1. Luminol: Structure, Synthesis, chemical reaction, and its function.
By: Hau Huynh

2. Abstract
Chemiluminescence is the emission of light during a chemical reaction. Luminol is used to reveal a light-producing chemical reaction between chemicals and hemoglobin, an oxygen-carrying protein in the blood. The focus of this presentation will be on the synthesis of luminol, the chemical reaction, and how investigators use luminol to solve the crimes.

3. Outline A. What is chemiluminescene? B. The structure of Luminol.
C. Spectroscopic features
IR, C NMR, H NMR
D. Synthesis of Luminol
E. The chemical reaction
F. Applications
G. Conclusion
H. Reference

4. What is chemiluminescence?
Chemiluminescence is the emission of light during a chemical reaction.
A molecule that is chemiluminescent is oxidized in a chemical reaction to an excited state product and emits light upon deexcitation.
Chemiluminescence is distinct from fluorescence and phosphorescence in that a chemical is used to excite a molecule and an external source of photons is not needed.
Luminol is chemiluminescent molecule which was discovered by the German scientist H.O. Albrecht in It has been used in many chemical applications because of its chemiluminescent properties.

5. Structure of luminol Name: 5-amino-2,3-dihydro-1,4-phthalazine-dione .
Formula : C8H7N3O2
Melting point: oC

6. IR
C=0

7. C NMR C3 C2 C6 C7 C5 C4 C1 C8

8. H NMR Hd Hb Ha Hc

9. The synthesis of Luminol
hydrazine
3-nitrophthalic acid

10. The synthesis of Luminol
3-nitrophthalic acid (1) combines with aqueous hydrazine in a triethylene glycol solution and under heat, which substitutes the carboxylic acid -OH groups with -NH groups.
This releases two water molecules and creates 3-nitrophthalhydrazide (2). 3-nitrophthalhydrazide combines with aqueous sodium hydrosulfite, which substitutes amino groups for the nitro groups on the benzene ring.

11. The chemical reaction of Luminol
3-aminophthalate

12. The chemical reaction of Luminol
3-aminophthalhydrazide (4) combines with a basic solution, which removes the hydrogen protons from the nitro groups to release two water molecules.
The resulting molecule (5) undergoes keto-enol tautomerization to move the negative formal charges onto the carbonyl oxygens.
A metal ion catalyst (such as copper (II), iron (III) or cobalt (II)) decomposes the hydrogen peroxide (or other oxidizing molecule) solution to make peroxide molecules available.
A peroxide molecule is cyclically added to the enolate form (6) of the intermediate molecule. Nitrogen gas is released and 3-aminophthalate is formed in its triplet state (7). The electrons undergo intersystem crossing and then decay to their ground state, which emits a photon of light (8)

13. Applications
A basic luminol solution combined with hydrogen peroxide and a thickening agent can be sprayed on surfaces with suspected blood traces. The solution will glow if catalyzed by the presence of a metal ion, such as iron in blood hemoglobin.
Disadvantage
Luminol can be catalyzed by substances such as bleach, copper, potassium permanganate (found in many dyes), saliva, brain tissue, bone marrow, rust, and vegetable enzymes.
Secondly, luminol can destroy some genetic markers in cell DNA.
Thirdly, it can smear bloody impressions and make prints and splatters more difficult to analyze.

14. Applications Biology and Chemistry Research Commercial
In biology research, Luminol can detect proteins and DNA in very small concentrations.
In chemistry research, concentration of a metal ion can be detected and reaction rate analysis of oxidizers can be tracked by the intensity of the glow of luminol.
Commercial
an emergency light source for vehicles, businesses, schools, and the military. 
Glowsticks are occasionally made using luminol, which are sold at many events

15. Conclusion
Luminol is a chemiluminescent compound, which means that a release of light is a result of a chemical reaction.
When luminol is placed in a basic solution, the luminol is oxidized.
Luminol is used in biology and biochemistry for a multitude of testing
This hemoglobin reacts with the luminol as the catalyst.

16. Reference http://www.sas.upenn.edu/~hickeyj/lumrxn.html
Journal of Physical Chemistry B July 26, 2001 v105 i29 p
The American Journal of Physiology April 2000 v278 i4 pC646
Journal of the American Chemical Society Sept 4, 2002 v124 i35 p10250(2)