- Tytuł:
- Quantitative analysis of α-CL-20 polymorphic impurity in ε-CL-20 using Dispersive Raman Spectroscopy
- Autorzy:
-
Ghosh, M.
Venkatesan, V.
Sikder, N.
Sikder, A. K. - Powiązania:
- https://bibliotekanauki.pl/articles/951498.pdf
- Data publikacji:
- 2013
- Wydawca:
- Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
- Tematy:
-
CL-20
polymorphs
α-CL-20 impurity
Dispersive Raman Spectroscopy - Opis:
- α-CL-20 polymorphic impurity in ε-CL-20 studies have been carried out using Dispersive Raman Spectroscopy. ε-, β-, α- and γ-CL-20 polymorphs were produced using crystallization methods with sample recovery from the solution being >90%, and chemical purity of about 99%. The polymorphs prepared were characterized using Dispersive Raman Spectroscopy over the Raman shift region of 100-3500 cm-1 using a 514 nm argon ion laser. The experimental studies were supported by ab initio computations performed at B3LYP level using a 6-31+G** basis set. The computed vibrational frequencies of the CL-20 conformers correspond to the ε, β and α or γ-CL-20 polymorphs when compared with the observed frequencies. α-CL-20 shows a distinct feature at 280 cm-1 as compared with those of the ε-CL-20 polymorph. Using Dispersive Raman Spectroscopy, a linear relationship was demonstrated for the absolute peak height and absolute peak area ratio of α-CL-20 versus the weight percent of α-CL-20. This method enables a detection limit of this polymorphic impurity down to 2 wt%.
- Źródło:
-
Central European Journal of Energetic Materials; 2013, 10, 3; 419-438
1733-7178 - Pojawia się w:
- Central European Journal of Energetic Materials
- Dostawca treści:
- Biblioteka Nauki
Artykuł