Assembly of chiral two- and three-dimensional copper(I) pseudohalide basedcoordination polymers with asymmetrically substituted pyrazine and pyrimidine ligands

The coordination polymers (2)(proportional to)[(CuCN)(2)(mu-2 Mepyz)], (3)( infinity)[CuCN(mu-2 Mepyz)] and (3)(infinity)[CuCN(mu-4 Mepym)] (1-3) (2 Me pyz = 2-methylpyrazine; 4Mepym = 4-methylpyrimidine) may be prepared by sel f-assembly in acetonitrile solution at 100 degrees C (1, 3) or without solv ent at 20 degrees C (2). All three contain (1)(infinity)[CuCN] chains that are bridged by the bidentate aromatic ligands into sheets in 1 and 3D frame works in 2 and 3. Reaction of CuSCN with these heterocyclic diazines at 100 degrees C leads to formation of the lamellar coordination polymers (2)(inf inity)[(CuSCN)(mu-2 Mepyz)] (4) and (2)(infinity)[CuSCN .(4Mepym-kappa N1)] (5), which contain respectively (1)(infinity)[CuSCN] chains and Irans-tran s fused 2,[CuSCN] sheets as substructures. The presence of an asymmetric su bstitution pattern in 2 Mepyz and 4 Mepym induces the adoption of a chiral structure by 2 and 5 (space groups P2(1)2(1)2(1) and P1).