A noncentrosymmetric 3D coordination polymer of metallocalix[4]arene

Abstract

Sequential reaction of a lower-rim functionalized calix[4]arene, 25,27-bis(hydroxycarbonylmethoxy)-26,28-dimethoxy-p-tert-butylcalix[4]arene (H 2L C4), with K 2CO 3 and CoCl 2·6H 2O in ethanol afforded a 3D coordination polymer [K 3Co 2(L C4) 3(EtOH) 6]Cl (1). X-ray crystal analysis revealed that 1 features a noninterpenetrated (10,3)-a net structure wherein octahedral Co 2+ ions serve as the three-connecting nodes and [K(L C4)] - units function as the bridges between the Co 2+ 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(L C4)] - unit. © 2008 American Chemical Society.