Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Synthesis and Structures of Infinite Sheet Copper(I) Complex Polymers with 2,6-Dimethylpyrazine, {[Cu2(C6H8N2)3](ClO4)2(C3H6O)2}, and with 2-Chloropyrazine, {[Cu2(C4H3N2Cl)4.5](ClO4)2}
Susumu KitagawaSatoshi KawataMitsuru KondoYouichi NozakaMegumu Munakata
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1993 Volume 66 Issue 11 Pages 3387-3392

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Abstract

The new copper(I) coordination polymers, {[Cu2(2,6-Me2pz)3](ClO4)2(C3H6O)2} (1) and {[Cu2(2-Clpz)4.5](ClO4)2} (2) (2,6–Me2pz = 2,6-dimethylpyrazine; 2–Clpz = 2-chloropyrazine) have been synthesized and their structures have been X-ray crystallographically characterized. 1 crystallizes in the monoclinic, space group P21/a with a = 15.520(5), b = 19.315(2), c = 12.493(2) Å, β = 110.82(2)°, U = 3322(2) Å3, and Z = 4. 2 is orthorhombic, space group Pbca with a = 28.567(6), b = 17.560(9), c = 11.512(9) Å, U = 5774(8) Å3, and Z = 8. These complexes show an infinite sheet structure of macrocations with uninteracting ClO4 anion. 1 shows planar sheets composed of Cu6 hexagons, in which copper atoms are three-coordinate and linked by 2,6-Me2pz molecules. Acetone molecules sit over the cavities of the Cu6 hexagons, resulting in an intercalated layer between the copper sheets. 2 provides the unique polymers having an unprecedented four coordination geometry in binary copper–pyrazine systems. There are terminal and bridging types of 2-Clpz molecules, which produce Cu6 and Cu4 motifs for infinite pleated sheets. The factors governing the mode of polymerization are found by examination of the crystal structures for a series of copper(I) polymers of pyrazine derivatives.

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© 1993 The Chemical Society of Japan
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