Tris(organotin)tungstogermanate, a Sandwich Organometallic Derivative of a Keggin-Type Polyoxometalate: Synthesis and DFT Study

resumo

A phenyltin-containing Keggin-based polyoxometalate has been synthesised and characterised by elemental analysis, infrared and electronic spectroscopy, and multinuclear NMR spectroscopy. Structural data, complemented by DFT calculations, suggests that three phenyltin groups connect two [-GeW9O34]10 moieties to form the [(C6H5SnOH)3(-GeW9O34)2]14 anion. Each tin atom displays a distorted-octahedral environment, composed of two sets of equatorial oxygen atoms from two edge-sharing WO6 octahedra of each [-GeW9O34]10 group, and one phenyl and one OH group in the axial positions. The DFT studies lend support to the experimental proposal of the molecular structure of this polyoxometalate. The similar energy of the limiting arrangements of phenyl groups demonstrates how their fluxionality occurs as a dynamical process in solution and explains the disorder in the solid.

palavras-chave

MULTIPLE ORGANIC GROUPS; TUNGSTOSILICATES; APPROXIMATION; CHEMISTRY; GRADIENT; SOLVENTS; ENERGY; DAWSON

categoria

Chemistry

autores

Liu, HZ; Bandeira, NAG; Felix, V; Calhorda, MJ

nossos autores

agradecimentos

H. L. thanks Praxis XXI for a postdoctoral grant. We thank Fundacao para a Ciencia e Tecnologia, Portugal, for financial support (PEst-OE/QUI/UI0612/2011). N. A. G. B. acknowledges PTDC/QUI-QUI/113678/2009 for a grant.

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".