Robert T. Butcher, Christopher P. Landee, and Mark M. Turnbull. Clark University, Worcester, MA
The reaction of CuX2 (X = Cl, Br) with a variety of pyrazine derivatives (L) leads to formation of the complexes Cu(L)X2. The compounds crystallize as pairs of L-bridged chains linked in pairs by bihalide bridges generating the rails and rungs of a ladder motif, respectively. The compounds have been characterized by X-ray diffraction and variable temperature magnetic susceptibility measurements. Magnetic susceptibility measurements (1.8-325 K) show significant antiferromagnetic interactions and the presence of a singlet ground state, in agreement with the ladder structure. The synthesis, structures and magnetic data will be presented for L = quinoxaline, 2,3-dimethylpyrazine and 2-methylpyrazine.