Solid State Coordination Chemistry of the Copper Halide- and Pseudo-Halide-Organoamine System, Cu-X-[(bis-2,3-(2-pyridyl)pyrazine)] (X = Cl, Br, CN): Hydrothermal Synthesis and Structural Characterization

The compounds [Cu3Cl3(bipypy)] (1), [CuBr(bipypy)]2 (2), [Cu2Br2(bipypy)] (3), and [Cu3(CN)3(bipypy)] (4)
were prepared from mixtures of the copper halide salts and the ligand bis-2,3-(2-pyridyl)pyrazine (bipypy) in
hydrothermal media. The series of compounds includes molecular, one- and two-dimensional species and
demonstrates a trend in increasing complexity. The synthetic conditions, methods of structural characterization
and descriptions of the structures of compounds 1−4 are presented. Crystal data for C14H10Cl3Cu3N4 (1),
orthorhombic, Pna21, a = 18.6778(5) Å, b = 5.1046(2) Å, c = 16.6257(2) Å, Z = 4; for C28H20Br2Cu2N8O2 (2),
triclinic, P1̄, a = 7.795(1) Å, b = 8.857(1) Å, c = 11.1268(2) Å, α = 72.2(1)°, β = 83.050(1)°, γ = 73.832(1)°,
Z = 1; for C14H10Br2Cu2N4 (3), monoclinic C2/c, a = 10.884(2) Å, b =16.713(4) Å, c = 9.307(2) Å, β =
113.199(5)°, Z = 4; and for C17H10Cu3N7 (4), monoclinic, P21/n, a = 12.8549(2) Å, b = 9.0875(1) Å, c =
16.0023(2) Å, Z = 4.