Coordination polymers of copper(II) and copper(I) trifluoroacetates with pyrazine

New coordination polymers of copper(II) and copper(I), [Cu(tfa)(2)(pyz)(2)] (n) (Htfa = trifluoroacetic acid, pyz = pyrazine) (1), [Cu-2(tfa)(2)(CH3O)( 2)-(pyz)(2)](n) (2), and [Cu-2(tfa)(2)(Pyz)(3)](n) (3), have been synthesiz ed and characterized structurally. The crystal structure of 2 consists of m ethoxo-bridged dinuclear copper(II) units which are connected by pyrazine m olecules to form a two-dimensional network. The crystal structure of 3 show s a two-dimensional net-like structure, where each copper(I) atom has a dis torted tetrahedral arrangement. The magnetic property of 2 is antiferromagn etic.