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Schiff-base -Ate Derivatives with Main Group Metals: Generation of a Tripodal Aluminate Metalloligand

Abstract

New heterobimetallic aluminates with well-defined structures bearing bidentate Schiff bases as ligands have been prepared. The ligands studied are PhO-CH=N-Ar (Ar = C6H5 (La), 2,6-iPr-C6H3 (Lb)), with and without donor substituents in ortho position of the arene ring bonded to the iminic nitrogen. To prepare the heterometallic species, the proligands HL were treated with the appropriated alkali metal precursor and then AlMe3 was added. In these reactions the alkali metal size has a substantial influence in the outcome. For lithium, the formation of [LiAlMe3(L)]2 1a-b compounds was straightforward and their nuclearity in the solid state was confirmed by an X-Ray study for 1a. When moving to sodium, the analogous species [NaAlMe3(L)]n initially formed, quickly evolves to [NaAlMe2(L)2]n (3a-b) in solution. As well, for potassium, the initial derivatives [MAlMe3L] progress very rapidly to the generation of [KAlMe2L2] as evidenced from the isolation of [KAlMe2(Lb)2] 4b as a crystalline product. Furthermore, for potassium the unique species [KAlMe(Lb)3] 5b was isolated which shows, as a striking feature, the presence of a unusual tripodal metalloligand.

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Publication details

The article was received on 04 Mar 2018, accepted on 05 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00835C
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Schiff-base -Ate Derivatives with Main Group Metals: Generation of a Tripodal Aluminate Metalloligand

    M. E. G. Mosquera, V. Tabernero, F. M. García-Valle, J. Cano and T. Cuenca, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00835C

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