Synthesis, molecular structure and solution dynamics of dimeric benzamidinates containing a double diazaallyl lithium bridge. A rapid interconversion of σ and π bonds

Moris S. Eisen*, Moshe Kapon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Dimeric Li[N(SiMe3)2] reacted with the nitriles 4-XC6H4CN (X = H or Me) in diethyl ether-hexane (1:10) to yield dimeric complexes [4-XC6H4C(NSiMe3) 2·Li(NCC6H4X-4)]2 (X = H 1 or Me 2). Complex 2 is dimeric in the solid state with two four-co-ordinated lithium cations bound in a N,N′-bidentate π fashion to one amidine anion (chelating), forming a double diazaallyl lithium bridge, in a monodentate σ fashion to a nitrogen lone pair of a substrate molecule, and monodentate to a nitrogen lone pair of a second amidine anion. In solution, rapid interconversion of the different lithium-amidine bonds (σ to π and vice versa)was observed by means of the NMR chemical shifts.

Original languageEnglish
Pages (from-to)3507-3510
Number of pages4
JournalJournal of the Chemical Society. Dalton Transactions
Issue number23
DOIs
StatePublished - 1994
Externally publishedYes

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