A TETRAGONAL FORM OF TETRA(2-PYRIDYL)PYRAZINE (TPPZ)

被引：26

作者：

GREAVES, B

STOECKLIEVANS, H

机构：

来源：

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 1992年 / 48卷

关键词：

D O I：

10.1107/S0108270192009387

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The tetragonal form of 2,3,5,6-tetra(2-pyridyl)pyrazine (TPPZ-I) possesses C(i) symmetry. The pyridine rings A and B are inclined toward the pyrazine ring by 59.0(1) and 46.4(1)-degrees, respectively, and toward one another by 60.4(1)-degrees. The shortest intramolecular distance is that between the pyrazine N(1) and the pyridine N(2) atoms [2.907(3) angstrom], while distance N(3) ... C(4a) is 3.297(4) angstrom. Pyridine rings A and A' have been rotated by more than 180-degrees with respect to the orientation observed in the monoclinic form, TPPZ-II, which also possesses C(i) symmetry. Both molecules have planar pyrazine rings.

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页码：2269 / 2271

页数：3

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