Dimerisation versus polymerisation: Affects of donor position in isomeric dilithium diamine-bis(phenolate) complexes
作者:Francesca M. Kerton、Christopher M. Kozak、Karsten Lüttgen、Charlotte E. Willans、Robert J. Webster、Adrian C. Whitwood
DOI:10.1016/j.ica.2005.11.013
日期:2006.6
The synthesis and structures of isomeric lithium diamine-bis(phenolate) complexes are reported. Deprotonation of the ligands, H2O2NN'tBu [Me2NCH2CH2N(CH2ArOH)(2), Ar = 3,5-C6H2-Bu-t(2)] and H2O2N2tBu [HOArCH2NMeCH2CH2NMeCH2ArOH, Ar = 3,5-C6H2-Bu-t(2)] in diethyl ether affords base-free lithium complexes Li2O2NN'tBu (1) and Li2O2N2tBu (2) upon solvent removal. The dioxane adduct of (1) exhibits a polymeric structure in the solid-state, whereas the dioxane adduct of (2) possesses a dimeric structure. The syntheses of K2O2NN'tBu (3), K2O2N2tBu (4), Zr(O2NN'(tBu))Cl-2 (5) and Y(O2NN'(tBu))Cl(THF), (6), are also reported. The transition metal complexes were isolated in good yields via salt metathesis reactions using 1 or 3. (c) 2005 Elsevier B.V. All rights reserved.