Amine electronic structure

It is well-established that the molecular and electronic structures of metal complexes of azamacrocycles are greatly affected upon N-alkylation (197). This is mainly due to two factors (a) the decrease of the ligand field strength and (b) the increase in the steric requirements upon going from a secondary to a tertiary amine donor function (251). To examine whether the properties of the dinuclear amine-thiophenolate complexes are affected by the N-alkyl substituents, analogous complexes of the... 

The parent compound of all amines, ammonia, has a pyramidal structure with N—H bond lengths of 101.5 pm and H—N—H bond angles of 106.6°. The electronic structure of the ground state may be represented as... 

Steinfeld, G. and Kersting, B. (2000) Characterisation of a triply thiolate-bridged Ni-Fe amine-thiolate complex Insights into the electronic structure of the active site of [NiFe] hydrogenase. Chem. Commun., 2000, 205-6. 

Contrary to amines, some structural variations of the diglycidyl ethers of bisphenols, such as the position of the glycidyl groups in the aromatic ring or the presence of either electron-donor or electron-acceptor substituents, have little effect on their reactivity with amines 103 -105>. o-Diglycidyl ethers the rate constant of which is higher by a factor of 5 than that of m- and p-isomers are an exception 104). These data are presented in Tables 7 and 8. 

Aromatic amines are not the only type of molecule to undergo a spontaneous twist in the excited state, but DMABN is the best-studied example. Other such compounds are stilbene-type molecules, where the double bond twists in the excited state. The electronic structure for both cases, twisting double bonds and twisting single or partly double bonds of 7r-donor linked to 7r-acceptor (TICT molecules), can be related to each other and characterized in the framework of quantum-chemical treatment as described in Section III. 

A carbanion has a trivalent carbon atom that bears a negative charge. There are eight electrons around the carbon atom (three bonds and one lone pair), so it is not electron deficient rather, it is electron rich and a strong nucleophile (Lewis base). A carbanion has the same electronic structure as an amine. Compare the structures of a methyl carbanion and ammonia ... 

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