Self-Assembly of Goldberg Polyhedra from a Concave [WV_5O_(11)(RCO_2)5(SO_4)]~(3-) Building Block with 5-Fold Symmetry

摘要

Nanoscale regular polyhedra with icosahe-dral symmetry exist naturally as exemplified by virus capsids and fullerenes. Nevertheless, their generation by supramolecular chemistry through the linking of 5-fold symmetry vertices remains unmet because of the absence of 5-fold symmetry building blocks with the requisite geometric features. This situation contrasts with that of tetrahedral and octahedral symmetry metal-organic polyhedra (MOPs), for which appropriate triangular and square molecular building blocks (MBBs) that can serve as vertices or faces are readily available. Herein, we report isolation of a pentagonal [WV5O11(SO4)(6)](8-) cluster and reveal its utility to afford the first four examples of nanoscale Goldberg MOPs, based upon 5-fold MBBs. Two 32-faced G(v)(1,1) MOPs and two 42-faced G(v)(2,0) MOPs were formed using linear or triangular organic ligands, respectively. The largest Goldberg MOP-4, exhibits a diameter of 4.3 nm, can trap fullerene C-60 molecules in its interstitial cavities.