Characterization of 2,2′-bi-(1,4,8,11-tetra-azacyclotetradecane): X-ray structure and properties of the dinuclear complex [Ni 2 (C 20 H 46 N 8 )][ClO 4 ] 4

2,2′-Bi-(1,4,8,11-tetra-azacyclotetradecane) has been isolated as a minor product from the nickel (II)-assisted synthesis of 1,4,8,11-tetra-azacyclotetradecane (cyclam) and its structure confirmed by X-ray structural analysis of the dinuclear complex [Ni2(C20H46N8)][ClO4]4.