M. Sekizaki
1981
Citations
0
Influential Citations
9
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
Bis(perchlorato)bis(pyrazine-2,3-dicarboxamide)copper(II) has been prepared, and its crystal and molecular structure has been determined by the X-ray diffraction and the infrared spectroscopic methods. The crystals are triclinic with a space group P\bar1; a=10.959(4), b=6.970(3), c=7.666(3) A, α=116.63(3), β=78.14(5), and γ=97.27(5)°, and Z=1. The refinement of the crystal structure has been carried out by a block-diagonal least-squares method to give R=0.054 for 1727 non-zero reflections. The complex is centrosymmetric, with the two bidentate ligand molecules chelating to the copper atom in trans positions through the amide oxygen and pyrazine nitrogen atoms to form a square-plane. The two perchlorate ions coordinate weakly to the copper atom through the oxygen atoms from the top and bottom of this plane; thus, an elongated octahedron is formed. The complex molecules are connected to one another by N–O type hydrogen bonds to form a three-dimensional network. The infrared spectrum has been compared with t...