A Noncentrosymmetric 3D Coordination Polymer of Metallocalix[4]arene

Sequential reaction of a lower-rim functionalized calix[4]arene, 25,27-bis(hydroxycarbonylmethoxy)-26,28-dimethoxy-p-tert-butylcalix[4]arene (H2LC4), with K2CO3 and CoCl2·6H2O in ethanol afforded a 3D coordination polymer [K3Co2(LC4)3(EtOH)6]Cl (1). X-ray crystal analysis revealed that 1 features a noninterpenetrated (10,3)-a net structure wherein octahedral Co2+ ions serve as the three-connecting nodes and [K(LC4)]− units function as the bridges between the Co2+ ions. The calixarene ligands in 1 adopt a 1,3-alternate conformation, and there are considerable cation−π interactions between the K+ ion and the phenyl rings within each [K(LC4)]− unit.