Vibrational spectra of N-2′-methyl-propyliden-propan-2-amine: conformational analysis and influence of the nitrogen hybridization

Autor:	H. Zine, M.H. Baron, M.J. Coulange, A. Piart-Goypiron, J. Belloc
Rok vydání:	1993
Předmět:	chemistry.chemical_classification Aldimine Chloroform Stereochemistry General Engineering Aldehyde symbols.namesake chemistry.chemical_compound Crystallography chemistry Molecular vibration symbols Amine gas treating Raman spectroscopy Conformational isomerism Isopropyl
Zdroj:	Spectrochimica Acta Part A: Molecular Spectroscopy. 49:103-115
ISSN:	0584-8539
DOI:	10.1016/0584-8539(93)80265-c
Popis:	Infrared and Raman spectra of the (CH 3 ) 2 C 2′ HC 1′ HNCH(CH 3 ) 2 aldimine (NPP) and of two deuterated derivatives at C 1′ and C 2′ in the liquid, solid and solution phases have been recorded and assigned between 4000 and 130 cm −1 . NPP adopts the E configuration and two conformers at the C sp 2 and N sides are in equilibrium. Some vibrational modes are specifically assigned to the anticlinal ( ac ) or synperiplanar ( sp ) conformers at the C sp 2 side. The ac (C sp 2 ) form is dominant in the pure liquid whilst the sp (C sp 2 ) form is favoured in the solid and in chloroform. The vibrational dynamics of the isopropyl group on both sides of the CN bond are partially similar to that of the (CH 3 ) 2 CHCHO aldehyde on the one hand and of the (CH 3 ) 2 CHNH 2 amine on the other hand. When moving from the amine to the corresponding aldimine, changes about νNC and wCC 2 modes (at the N side) are related to electronic and geometrical effects as a consequence of the nitrogen hybridization change from sp 3 to sp 2 .
Databáze:	OpenAIRE
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