Why triethylene glycol luminol

A glow stick contains two separate solutions: one containing peroxide and the other containing diphenyl oxalate and a color dye. When the two solutions are mixed, which occurs upon activating the glow stick, the resulting reaction between the peroxide and diphenyl oxalate produces energy that excites the dye to a higher energy state.

As the reactants are exhausted, the dye returns to the ground state and releases light. This is what gives glow sticks their characteristic color. Luminol is a chemical that exhibits chemiluminescent properties and is utilized in a wide range of applications, most notably in forensics.

Luminol C 8 H 7 N 3 O 2 emits blue when it is mixed with an oxidizing agent. In the case of forensics, luminol reacts with the iron in hemoglobin, enabling forensic scientists to identify very small traces of blood.

Luminol is synthesized by the dehydration reaction of 3-nitrophthalic acid with hydrazine. The reaction is heated to remove water, and triethylene glycol is added to further increase the temperature. The nitro group of the 3-nitrophthalhydrazide is then reduced using sodium dithionite to form an amino group at high pH.

In basic conditions, the 3-nitrophthalhydrazide is soluble. The addition of glacial acetic acid precipitates the luminol. With potassium hydroxide, luminol forms a dianion. The hydroxide anions deprotonate the two hydrogens that are attached to the nitrogens in the luminol. Oxygen gas oxidizes luminol to its excited state. As it relaxes back to the ground state, it releases a blue-white light.

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Chemiluminescence In a chemiluminescent reaction, an electron is excited by absorbing heat that is released during a reaction. Luminol Luminol is a chemical that exhibits chemiluminescent properties and is utilized in a wide range of applications, most notably in forensics.

References Kotz, J. Chemistry and Chemical Reactivity. Please enter your institutional email to check if you have access to this content. Please create an account to get access. Forgot Password? Please enter your email address so we may send you a link to reset your password. Pages: [ 1 ] Go Down. Topic: Synthesis of Luminol Read times. In our organic chemistry lab with synthesized luminol. I understand the mechanism of the reaction, however I don't understand the purpose of triethylene glycol.

Why would the reaction of 3-Nitropthalic acid and hydrazine require triethylene glycol? It says it is "conveniently" carried out in a high boiling point solvent. Also what does the Na2S2O4 do to the 5-Nitropthalhydrazide to convert it into luminol.

Quote from: doublek on March 12, , AM.