Mitra, S N

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tft~iaft J. Phy •. 43, 426, (196~J X-ray study of the orthorhombic modification of the para-acetotoluidide crystals By S. N. MITRA India!! School of Mines, Dka!!/xul" India. (ReceilJ<li 20 June 1969) Crystals of para-acetotoluidide (CH" CONH, C,H,. CH,) (BeilBte~ 1929) are grown out of saturated solution of alcohol by rapid evaporation. \ These crystals appear as thin prisms with a (100), b (010) and til (110) I faces bounded by r (101) and c (001) faces. They are examined with the ' help of a Fuess horizontal circle goniometer and the interfacial angles thus measured are found in good agreement with those recorded in Groth (1917). lhe crystals belong to the orthorhombic system. The crystals are first studied by the rotation method in a camera of 10 em. diameter as well as by the powder method in a Unicam camera of 19 CDL diameter, With Cu·k. radiation. The axial lengths are thus obtained as : a=12.98A', b=9.82A' and c=6.52A'. The specific gravity of the crystals is found by the /loatation method in a solution of ZnSO, in water, as 1.19. The number of molecules in the unit cell of the crystal comes out to be four only. The axial ratio of a : b : c is thus found to be 1.322 : 1 : 0.6639 as against 0.6515 : 1 : 0.3289 given by Groth (1917). Several zero layer·line and first layer lme Weissenberg photographs are taken about the a, b and c aXes respectively and the redexlons are analysed. From the reflexions in the photographs as analysed, it is concluded that: For hOD rcJlexloDs /, = 211 For 0k0 k = 2 .. and For J.ol refiexioDs"no conditiOD. For Ok! -For DOl ! - 2.. For hkO For hid " II The orthorhombic crystals of the para-aceto-toluidide are thus assig-ned the space-group P'I"" Structural analysis is in progress. The author expresses his grateful thanks to Prof. J. Dhar for sugges-ting the problem and taking keen interest in the work. RI!1'BRBNCES Boil.tein 1929, HIJtIdl>ooh der Org<miBh. Ohtoomio, !/ZO. uroth, P. 1917 Ohem .. ,&. K",.luUogropi.;,. '. 400. [ 426 

X-ray Study of the Orthorhombic Modification of the Para-Acetotoluidide Crystals

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X-ray Study of the Orthorhombic Modification of the Para-Acetotoluidide Crystals

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