The Crystal and Molecular Structure of 2,5-Distyrylpyrazine

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概要

• 論文の詳細を見る

• 2,5-Distyrylpyrazine(C<SUB>20</SUB>H<SUB>16</SUB>N<SUB>2</SUB>), which has photo-polymerizability in the crystalline state, crystallizes in the orthorhombic system with cell dimensions of <I>a</I>=20.638, <I>b</I>=9.599, and <I>c</I>=7.655 Å, including four molecules in the unit cell. The space group is <I>Pbca</I>. The structure has been determined by the direct method and refined by the block-diagonal-matrix least-squares method using three-dimensional data. The molecules is not planar; the average plane of the pyrazine ring makes a dihedral angle of 12.09° with that of the benzene ring. The molecules are spaced by the <I>c</I>-translation forming an almost parallel plane-to-plane stack. In this stack, the ethylenic double bonds approach each other at the shortest intermolecular distances of 3.939 Å, since the long axis of the molecule makes an angle of about 30° with the <I>c</I>-axis. Therefore, the polymerization may occur between these double bonds to form a cyclobutane ring.

• 公益社団法人 日本化学会の論文

著者

• NAKANISHI Hachiro

  Research Institute for Polymers and Textiles

• Hasegawa Masaki

  Research Laboratory Of Engineering Materials Tokyo Institute Of Technology:(present Address)producti

• Sasada Yoshio

  Laboratory of Chemistry for Natural Products, Faculty of Science, Tokyo Institute of Technology

• Shimanouchi Hirotaka

  Laboratory of Chemistry for Natural Products, Tokyo Institute of Technology

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