Organoaluminum and ‐gallium Formamidinate Complexes. Issue 13 (8th March 2013)

• Record Type: Journal Article
• Authors: Hamidi, Shima; Dietrich, H. Martin; Werner, Daniel; Jende, Lars N.; Maichle‐Mössmer, Cäcilia; Törnroos, Karl W.; Deacon, Glen B.; Junk, Peter C.; Anwander, Reiner
• Is Part Of: European journal of inorganic chemistry. Issue 13(2013)
• Page Start: 2460
• Page End: 2466
• Publication Date: 2013-03-08
• Subjects: Aluminum -- Gallium -- X‐ray diffraction -- Formamidines -- Bridging ligands; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201201515
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: Dialuminum formamidinate complexes [Me2 Al(μ‐Form)(μ‐Me)AlMe2 ] [Form (ArNCHNAr) = EtForm (Ar = 2, 6‐Et2 C6 H3 ) or DippForm (Ar = 2, 6‐ i Pr2 C6 H3 )] were obtained in good yields by treatment of formamidines (FormH) with trimethylaluminum in a 1:3 stoichiometry. The products contain both a bridging Form ligand and a bridging methyl group between the two aluminum centers. [M(Form)Me2 ] (M = Al, Form = DippForm, EtForm; M = Ga, Form = DippForm) were prepared in high yields by the protonolysis reactions of MMe3 (M = Al, Ga) with formamidines (FormH) in a 1:1 stoichiometry. [Al(DippForm)Me2 ] was also synthesized by other methods including concentration of the tetrahydrofuran/ n ‐hexane solution of [Me2 Al(μ‐DippForm)(μ‐Me)AlMe2 ] to dryness and also by reaction of AlMe3 with [Ga(DippForm)Me2 ] in a 1:1 ratio. Partial dissociation of the dialuminum to monoaluminum complexes was detected in the 1 H NMR spectra of [Me2 Al(μ‐Form)(μ‐Me)AlMe2 ] complexes. All complexes exhibit a distorted tetrahedral stereochemistry of the Group 13 metal atoms. Abstract : Equimolar protonolysis reactions of MMe3 (M = Al, Ga) with formamidines (FormH) afford monometallic complexes [M(Form)Me2 ]. The addition of excess amounts of MMe3 produces dimetallic [Me2 M(μ‐Form)(μ‐Me)MMe2 ] for aluminum only.