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- W187908552 abstract "This chapter discusses the geometry of amines and ammonium compounds. In ammonia, four hybrid sp 3 orbitals are directed towards the corners of a tetrahedron. The ammonia molecule is pyramidal in shape, with the nitrogen atom at the apex of the pyramid and the three hydrogen atoms at the corners of a triangular base. The lone pair on nitrogen is tetrahedrally disposed towards the fourth corner of a notional tetrahedron. Calculation gives a bond angle of 107°, which is somewhat different from the perfect tetrahedral angle of 109° 28'. It is believed that the lone pair has a larger spatial requirement than a hydrogen atom and thus causes a slight compression of the bond angles. Also contributing to the compression of the angles is the repulsion exerted on the bonding pairs by the lone pair on nitrogen. The X-ray crystallographic work on tetra-alkylammonium halides show that the four alkyl groups are tetrahedrally disposed about the nitrogen atom. The experimental result is in accord with the calculations of quantum chemistry for the expected tetrahedral geometry for sp 3 hybridization in ammonium and substituted ammonium ions." @default.
- W187908552 created "2016-06-24" @default.
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- W187908552 date "1967-01-01" @default.
- W187908552 modified "2023-09-27" @default.
- W187908552 title "GEOMETRY OF AMINES AND AMMONIUM COMPOUNDS" @default.
- W187908552 doi "https://doi.org/10.1016/b978-0-08-011913-7.50008-2" @default.
- W187908552 hasPublicationYear "1967" @default.
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