What do you understand by electron deficient and electron precise compounds of hydrogen?
Answers
It is a kind of molecular/covalent hydride. Electron precise compounds form from group 14 (C, Si, Ge) atoms and have just enough electrons so as to form normal covalent bonds.
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As far as I know, the Lewis structure of SF4, which is a very nasty molecule, is electron precise.
The electron pairs around sulfur in SF4 adopt a trigonal planar geometry to give a see-sawmolecular geometry in which axial and equatorial fluoride ligands have a soft mechanism of exchange by pseudorotation.
The singlet observed in the room temperature 19F NMR spectrum of the molecule reflects this exchange, however, these can be frozen out at lower temperature.
Explanation:
(i) Electron-deficient compounds of hydrogen: - The hydrides of some compounds are deficient of electrons as these elements like gp 13 elements do not have enough electrons. Examples are BH3 and AlH3 . . ... The electrons are Precise and hence they are called as electron- precise compounds of hydrogen.