A 2-DIMENSIONAL COPPER(I) POLYMER CONTAINING BOTH MOLECULAR ROD AND ANIONIC BRIDGES - SYNTHESIS AND CRYSTAL-STRUCTURE OF (MU-CHLORO)(MU-PYRAZINE)COPPER(I)

The crystal structure of bright-red crystals of the bidimensional poly nuclear diamagnetic (mu-chloro)(mu-pyrazine)copper(I) complex has been analyzed from X-ray diffraction data. The structure was solved by the heavy-atom method. Full-matrix least-squares refinement based on 673 reflections with F > 4 sigma(F) converged to a final R = 0.043 and R(w ) = 0.048. Crystals of this complex are monoclinic, space group P2/c, a = 3.814(1), b = 6.356(1) and c = 11.497(5) Angstrom; beta = 96.04(2) degrees, Z = 2. The structure consists of planes of copper(I) atoms li nked by pyrazine and Cl- bridges, each Cu(I) being in a distorted tetr ahedral environment formed by two chloride ions and two nitrogen atoms belonging to two pyrazine molecules, with bond distances of Cu-Cl = 2 .349(1) and Cu-N = 2.038(4) Angstrom. Vibrational and electronic spect roscopy of the title compound is also reported.