A Novel 3D-Supramolecular Coordination Polymer Based on CuCN, Ph3Sn Cation and Quinoxaline

Reaction of Ph 3 SnCl and K 3 [Cu(CN) 4 ] with quinoxaline (qox) at room temperature affords the novel 3D-supramolecular coordination polymer (SCP) ∞ 3 [Cu 2 (CN) 4 ·(Ph 3 Sn) 2 ·qox], I , as the first example of the organotin-CuCN SCP containing the Ph 3 Sn fragment. The structure of I displays two Cu(CN) 2 building blocks connected by a Ph 3 Sn cation and qox ligand creating the rhombic [Cu 2 (μ-CN) 2 ] motif. The structure of I contains three different fused rings, the minicycle [Cu 2 (μ-CN) 2 ], the 18-atomic [Cu 4 (Ph 3 Sn) 2 (CN) 4 (qox) 2 ], and the 24-atomic [C 8 N 8 Cu 4 (Ph 3 Sn) 4 ] rings, which create a non-interpenetrating 3D-network. These rings form a box-like structure with cavities suitable to accommodate bulky phenyl groups. SCP I belongs to the rapidly growing family of supramolecular assemblies containing the quite unusual [Cu 2 (μ-CN) 2 ] motif, the repeated appearance of which raises the question whether cuprophilic interactions therein are the basic cause of the existence of I .