A method for the identification of pure organic compounds by a systematic analytical procedure based on physical properties and chemical reactions Volume 3 - Tapa blanda
Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...components." On reduction, an azo dyestuff undergoes cleavage at each of the azo groups which it may contain, each nitrogen atom of each azo radical yielding an amino group. Henee one of the reduction products must always be identical with a "first component " except in cases when the first component itself contains reducible groups. Second and third components, on the contrary, are not obtained as reduction products, but we secure in their place their amine derivatives. Thus, Congo Red, which has benzidine as its first, and "naphthionic acid " as its second component, gives benzidine as its first reduction product, and di-aminonaphthalenesulphonic acid as its second reduction product. C0H4. N2C1 CeH«. N2. C,0H2. (SO2H)(NH2) + 2 C,0He. (NH2)(SO2H) = 2 HC1 + C.H,. N2C1 CCH4. N2. C,0H2. (SO2H)(NH2) Diazotized benzidine Naphthionic Acid. Congo Red. salt. C8H4. N: N. C.oHSCH)(NH2) C0H4. NH2 +2H2= +2C,0H5.(SO2H)(NH2)1. C„H4. N: N. C,0H5(SO2H)(NH2) C2H,. NH2 Congo Red. Benzidine. Amino-naphthionic Acid. Test 22. Absorption Spectra. Determine the exact positions in wave lengths of the maxima of the absorption bands appearing in the spectrum obtained by passing a beam of white light through a solution of the dyestuff into a spectrometer provided with cross hairs, a carefully calibrated scale, and a micrometer screw movement. The technique of the method may best be learned by a series of practice exercises, consulting Formanek's manuals (cf. p. 3) for detailed working directions. Observations.--The analyst who is provided with a suitable spectroscope, and has trained himself to be a skillful observer with the instrument, will have a great advantage over those who are limited to the use of dyeing and chemical tests. This is especia...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...components." On reduction, an azo dyestuff undergoes cleavage at each of the azo groups which it may contain, each nitrogen atom of each azo radical yielding an amino group. Henee one of the reduction products must always be identical with a "first component " except in cases when the first component itself contains reducible groups. Second and third components, on the contrary, are not obtained as reduction products, but we secure in their place their amine derivatives. Thus, Congo Red, which has benzidine as its first, and "naphthionic acid " as its second component, gives benzidine as its first reduction product, and di-aminonaphthalenesulphonic acid as its second reduction product. C0H4. N2C1 CeH«. N2. C,0H2. (SO2H)(NH2) + 2 C,0He. (NH2)(SO2H) = 2 HC1 + C.H,. N2C1 CCH4. N2. C,0H2. (SO2H)(NH2) Diazotized benzidine Naphthionic Acid. Congo Red. salt. C8H4. N: N. C.oHSCH)(NH2) C0H4. NH2 +2H2= +2C,0H5.(SO2H)(NH2)1. C„H4. N: N. C,0H5(SO2H)(NH2) C2H,. NH2 Congo Red. Benzidine. Amino-naphthionic Acid. Test 22. Absorption Spectra. Determine the exact positions in wave lengths of the maxima of the absorption bands appearing in the spectrum obtained by passing a beam of white light through a solution of the dyestuff into a spectrometer provided with cross hairs, a carefully calibrated scale, and a micrometer screw movement. The technique of the method may best be learned by a series of practice exercises, consulting Formanek's manuals (cf. p. 3) for detailed working directions. Observations.--The analyst who is provided with a suitable spectroscope, and has trained himself to be a skillful observer with the instrument, will have a great advantage over those who are limited to the use of dyeing and chemical tests. This is especia...
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