Introducing organosilicone source into the synthetic system of polyoxovanadates: two novel {V15Si6O48}-based extended chains†
Abstract
Two novel extended chains based on rare {VIV15Si6O48} 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 {VIV15Si6O48} clusters are linked by a pair of VVO2 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 {V15Si6O48}-containing POMs. While in 2 the linkages are changed to [Co(pdn)2(H2O)]2+ (pdn =