Light Absorption Properties
Methylene blue is a potent cationic dye with maximum absorption of light around 670 nm. The specifics of absorption depend on a number of factors, including protonation, adsorption to other materials, and metachromasy - the formation of dimers and higher-order aggregates depending on concentration and other interactions:
| Species | Absorption peak | Extinction coefficient (dm3/mole·cm) |
|---|---|---|
| MB+ (solution) | 664 | 95000 |
| MBH2+ (solution) | 741 | 76000 |
| (MB+)2 (solution) | 605 | 132000 |
| (MB+)3 (solution) | 580 | 110000 |
| MB+ (adsorbed on clay) | 673 | 116000 |
| MBH2+ (adsorbed on clay) | 763 | 86000 |
| (MB+)2 (adsorbed on clay) | 596 | 80000 |
| (MB+)3 (adsorbed on clay) | 570 | 114000 |
Read more about this topic: Methylene Blue
Famous quotes containing the words light, absorption and/or properties:
“Irrational streams of blood are staining earth;
Empedocles has thrown all things about;
Hector is dead and there’s a light in Troy;
We that look on but laugh in tragic joy.”
—William Butler Yeats (1865–1939)
“The radio ... goes on early in the morning and is listened to at all hours of the day, until nine, ten and often eleven o’clock in the evening. This is certainly a sign that the grown-ups have infinite patience, but it also means that the power of absorption of their brains is pretty limited, with exceptions, of course—I don’t want to hurt anyone’s feelings. One or two news bulletins would be ample per day! But the old geese, well—I’ve said my piece!”
—Anne Frank (1929–1945)
“The reason why men enter into society, is the preservation of their property; and the end why they choose and authorize a legislative, is, that there may be laws made, and rules set, as guards and fences to the properties of all the members of the society: to limit the power, and moderate the dominion, of every part and member of the society.”
—John Locke (1632–1704)