. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 45 which have a wide band from 3 to 4/A and a transparent region from 4-5 to 5-5 /"-, followed by opacity beyond 6/x,. It is known that for alcohols the large band in the region of 3 /A is the composite of two bands situated at 3 and at /A. CHLORAL HYDRATB (CC1SCH(OH)2). (Curve b, fig. 31.) The constitution of this compound is uncertain. For the present examination the crystals were melted between plates of rock salt, and placed over P2O5 to dry and recrystallize. The transmission curve shows ail the water bands
. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 45 which have a wide band from 3 to 4/A and a transparent region from 4-5 to 5-5 /"-, followed by opacity beyond 6/x,. It is known that for alcohols the large band in the region of 3 /A is the composite of two bands situated at 3 and at /A. CHLORAL HYDRATB (CC1SCH(OH)2). (Curve b, fig. 31.) The constitution of this compound is uncertain. For the present examination the crystals were melted between plates of rock salt, and placed over P2O5 to dry and recrystallize. The transmission curve shows ail the water bands; although it is not considered water of crystallization, curve c shows the region at 3 /* after the film stood over P,O5 for six days and had crystallized into an opaque mass. Chloral. to 3 4 S 6 7 8 FIG. 31.—Mantiite(a); Chloralhydrate. hydrate has the following bands: , 2, 3, , , , , , , , and 8 p. Curve c is b after crystallizing several days. In the foregoing dozen minerals containing hydroxyl groups there is only one, or possibly two, viz, manganite and datolite, which appear to be exceptions to the rule that hydroxyls have a band at 3 p. It will, of course, be understood that this decision is also based upon previously studied compounds referred to in the text. Several other minerals in which the constitution is less understood, but which are supposed to contain hydroxyl groups, for example ser- pentine and epidote, will be considered later on, where it will be found that the 3 /n band is also very Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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