N,N′-bis-silylated lithium aryl amidinates: Synthesis, characterization, and the gradual transition of coordination mode from a toward Jt originated by crystal packing interactions

Sinai Aharonovich, Moshe Kapon, Mark Botoshanski, Moris S. Eisen

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

In this work nine hthium N,N′-bis(trimethylsilyl)amidinates-TMEDA complexes and the dimeric adduct of 2-ethylbenzonitrile lithium bis(trimethylsilyl)amide were synthesized and characterized. The later compound was found to be a kinetically stabilized intermediate in the amidinate formation. The solid state structures of the amidinates revealed several types of crystalline supramolecular structures, generated by the degree and nature of involvement of the amidinate π system in the intermolecular interactions. The π system was also found to play a significant role in the intramolecular bonding with the lithium atom. The π bonding is obtained at the expense of the o bond, weakening it, while keeping the metal-ligand bond length almost invariable. This facile π interaction along with the Li-N σ-bond activation can imply that similar involvements of the π systems may take place in the salt metathesis reactions with these compounds.

Original languageEnglish
Pages (from-to)1869-1877
Number of pages9
JournalOrganometallics
Volume27
Issue number8
DOIs
StatePublished - 28 Apr 2008
Externally publishedYes

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