Steel coated with copper

• Book ID: 104120687
• Publisher: Elsevier Science
• Year: 1915
• Tongue: English
• Weight: 66 KB
• Volume: 179
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(15)91168-7

✦ Synopsis

xxi, 44o.)--The appearance of light has been noted in several chemical reactions, notably in that of Grignard, when an ether solution of an alkyl halide reacts with magnesium dust. A red light is developed on mixing 35 c.c. of each of the following solutions: A I : 2 potassium carbonate solution, a 1 : IO pyrogallol solution, and a 35:IOO formaldehyde solution; then adding 5o c.c. of 30: Ioo hydrogen peroxide solution. Also phenylmagnesium bromide, in ether solution, develops an intense green light on contact with moist air. The effect is not, however, due to the moisture, but to oxidation. The luminescence is stronger in an atmosphere of pure oxygen than in other gases. Ether which has stood months over calcium chloride reacts well; some, but not all, specimens of official ether do so also. Chemiluminescence is observed with most organic magnesium compounds, and its intensity is directly proportional to the molecular weight of the halogen derivative.