X-Ray Diffraction, Thermal and Spectroscopic Studies on 2,4-Dinitrodiphenylamine (DNDPA)

✍ Scribed by R. M. Roy; K. V. Prabhakaran; E. M. Kurian

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 126 KB
• Volume: 24
• Category: Article
• ISSN: 0721-3115
• DOI: 10.1002/(sici)1521-4087(199902)24:1<54::aid-prep54>3.0.co;2-n

✦ Synopsis

2,4-Dinitrodiphenylamine (DNDPA) has been studied as regards its crystal structure and thermal decomposition characteristics using Xray diffraction (XRD), simultaneous thermal analysis, ultraviolet and visible spectroscopy, infrared spectroscopy, hot-stage microscopy and high performance liquid chromatography (HPLC). The elementary cell parameters obtained from the XRD pattern are a 17.002 A Ê , b 17.002 A Ê , c 20.400 A Ê . The crystal structure belongs to the hexagonal system with cya ratio 1.1999. IR spectra of 2,4-DNDPA have also been recorded and the bands assigned. Kinetics of thermolysis has been followed both by isothermal thermogravimetry (TG) and HPLC. The best linearity with a correlation coef®cient of 0.994 was obtained for the two-dimensional diffusion controlled equation in TG. Activation energy was found to be 83.0 kJymol and log A (in s À1 ) 6.0 from isothermal TG. The rupture of the C±NH bond followed by the C±NO 2 bond constitutes the primary step in the thermolysis and the decomposition is free-radical assisted.