§ 668. Hexamethylenediamine, C6H16N2.—Hexamethylenediamine has been found by A. Garcia[664] in a putrefying mixture of horse-flesh and pancreas.
[664] Zeit. f. physiol. Chemie, xvii. 543-555.
§ 669. Diethylenediamine, C4H10N2, is a crystalline substance, melting-point 104°, boiling-point 145°-146°. After melting, it solidifies on cooling, forming a hard crystalline mass. It is extremely soluble in water, and is deposited from alcohol in large transparent crystals. A technical product called “spermin piperazidin” or “piperazine” has been found by A. W. v. Hoffmann[665] to be identical with diethylenediamine. The hydrochloride crystallises in colourless needles, insoluble in alcohol, readily soluble in water. The platinochloride, C4H10N2H2PtCl6, is in small yellow needles, and is fairly easily soluble in hot water, but dissolves but slightly in hot alcohol. The mercuro-chloride, C4H10N2H2HgCl4, crystallises in concentrically grouped needles, and is readily soluble in hot water, but is reprecipitated on adding alcohol. The picrate, C4H10N2,C6H2(NO2)3OH, crystallises from water in yellow needles, almost insoluble in alcohol.[666]
[665] Ber., xxiii. 3297-3303.
[666] Sieber, J., Ber., xxiii. 326-327.
§ 670. Mydaleine is a poisonous base discovered by Brieger in putrid animal matters. It is probably a diamine, but has not been obtained in sufficient quantity for accurate chemical study. The platinochloride is extremely soluble in water, and only comes down from an absolute alcohol solution. It has been obtained in a crystalline form, giving on analysis 38·74 per cent. of platinum, C. 10·83 per cent., H. 3·23 per cent.