Ammonia orbital overlapping

Describe the bonding in ammonia assuming sp hybridization of nitrogen In what kind of orbital is the unshared pair What orbital overlaps are involved in the N—H bonds , ... 

Cyclopropyl ketones (29) behave as weakly conjugated compounds, with significant orbital overlap between one ty-bond (or sometimes two) of the cyclopropane ring and the jr-orbital of the carbonyl group (p. 242). The three-membered ring is reduced by lithium in liquid ammonia, with rupture of whichever cr-bond most effectively overlaps the carbonyl tt-orbital [280]. The reduction probably involves transfer of an electron to the jS -carbon atom of this cr-bond, so that conjugative overlap can be maintained during a smooth transition to the species (30) which is both a carbanion and a resonance-stabilised enolate radical. A second electron trans-... 

In ammonia, nitrogen resembles the carbon of methane. Nitrogen is sp -hybridized, but (Table 1.1) has only three unpaired electrons they occupy three of the sp orbitals. Overlap of each of these orbitals with the s orbital of a hydrogen atom results in ammonia (Fig. 1.12). The fourth sp orbital of nitrogen contains a pair of electrons. 

Orbital overlap models of methane, ammonia, and water. 

Ammonia differs from phosphine in that the polarity of the N—H bond results in transition metal than amines with 2s and 2p, a point which was argued by Epshtein et al. 11 years ago.232... 

The ammonia molecule owes its capacity as a ligand to the lone-pair orbital on the N atom. In the language of VB theory (which is of limited value in d block and f block chemistry), the bond simply involves the o overlap of the lone-pair orbital with an empty hybrid orbital of the central atom. In MO language, a complex ion M(NH3)"+ has m filled a bonding MOs. There is no reason to suspect that any other orbitals on the NH3 molecule are involved in its bonding to a central atom in a complex. 

The unshared electron pair in ammonia ( NH3) occupies an. (//-hybridized orbital of nitrogen. Each N—H bond corresponds to overlap of a half-filled sp3 hybrid orbital of nitrogen and a l.v orbital of hydrogen. 

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