Elementarzellen und Raumgruppen der cyclischen Urethan-Oligomeren 1,8-Diaza-10,15-dioxa-9,16-dioxocyclohexadecan und 1,8,17,24-Tetraaza-10,15,26,31-tetraoxa-9,16,25,32-tetraoxo-cyclo-duotriakontan
Abstract
<h2>Acta Crystallographica</h2><h3></h3><h3>0365-110X</h3> <h2>short communications</h2> Volume 14 Part 8 Pages 895-896 August 1961 <h2>Elementarzellen und Raumgruppen der cyclischen Urethan-Oligomeren 1,8-Diaza-10,15-dioxa-9,16-dioxocyclohexadecan und 1,8,17,24-Tetraaza-10,15,26,31-tetraoxa-9,16,25,32-tetraoxo-cyclo-duotriakontan</h2> W. L. Haas Acta Cryst. (1961). 14, 895 Crystallographic properties of 4-picoline-N-oxide. By HARRY A. ROSE, Analytical Research Department, Eli Lilly and Co., Indianapolis, Indiana, U.S.A. (Received 6 February 1961) The compound 4-picoline-N-oxide is represented by the following formula : H.~C--~N --~ 0 Crystallization from benzene-petroleum ether solution gives tetragonal bipyramids showing the 101 faces. The sample used for the powder pattern melted in the range of 183.5-185.0 °C. The crystal system is tetragonal with 8 molecules of C6HTNO per cell. The observed density is 1.168 g.cm.-3 (displacement) while the density cal- culated from X-ray data is 1.132 g.cm.-3 a=b=8.04, c=19.84A. The space group, based on the observed systematic extinctions is C~-I41. If this assignment is correct, the crystal is the first found in this space group (Donnay & Nowacki, 1954). The optical properties are: E > 1.70, W = 1.504, optic sign +. The powder data (Table 1) were obtained using a camera 114.6 mm. in diameter with copper radiation and nickel filter. The indexing was done on the basis of a axis and c axis