Pseudoreorientation of the SiF5− ion in tetraphenylphosphonium silicon pentafluoride

Autor:	S Froneman, E.C Reynhardt
Rok vydání:	1988
Předmět:	Crystallography Trigonal bipyramidal molecular geometry Proton Chemistry Stereochemistry Relaxation (NMR) General Engineering Spin–lattice relaxation Second moment of area Pseudorotation Square pyramidal molecular geometry Ion
Zdroj:	Journal of Magnetic Resonance (1969). 80:268-279
ISSN:	0022-2364
DOI:	10.1016/0022-2364(88)90296-x
Popis:	T 1 , T 1 ϱ and the second moment of the 19 F nuclei in (C 6 H 5 ) 4 PSiF 5 have been measured as a function of temperature. Efforts to explain the relaxation results in terms of reorientations about the symmetry axes of either the square pyramidal or the trigonal bipyramidal molecular structures have been unsuccessful. A model in which the trigonal bipyramidal structure executes an internal pseudoreorientation as well as reorientations about the twofold and the threefold axes yields satisfactory agreement with the experimentally obtained relaxation results. Proton T 1 measurements reveal twofold reorientations of C 6 H 5 rings at higher temperatures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3fb4e09a51e06e3e0ccde062310e6dcc https://doi.org/10.1016/0022-2364(88)90296-x Zobrazit plný text záznamu