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Which would have a larger Rf value fluorene or fluorenone?
Explain relative Rf values of fluorene and fluorenone. Fluorenone is more polar than fluorene because of its C=O. 0.4 = Fluorenone, 0.6 = Fluorene.
How do you calculate the Rf value?
The Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front (both measured from the origin).
What is a good Rf value in chromatography?
between 0.3 and 0.7
A desirable Rf value lies between 0.3 and 0.7, since it is likely that other compounds present in the mixture will be visible on the TLC plate when the Rf is in this range.
Is Fluorenone more polar than fluorene?
Fluorenone is more polar than fluorene because of its C=O. bond. Flask three was only supposed to have Fluorenone but this shows contamination of the other compound.
What do Rf values indicate?
The Rf values indicate how soluble the particular pigment is in the solvent by how high the pigment moves on the paper. Two pigments with the same Rf value are likely to be identical molecules. Small Rf values tend to indicate larger, less soluble pigments while the highly soluble pigments have an Rf value near to one.
Why is 9-fluorenone more polar than fluorene?
Fluorenone is more polar than Fluorene. Because the fluorene and hexanes are nonpolar, so they move quickly through the polar alumina gel. Because the 9-fluorenone is polar, it slowly moves down the column.
Where can fluorene be obtained for commercial use?
For commercial purposes it is obtained from coal tar. It is insoluble in water and soluble in many organic solvents. Although fluorene is obtained from coal tar, it can also be prepared by dehydrogenation of diphenylmethane. Alternatively, it can be prepared by the reduction of fluorenone with zinc.
What should the Koc of fluorenone be?
The Koc of fluorenone is estimated as approximately 2300(SRC), using a measured log Kow of 3.58(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that fluorenone has only slight mobility in soil(SRC).
What kind of solvent is fluorene soluble in?
Fluorenone is soluble in a wide range of organic solvents (solvents that are carbon-hydrogen based) including things like chloroform, methanol, ethanol, dichloromethane, and acetonitrile. It is NOT, however, soluble in water. Overall, fluorenone is a polar compound, mainly due to the presence of the ketone.
Why does a compound have a specific RF value?
A particular compound will travel the same distance along the stationary phase by a specific solvent (or solvent mixture) given that other experimental conditions are kept constant. In other words, every compound (dye, pigment, organic substance etc) have a specific Rf value for every specific solvent and solvent concentration.