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Orbital imaging of the “lone pair” electrons in N(CH3)3, NH3and NF3 by electron momentum spectroscopy

✍ Scribed by A.O. Bawagan; C.E. Brion

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 461 KB
Volume: 137
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80632-2

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✦ Synopsis

The electron density in each of the outermost MOs of N( CH3)3 and NFS, as measured by electron momentum spectroscopy, is found to exhibit a very much higher degree of s character than the corresponding orbital in NHj. This behaviour is clearly predicted by MO calculations which indicate appreciable delocalization of electron density away from the nitrogen in N(CHX)X and NF,. The observed results for N(CH3)3 are contrary to predictions based on commonly used intuitive arguments involving lone pairs, molecular geometry and hybridized orbitals. The present work is supportive of the view that CH, groups are intrinsically more electron attracting than H when bonded to N.

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