Three-dimensional copper(I) halide based coordination networks with asymmetrically substituted bridging N-donor ligands

The discrete complex [(CuI)(2) (pyzCN)(4)] (1) and the coordination polymer s (1)(infinity) [CuI(pyzCN)] (2) and (3)(infinity) [(CuX)(3) (pyzCN)(2)] (3 , 4; X = Br, Cl) may be prepared from the respective copper(I) halide CuX a nd 2-cyanopyrazine (pyzCN) by self-assembly in acetonitrile solution at 100 -120 degrees C. Whereas 2 exhibits (1)(infinity) [CuI] staircase double cha ins as its characteristic substructure, the three-dimensional networks of 3 and 4 contain single zigzag CuX strings. The influence of the copper(I) ha lide on both the connectivity pattern and the dimensionality of a resulting coordination network is particularly apparent for the 1:1 complexes (1)(in finity) [CuI(pymMe)] (5), (3)(infinity) [(CuBr)(3)(pymMe)(3)] (6) and (2)(i nfinity) [CuCl(pymMe)] (7), which were generated by reaction of CuX with 4- methylpyrimidine (pymMe) under reaction conditions similar to those above.