title: Linear Chain Formation by an Oxovanadium(V) Complex of p-Methylhexahomotrioxacalix[3]arene.
abstract: The oxovanadium(V) complex 4 can be readily synthesized by the reaction of the lithium salt of p-methylhexahomotrioxacalix[3]arene trianion 3 with VOCl(3). Infrared spectra indicate a terminal V=O for complex 4 in solution and V=O.V dative interactions in the solid state consistent with the formation of a &mgr;-oxo-bridged linear chain polymer 1 (M = V, Y = O, X(3) = trianion of macrocycle 2a). Vanadium-51 NMR spectra indicate increased shielding for the linear chain polymer in the solid state compared to complex 4 in solution. Complex 4 and its linear chain polymer are proposed to have the oxovanadium group contained within the cup of the macrocycle ligand as shown in structures 5 and 7, respectively, where the cone represents macrocycle 2a.
authors.affiliation: Department of Chemistry and Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, New Mexico 87131, and Materials Aging and Reliability, Bulk Properties Department, Sandia National Laboratories, Albuquerque, New Mexico 87185.
authors.forename: Philip D.
authors.initials: PD
authors.lastname: Hampton
authors.forename: Charles E.
authors.initials: CE
authors.lastname: Daitch
authors.forename: Todd M.
authors.initials: TM
authors.lastname: Alam
authors.forename: Eugene A.
authors.initials: EA
authors.lastname: Pruss