THERMODYNAOFM SOLUTIONS.pdfVIP

April 20, 1959 THERMODYNAMICSOF D~~~~~~ SOLUTIONS 1s59 gested that these bands result from the NH and the cold finger combines with undecomposed hy- NHz radicals, respectively. In connection with drazoic acid to form ammonium azide. The stoichi- the suggestion that NHUradicals are present in the ometry of the decomposition is in agreement with blue material, we have failed to find any trace of this supposition so that the substance giving the hydrazine in the warmed up product and have con- blue color can be present in only small amount. cluded that if NH2 radicals are present, it can be Both Mador and william^,^ as well as Becker, Pi- present only in very minute concentration. mente1 and Van Thiel,* observed that the amount Originally2 we thought that hydrazoic acid un- of ammonium azide present did not increase on derwent a primary decomposition according to the warming. equation HN3 4Nz + NH and much of the N H To sum up, we do not yet even after some ten reached the color finger and was frozen either as years of intensive work have any proof of the con- a monomer, a polymer or a mixture of these. The stitution of the blue material. We have even ex- ammonium azide was supposed to be formed at the amined the possibility that electrons might be transition temperature of the blue material since trapped in the ammonium azide and that we might ammonium azide may be written (NH)4. More have