Insertion reactions of β-diketiminate-stabilised calcium amides with 1,3-dialkylcarbodiimides

Anthony G.M. Barrett, Mark R. Crimmin, Michael S. Hill, Peter B. Hitchcock, Panayiotis A. Procopiou

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

A series of heteroleptic β-diketiminate-stabilised calcium amides of the form [{ArNC(Me)CHC(Me)NAr}Ca{NR1R2}(THF)] (Ar = 2,6-diisopropylphenyl; R1 = H, R2 = Ar; R1 = H, R2 = CH2CH2OMe; R1 = R2 = Ph) react with 1,3-dialkylcarbodiimides, R3N=C=NR3 (R3 = Cy, iPr), to yield the corresponding insertion products [{ArNC(Me)CHC(Me)NAr}Ca{(R3N)2CNR 1R2}(THF)] at room temperature in hydrocarbon solutions. These latter compounds contain both β-diketiminate and guanidinate ligands bound to calcium. Solid-state data are consistent with the guanidinate ligands adopting a number of binding modes including κ2 through κ3 coordination, with varying degrees of delocalisation of the non-bound guanidinate nitrogen lone-pair across the π-framework of the ligand. DFT computational studies have been conducted to address these variations in coordination behaviour.

Original languageEnglish
Pages (from-to)4474-4481
Number of pages8
JournalDalton Transactions
Issue number33
DOIs
Publication statusPublished - 20 Aug 2008

ASJC Scopus subject areas

  • Inorganic Chemistry

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