A self-assembled(H_2O)_(20)(CH_3OH)_4 binary cluster containing a grail-shaped hexadecameric water cluster trapped in the cavity of a metal-ligand hybrid

摘要

A discrete centrosymmetric(H2O)20(CH3OH)4 binary cluster was confined in the cavity of a metal-ligand hybrid [Ag4(bpda)2(bpp)4·14H2O·2CH3OH] n(1)(where bpp = 1,3-bis(4-pyridyl)propane and H 2 bpda = 2,2'-biphenyldicarboxylic acid).The novel mixed water-methanol cluster consists of one grail-shaped hexadecameric cluster,four dangling water and four hanging methanol molecules.The(H 2 O) 16 cluster is composed of two pairs of edge-sharing(H2O) 5 rings attached to one(H2O) 4 core with twenty hydrogen bonds.Alternatively,the(H2O) 16 cluster is structurally similar to a complicated hydrocarbon generated by undergoing [2+2] cycloaddition of 1,2,3,4,5,6-hexahydropentalene,which reveals the resemblance between water clusters and organic compounds.