Abstract
The Group I salts of 12-tungstophosphoric acid were studied in their limiting hydration state with use of both1H and 31P solid-state nuclear magnetic resonance (NMR). The bulk proton structures of the Li, Na, and Rb salts consist of both lone protons and water molecule protons. The K and Cs salts contain similar proton structures that reside in surface sites. Nonspinning 1H NMR results indicate that all protons in the limiting hydration state in each of the Group I salts are highly mobile at room temperature. 1H spin−lattice relaxation times obtained as a function of temperature indicate that the dominant mechanism responsible for proton relaxation in the Li, Na, and Rb salts is restricted rotation of water molecules while the K and Cs salts have proton spin−lattice relaxation that is dominated by translation of protons through surface sites of the material. Two stable Rb salt phases are crystallized when a stoichiometric amount of RbCl is added to aqueous 12-tungstophosphoric acid at room temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
