In the structure of the title compound, [CuBr(C6H8N2)](n), each Cu2+ cation
is surrounded by two 2,3-dimethylpyrazine ligands and two Br- anions in a
distorted tetrahedral arrangement. The Cu2+ cations and Br- anions form (Cu
2Br2)(2) rhomboid dimers located around a centre of inversion. The 2,3-dime
thylpyrazine ligands connect the Cu2+ cations in the dimers into sheets par
allel to (010).