Abstract
AbstractThis paper reports a productive discussion of bonding principles in the non-metallic 2nd row hydrides. It suggests the inversion of a bonding character, potentially from hydrides of B & C, which may display unsaturation and electronic deficiency accompanied by electronic delocalization in 1D or 2D or 3D. Contrasted with the opposite possibility, within the finite number of hydrides of N, O and F, that display apparently extensive H-bonding and subsequently proton delocalization in 1D and 2D (in HF & ice polymorphs, respectively), and now potentially in 3D in a corresponding hydride of N called Rice's blue material, or perhaps polyimidogen. Where polyimidogen is a crystalline NH lattice that is a polymorph of the ammonium azide structure-type thus.
Highlights
Resonance and the Infinite Hydrides of B & CI have had thoughts on the hydrides possible for B, C, N, O & F, and for N there seems to be some interesting undiscovered possibilities
(3), the hydrides of nitrogen appear to be very few in number, as in 6 distinct structures, in contrast to B and C, and perhaps they are : the spectroscopic radical imidogen (NH), the room temperature liquid ammonia, the room temperature liquid hydrazine, the crystalline, non-metallic salt ammonium azide, the spectroscopic species diazene (HN=NH), and perhaps the uncharacterized and intriguing low-temperature condensed phase hydronitrogen, discovered by F.O.Rice in the 1950's, called Rice's blue material with a deep blue coloration and the formula (NH)
It is my belief that imidogen (NH) is a spectroscopic oddity that has been characterized as a diatomic radical while ammonia isa Lewis octet species, perhaps comprised of covalent, electron-pair, 2-center bonds, and the molecule can be described by Pauling's VB theory and Mulliken's MO theory, and the same is true of hydrazine, and these two liquids will freeze and give probably polymorphic crystalline patterns with interesting H-bonding possibly
Summary
I have had thoughts on the hydrides possible for B, C, N, O & F, and for N there seems to be some interesting undiscovered possibilities. I am aware of: (1) the hydrides of B have been investigated & elucidated by Stock et al and Lipscomb et al & I have tried to read this literature, but I am not able to get a reliable source, and I understand that the hydrides of B differ from those of C, N, O and F in that they exhibit in some cases exceptions to covalent, electron-pair, 2center bonds, in the form of electron deficient, 3-center bonds, and that there are innumerable hydrides of B, like the innumerable hydrides of C, which in some cases display resonance effects in their hydroboron structures as suggested by Pauling et al, and (2) the hydrides of C are innumerable and they universally possess Lewis octet, covalent, electronpair, 2-center bonds, with rare exceptions in which a hydrocarbon has perhaps C atoms in strained geometries which may possess coordination numbers different than 3 or 4, they are successfully described by Pauling's VB theory and Mulliken's MO theory, and some hydrocarbons display classical quantum mechanical resonance effects as predicted by Pauling et al including the archetypal system benzene
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