title: Introducing organosilicone source into the synthetic system of polyoxovanadates: two novel {V15Si6O48}-based extended chains.
abstract: Two novel extended chains based on rare {V(IV)(15)Si(6)O(48)} have been prepared under hydrothermal conditions by introducing an organosilicone source into the synthetic system of the polyoxovanadates. Single-crystal X-ray diffraction analyses show that the neighboring {V(IV)(15)Si(6)O(48)} clusters are linked by a pair of V(V)O(2) fragments via the coordination bonds of (Si-)O-V-O(-Si) to give rise to a zig-zag chain in compound 1, which is the first example of V(iv,v) mixed valence states successfully synthesized in {V(15)Si(6)O(48)}-containing POMs. While in 2 the linkages are changed to [Co(pdn)(2)(H(2)O)](2+) (pdn = 1,3-propanediamine) cations instead of {V(V)O(2)} fragments, to generate another comparable 1-D infinite chain, which demonstrates the first organic-inorganic vanadosilicon hybrid linked by a second transition-metal complex. The possible hydrolysis mechanism of tetraethyl orthosilicate as the Si source is postulated to afford a feasible protocol to synthesize a new type of vanadosilicate cluster. The magnetic properties of the two compounds have also been investigated.
authors: School of Chemistry, Beijing Institute of Technology and Key Laboratory of Cluster Science, Ministry of Education of China, Beijing 100081, PR China.
authors: Yuanzhe
authors: Y
authors: Gao
authors: Yanqing
authors: Y
authors: Xu
authors: Yu
authors: Y
authors: Cao
authors: Changwen
authors: C
authors: Hu
mesh_terms: D018360:Crystallography, X-Ray; D008280:Magnetics; D008958:Models, Molecular; D008968:Molecular Conformation; D017646:Organosilicon Compounds / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D013055:Spectrophotometry, Infrared; D013696:Temperature; D014638:Vanadates / Q000138:chemical synthesis* / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017646:Organosilicon Compounds; D014638:Vanadates