Abstract
A powerful tool for structural assignments in high-resolution 31P solid-state NMR is provided by double-quantum NMR excitation spectroscopy. Based on the strength of 31P–31P homodipolar couplings, this method distinguishes between isolated PS43−, P2S74−, and P2S64− units present in various prototype crystalline compounds. This approach was used to show that the crystallization of vitreous Li4P2S7 electrolyte proceeds with fundamental bond reorganization as sketched below.
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