title: Formazanido complexes of heavier group 13 elements aluminium, gallium, and indium.
abstract: The preparation, molecular structures and physical properties of novel heavy group 13 metal formazanido complexes are described. The trimethyl derivatives MMe3 (M = Al, Ga, In) react with 1,3,5-triphenylformazan (Htpf) in a 1 : 1 ratio to give methane and metallacycles of the type [M(tpf)Me2]. While [Al(tpf)Me2] and [Ga(tpf)Me2] are mononuclear compounds with six-membered rings and coordination number 4 in solution and in the crystalline state, indium derivative [In(tpf)Me2] forms oligomers in non-coordinating solvents according to NMR studies, these are probably N-bridged dimers with coordination number 5 at indium. The oligomer is cleaved by addition of one equivalent of pyridine or 4-dimethylaminopyridine (DMAP). The complexes [M(tpf)Me2] (M = Al, Ga) and [In(tpf)Me2(DMAP)] are characterized by XRD analyses. They are unique examples of main group metal formazane ring systems of the third and higher periods. The UV-Vis solution spectra of the neutral ligand Htpf and its metallated compounds [M(tpf)Me2] (M = Al, Ga, In) are discussed.
authors.affiliation: Fachbereich Chemie der Philipps-Universität Marburg and Materials Science Center, Hans-Meerwein-Straße 4, 35307 Marburg, Hessen, Germany. jsu@staff.uni-marburg.de.
authors.forename: W
authors.initials: W
authors.lastname: Schorn
authors.affiliation: Fachbereich Chemie der Philipps-Universität Marburg and Materials Science Center, Hans-Meerwein-Straße 4, 35307 Marburg, Hessen, Germany. jsu@staff.uni-marburg.de.
authors.forename: D
authors.initials: D
authors.lastname: Grosse-Hagenbrock
authors.affiliation: Fachbereich Chemie der Philipps-Universität Marburg and Materials Science Center, Hans-Meerwein-Straße 4, 35307 Marburg, Hessen, Germany. jsu@staff.uni-marburg.de.
authors.forename: B
authors.initials: B
authors.lastname: Oelkers
authors.affiliation: Fachbereich Chemie der Philipps-Universität Marburg and Materials Science Center, Hans-Meerwein-Straße 4, 35307 Marburg, Hessen, Germany. jsu@staff.uni-marburg.de.
authors.forename: J
authors.initials: J
authors.lastname: Sundermeyer