title: Facile synthesis of zero-, one-, and two-dimensional vanadyl pyrophosphates.
abstract: Crystallization of Na(2)VOP(2)O(7) from its aqueous solution results in formation of a one-dimensional inorganic polymer {Na(2)VO(H(2)O)P(2)O(7)·7H(2)O}(n) (1). When this polymer is dehydrated at elevated temperatures this polymer undergoes a phase transition to form the two-dimensional framework β-Na(2)VOP(2)O(7), which although previously reported had been difficult to access. Exchanging lithium for sodium via ion-exchange chromatography results in formation of a discrete, cyclic, tetramer species, Li(8)[VOP(2)O(7)(H(2)O)·4H(2)O](4) (2). Isolation of crystalline β-Li(2)VOP(2)O(7) using a dehydration procedure analogous to the one employed for the sodium derivative was unsuccessful. In contrast, we show that β-K(2)VOP(2)O(7) can be obtained from the amorphous phase K(2)VOP(2)O(7)·nH(2)O (n = 0-7) upon thermal dehydration.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Diego
authors.initials: D
authors.lastname: Solis-Ibarra
authors.forename: Jared S
authors.initials: JS
authors.lastname: Silvia
authors.forename: Vojtech
authors.initials: V
authors.lastname: Jancik
authors.forename: Christopher C
authors.initials: CC
authors.lastname: Cummins
mesh_terms: D060326:Chemistry Techniques, Synthetic / Q000379:methods*; D011756:Diphosphates / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D013696:Temperature; D014639:Vanadium / Q000737:chemistry*
chemical_list: D011756:Diphosphates; D009942:Organometallic Compounds; D014639:Vanadium