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An ortho-rhom-bic polymorph of pyrazino-[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile.
- Source :
-
Acta crystallographica. Section E, Structure reports online [Acta Crystallogr Sect E Struct Rep Online] 2011 Dec 01; Vol. 67 (Pt 12), pp. o3250-1. Date of Electronic Publication: 2011 Nov 09. - Publication Year :
- 2011
-
Abstract
- The title compound, C(16)H(6)N(6), is a polymorph of the previously reported structure [Kozlov & Goldberg (2008 ▶). Acta Cryst. C64, o498-o501]. Unlike the previously reported monoclinic polymorph (space group P2(1)/c, Z = 8), the title compound reveals ortho-rhom-bic symmetry (space group Pnma, Z = 4). The mol-ecule shows crystallographic mirror symmetry, while the previously reported structure exhibits two independent mol-ecules per asymmetric unit. In the title compound, adjacent mol-ecules are essentially parallel along the c axis and tend to be vertical along the b axis with dihedral angles of 72.02 (6)°. However, in the reported polymorph, the entire crystal structure shows an anti-parallel arrangement of adjacent columns related by inversion centers and the two independent mol-ecules are nearly parallel with a dihedral angle of 2.48 (6)°.
Details
- Language :
- English
- ISSN :
- 1600-5368
- Volume :
- 67
- Issue :
- Pt 12
- Database :
- MEDLINE
- Journal :
- Acta crystallographica. Section E, Structure reports online
- Publication Type :
- Academic Journal
- Accession number :
- 22199760
- Full Text :
- https://doi.org/10.1107/S1600536811047039