Wide line N.M.R. study of the proton hydrates in crystallized salts : II dioxonium ion

✍ Scribed by M.H. Herzog-Cance; J. Potier; A. Potier

• Book ID: 103896630
• Publisher: Elsevier Science
• Year: 1980
• Weight: 923 KB
• Volume: 18
• Category: Article
• ISSN: 0378-4487
• DOI: 10.1016/0378-4487(80)80060-4

✦ Synopsis

Wide line N.M.R. spectra have been recorded from 90'K for the three dioxonium + salts : n50*+c104 ; H502+Br and 502 SbC16 .

From a second moment analysis in the rigid lattice, external hydrogen bonds are found significantly bent with dOH = 0.991 i for the bromide and 1.009 i for the perchlorate.

For H502+SbC16 , the first motion is a rotation of the water molecules around their bissector axis. Then a second motion which is not correlated with the previous one appears as a rotation of the water molecules around the O-O axis of the central hydrogen bond. Then a third motion either diffusionnal or isotropic reorientation appears. There is no first order phase transition.

For the perchlorate and bromide the first motion destroys the lattice (melting).