scanning electrochemical microscopy (SECM). In this study, electron transfer (ET) from QH2 in aqueous to ferrocene (Fc) in nitrobenzene (NB) was probed. The apparent heterogeneous rate constants for ET reactions were obtained by fitting the experimental approach curves to the theoretical values. The results showed that the rate constants for oxidation reaction of QH2 were sensitive to the changes of the driving force, which increased as the driving force increased. In addition, factors that would affect ET of QH2 were studied. Experimental results indicated ion situation around QH2 molecule could change the magnitude of the rate constants because the capability of oxidation of QH2 would be affected by them.

EPR spectroscopic investigation of radical-induced degradation of partially fluorinated aromatic model compounds for fuel cell membranes

EPR spectroscopic investigations of reactions between monomeric model compounds representing typical structural moieties of poly(aryl) ionomers and photochemically generated hydroxyl radicals are reported. Deoxygenated solutions of the model compounds (in