Bromination of alkenes with Br2. The upper picture is about the pure bromine and the bottom picture is from a dilute solution in chloroform.
Elemental bromine is a great reagent, it usually reacts well in most cases and due its intense color and odor it could be easily detected in the reaction mixture.
Long ago they also used it to find out, that is there an olefinic (double) bond in the organic molecule or not. The test was easy: add the organic substance to a dilute, but still visible bromine solution in an organic solvent and if the color fades, you have a double bond somewhere in the molecule. What happens? RCH=CHR’ + Br2 → RBrH2C-CHBrR’ where R and R’ is an alkyl, aryl, or any other organic group.
9:30 pm • 21 August 2014 • 41 notes • View comments
Just a small (50 cm3) separating funnel for small scale work.
9:30 pm • 20 August 2014 • 30 notes • View comments
This is a quite interesting thing. For days this compound was a near black oil and one morning these nice crystals appeared at the bottom of the beaker. The black/deep blue thing is a complex of copper(II)-chloride and R-phenylglycine methyl ester, the bright green compound is the not reacted copper(II)-chloride dihydrate.
The second picture is part of the gallery: Crystals from the lab on Behance. Visit it to see more adorable pictures from quite different crystals(:
The best pictures from the blog, what are tagged as my portfolio, including these pictures, could be purchased at Society6 as a high quality great looking print: http://society6.com/labphoto.
9:30 pm • 19 August 2014 • 69 notes • View comments
Chlorination of an aromatic compound.
Chlorine gas (that yellow gas in the flask) is passed into the flask, bubbled through the liquid at the bottom and it’s heated on a oil bath (not on the picture).
While the chlorine atoms are induced to the molecule side chains it gets a deeper orange color what indicates that something happens. If we would add some iron powder or a lewis acid like iron(III) chloride, the chlorine atoms would go on the aromatic carbons and not on the side chains.
9:30 pm • 18 August 2014 • 81 notes • View comments
Nothing special, just drying some diethyl ether with a chlorinated compound in it with anhydrous sodium sulfate.
Did you know, that while ether is a non water miscible solvent (solubility 69 g/L in water), it could contain up to 2% of its own weight of water.
9:30 pm • 17 August 2014 • 76 notes • View comments
The intense blue color of a freshly prepared copper(II)-amine complex.
Did you know that only the copper(II) amine complex has a blue color? If elemental copper is added to an e.g.: tetraamminecopper(II) chloride ([Cu(NH3)4]Cl2) solution and it is heated, the intense blue color will fade and a colorless or white powder will precipitate, the copper(I) complex. What happens? The copper(II) is reduced by elemental (0) copper to give the +1 oxidation state metal. Cu(+2) + Cu(0) = 2 Cu(+1)
9:30 pm • 16 August 2014 • 197 notes • View comments
A few liters (4) of freshly distilled phosphorus oxychloride. Hope that nobody will break these flasks in the fume hood.
POCl3 reacts with water, alcohols and with your skin to give hydrogen chloride and phosphoric acid or phosphate esters, respectively: O=PCl3 + 3 H2O → O=P(OH)3 + 3 HCl what means, it could cause serious burns if its gets on your hands.
9:30 pm • 15 August 2014 • 31 notes • View comments
When doing an organic chemical reaction and working with non miscible solvents like ether/water, dichloromethane/water, , toluene/water, chloroform/water, ect., it often happens that while you started from a completely transparent solution and added a solvent what will probably dissolve only the compound what you need, or not need, some insoluble participate forms between the two non miscible phase. Just as in this case.
9:30 pm • 14 August 2014 • 48 notes • View comments
Looking for a logo
Dear people of Tumblr,
I am looking for a graphic designer or anyone who could and would like to help me a bit by designing a logo for this tumblr page. As a compensation for the work, the “winner” will receive his/her favorite one from the 900 yet published picture from the blog as a 11x17 inch signed print.
The logo should be an original design of the author and not someone else work with minor modifications.
Anyone who would like to enter this contest, please send the designed logo in a minimum 1800x1300 pixel size til August 20 to: firstname.lastname@example.org
6:02 pm • 14 August 2014 • 16 notes • View comments
Crystallization of the purple impure compound. If we chose the right solvent or solvent mixture, the purple gunk will stay in the solution after cooling the mix and colorless crystals will form, what will be a highly pure compound of something what we need.
9:30 pm • 13 August 2014 • 69 notes • View comments