Microwave Spectrum of trans-Nitrosoethylene-15N and Pyrolysis Mechanism of Chloroacetaldehyde Oxime

✍ Scribed by T. Sakaizumi; M. Nishikawa; O. Ohashi

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 307 KB
• Volume: 171
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1138

✦ Synopsis

The microwave spectrum of trans-nitrosoethylene- ({ }^{15} \mathrm{~N}) ( nitrosoethene) generated by pyrolysis of chloroacetaldehyde oxime- ({ }^{15} \mathrm{~N}) has been observed in the frequency range from 8.0 to 40.0 GHz. The rotational constants of the ({ }^{15} \mathrm{~N}) species are determined to be (A=50390(201), B==) 5057.00(3), and (C=4605.29(3) \mathrm{MHz}). The (r_{\mathrm{s}})-coordinates ( (a) and (b) ) of the nitrogen atom of trans-nitrosoethylene are determined to be (0.540(1)) and (0.453 \AA), respectively. The three (r_{0}) structural parameters were fitted to four rotational constants ( (B) and (C) ) of the normal and ({ }^{15} \mathrm{~N}) species. The bond length of (r(\mathrm{C}-\mathrm{N})) and two bond angles of (\langle\mathrm{C} \cdots \mathrm{C}-\mathrm{N}) and (\langle\mathrm{C}-\mathrm{N}=\mathrm{O}) obtained are (1.439(10) \AA, 117.1(10)^{\circ}), and (112.7(10)^{\circ}). respectively. The possible pyrolysis mechanism of chloroacetaldehyde oxime was discussed on the basis of detecting the three pyrolysates (\left(\mathrm{CH}{2}-\mathrm{CH}-{ }^{15} \mathrm{NO}, \mathrm{HC}^{15} \mathrm{~N}\right.), and (\left.\mathrm{CH}{2}=\mathrm{O}\right)) by microwave spectroscopy. c. 1995 Academic Press. Inc.