title: A novel sandwich-type tungstoarsenate containing a cagelike {Ca6} cluster with a water molecule enwrapped.
abstract: A cage-like {[Ca(H(2)O)](6)(H(2)O)}(12+) cluster with a water molecule enwrapped, sandwiched by two novel [As(4)W(6)O(34)](12-) fragments, has been obtained, and the extension of these clusters from molecules into a 2-D layer occurs through [Ca(H(2)O)(5)](2+) linkers, which represents the first heteropolyoxoanion (HPA) constituted by [As(4)W(6)O(34)](12-) and the unprecedented high nuclearity {[Ca(H(2)O)](6)(H(2)O)}(12+) cluster.
authors.affiliation: Polyoxometalates Chemistry Key Laboratory of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P.R. China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Ma
authors.forename: Pengtao
authors.initials: P
authors.lastname: Ma
authors.forename: Dongdi
authors.initials: D
authors.lastname: Zhang
authors.forename: Jiai
authors.initials: J
authors.lastname: Hua
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Tengfei
authors.initials: T
authors.lastname: Huang
authors.forename: Jingping
authors.initials: J
authors.lastname: Wang
authors.forename: Jingyang
authors.initials: J
authors.lastname: Niu