Application of the through-bond correlation NMR experiment to the characterization of crystalline and disordered phosphates

摘要

Through-bond correlation NMR experiments have been used to characterize the structure of MP_2O_7 crystalline compounds and disordered phosphates.For MP_2O_7 materials,the refocused INADEQUATE experiment allows discrimination between the possible space group symmetries of the room temperature structure.The results show that the room temperature structure of ZrP_2O_7 adopts Pbca symmetry.For lead phosphate glasses,the refocused INADEQUATE experiment can be used to determine the P-O-P through-bond connectivities between the different types of PO4 tetrahedra.In these glasses,a correlation between the distributions of J-couplings and ~31P isotropic chemical shifts is shown by using the 2D J-resolved experiment.To cite this article:F.Fayon et al,C.R.Chimie 7(2004).