Spectral Studies and Normal Coordinate Analysis of Some Symmetric 1,5-Diaryl-3-cyanoformazans

✍ Scribed by N.T. Abdel Ghani; Y.M. Issa; H. Mikosch; G. Bauer

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 55 KB
• Volume: 61
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1998.1680

✦ Synopsis

The 1,5-diaryl-3-cyanoformazans were prepared and subjected to IR, MS, 1 H NMR, and 13 C NMR spectral analysis. The results indicate the presence of a strong intramolecular hydrogen bond in the formazan molecule. Moreover, the two phenyl rings are equivalent and the C'N and NOH stretching vibrational modes are slightly affected with electron-withdrawing substituents and interact with the neighboring COC stretching mode. The syn, s-cis formazan form was supported by calculating the frequencies, normal coordinate analysis, force constant refinement, and group theory treatment. High quality of fitting between the experimental and calculated frequencies with all formazans has been achieved.