Bawa Kartar Singh

The diamagnetic susceptibilities of phthalic acid and phthalic anhydride

Summary1.The gram-molecular susceptibilities of carefully purified samples of phthalic acid and its anhydride are determined. The susceptibilities are: Phthalic acid, Xm=−81·24×10−6 Phthalic anhydride, Xm=−67·31×10−6 It is found that whereas the value of the gram-molecular susceptibility of phthalic acid found by Gray and Birse and ourselves is nearly equal, that for the anhydride is higher in our case.2.The difference in gram-molecular susceptibilities of dibasic acids and their anhydrides is nearly equal to that of water with minor variations, possibly due to different structures attached to the anhydride rings.3.The constitutive effect of the rings in the anhydrides of different dibasic acids has also been discussed.

The diamagnetic susceptibilities of succinic acid and succinic anhydride

Summary(1)Measurements have been made on the magnetic susceptibilities of succinic acid and its anhydride. The susceptibilities are:

Studies on the dependence of physiological action on chemical constitution

\chi _M = - 57 \cdot 47 \times 10^{ - 6} for the acid

STUDIE

;

ulphonic Acid with o-) m- and p-Iodanilines

\chi _M = - 43 \cdot 85 \times 10^{ - 6} for the anhydride

The refractive dispersive power of organic compounds Part II. The camphor-β-sulphonates (d- and dl-) of o-,m-,p-Toluidines,o-,m-,p-Iodanilines, α-amino-pyridine, α-aminothiazole, p-aminobenzenesulphonamide and 6-methoxy-8-aminoqinoline

.(2)The difference between the gram-molecular susceptibilities of succinic acid and its anhydride is that of a molecule of water. This is to be expected, both from considerations based on the additivity law, and from observations on other acids and their anhydrides, namely camphoric acid, maleic acid and their corresponding anhydrides.(3)The difference of about 13 is numerically more than can be attributed to two atoms of hydrogen and one of singly linked oxygen, which will give only 10·47.(4)The extra effect is attributed to the formation of a ring in the anhydride, the paramagnetic contribution of which may be taken as about +2·5.