The first coordination polymer with distinct paired layers

The first coordination polymer with two distinct two-dimensional layers has been synthesized and characterized [(H2O)Cu(IN)2(BPY)Cu(IN)2] 1 (IN = isonicotinate; BPY = 4, 4′-bipyridine). The entire length of the BPY molecule with “free” nitrogen cap in Cu1 layer penetrates through the parallel neighboring Cu2 layer, with half of the BPY shown above the penetrated Cu2 layer, forming a male–female paired layer network.