Absorption spectra of diphenyldiacetylene and naphthazarine in crystalline state as well as in solution have been measured quantitatively in the visible and ultraviolet region. In the former compound, it has been found that the acetylene group indicates similar dichroic property to the benzene ring except for the fact that the dichroism of the former is more remarkable than that of the latter. From the dichroic property of naphthazarine, it has been concluded that the substance exists as the monomer and does not form the molecular compound like quinhydrone even in crystalline state.
The amount of hydration for alcohols in aqueous solution was estimated, assuming that the molecular sound velocity of a solution can be calculated from that for each constituent of the solution and their molal fraction, thereby regarding the water of hydration as the third component different from the free solvent and rather resembling ice as far as the sound velocity is concerned. The quantities thus calculated showed the general behavior of hydration water and also proved to be proportional to the heat of hydration.
(1) Several methods of determining CMC are compared and criticised. (2) A new method of determining 1st CMC from viscosity is experimentally established. (3) A new method of determining 2nd CMC from viscosity is established by transforming and viscosity in the new variables. (4) Of each soap, characteristic constants [η1] and [η2] are discovered, and it is shown that a definite relation is concluded between these values and monomer molecular weight. (5) The theoretical explanation of these newly found phenomena has not yet been made.
The oxygen equilibrium of hemerythrin and its Bohr effect were studied by spectrophotometric method. It was found that the oxygen combining centers in this molecule are not completely independent but the stabilizing effect is weak. The value of n in Hill’s equation is equal to 1.37. The partial pressure of oxygen in equilibrium with the solution of 50 % saturated hemerythrin is 2.9 mm. Hg. Within the pH. range of stable hemerythrin solution, there is no dependence of oxygen equilibrium upon pH, hence no oxygen-linked acid groups are present in hemerythrin molecule.
The dipole moments of three methyltro-polones and their bromoderivatives were measured in benzene solution at 25° or 30°. The values obtained were compared with the theoretical data for the moments of these compounds with substituents at various presumed positions. The final decision of the position of substitu-ents were made as shown in Table 3.
A new procedure for preparing β-keto esters from methyl ketones, sodamide and diethyl carbonate using these reagents in the molar ratio of 1:3:3 is reported. The yields of β-keto esters approach to those of the preparation using sodium hydride as condensing agent. Furthermore, some cyclopentenolones were prepared from the β-keto esters synthesized by this-procedure.
Chelating action of salicylic, sulphosalicylic and 2-hydroxy-3-naphthoic acids towards iron was investigated quantitatively, and it was found that they combine with one-to-one molecular ratio with iron. In order for these substances to be used as colorimetric reagents for the determination of iron, it is desirable that the reagents as well as their complexes be well soluble in water, and that the equilibrium contants of the complexes be sufficiently large so that the proportionality between the absorbance caused by complex and the concentration of iron or chelating agent may hold in a wide range. In this respect sulphosalicylic acid may be regarded as most suitable, among the three hydroxycarboxylic acids studied, as a reagent for iron determination. In view of the fact that the introduction of sulphonyl group into salicylic acid caused the increase of K, it may be expected that a more suitable iron reagents would be obtained by further introduction of sulphonyl group in salicylic acid.