| Autor: |
Silvino AC; Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, CT, Bloco J, Ilha do Fundão, Rio de Janeiro, RJ 21945-970, Brazil., Torres JM; Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, CT, Bloco J, Ilha do Fundão, Rio de Janeiro, RJ 21945-970, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Acta crystallographica. Section E, Crystallographic communications [Acta Crystallogr E Crystallogr Commun] 2015 May 09; Vol. 71 (Pt 6), pp. o385-6. Date of Electronic Publication: 2015 May 09 (Print Publication: 2015). |
| DOI: |
10.1107/S2056989015008610 |
| Abstrakt: |
The whole molecule of the title compound, C22H28N2, (I), is generated by inversion symmetry. The mol-ecule is rather similar to that of 2,3-bis-[(2-tert-butyl-phen-yl)imino]-butane, (II), a di-imine ligand comprising similar structural features [Ferreira et al. (2006 ▶). Acta Cryst. E62, o4282-o4284]. Both ligands crystallize with the -N=C(R)-C(R)=N- group around an inversion centre, in a trans configuration. Comparing the two structures, it may be noted that the independent planar groups in both mol-ecules [the central link, -N=C(R)-C(R)=N-, and the terminal aromatic ring] subtend an angle of 69.6 (1)° in (II) and 49.4 (2)° in (I). Ferreira and co-workers proposed that such angle deviation may be ascribed to the presence of two non-classical intra-molecular hydrogen bonds and steric factors. In fact, in (I), similar non-classical hydrogen bonds are observed, and the larger angular deviation in (II) may be assigned to the presence of methyl groups in the di-imino fragment, which can cause steric hindrance due to the presence of bulky tert-butyl substituents in the aromatic rings. The C=N bond lengths are similar in both compounds and agree with comonly accepted values. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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