title: Boron-centered soft ligands based on tetrazole units and their complexes with sodium, potassium and bismuth ions.
abstract: The syntheses of Na(Ttt(Me)) (), K(Ttt(Me)) (), K(Btt(Me)) (), and Na(Btt(Ph)) () are reported, where (Ttt(Me))(-) and (Btt(R))(-) (R = Me, Ph) are tri- and di-substituted boron-centered soft ligands; they were produced by the reaction of NaBH4 and KBH4 with the corresponding tetrazole heterocycles: 1-methyl-5-thiotetrazole (L(1)H) and 1-phenyl-5-thiotetrazole (L(2)H). The syntheses of Na(Ttt(Me)) () and K(Ttt(Me)) () were carried out following Trofimenko's protocol. The anion (Ttt(Me))(-) is a typical Janus scorpionate ligand. Na(Ttt(Me)) () and Na(Btt(Ph)) () were reacted with Bi(CH3COO)3 to observe the coordination pattern of these ligands towards bismuth ions. These reactions afforded the complexes [Bi(Ttt(Me))2(CH3COO)] (), [Bi(L(2))2]2 (, ) and [Bi(L(2))3] (). The products were characterized by NMR spectroscopy, elemental analyses and mass spectrometry. Solid state structures were determined by X-ray diffraction of single crystals of , , , , , , and . M(Ttt(Me)) (M = Na (), K ()) and K(Btt(Me)) () exhibit sheet-like structures. The alkali metal complexes dissociate in solution as observed in (1)H, (13)C NMR and (1)H diffusion NMR experiments. Negative mode ESI-MS data also indicate the presence of monomers. Both the sodium salts of (Ttt(Me))(-) and (Btt(Ph))(-) as well as the Bi complexes and were investigated by absorption and emission spectroscopy.
authors.affiliation: Universität Bielefeld, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Universitätsstraße 25, 33615 Bielefeld, Germany. mitzel@uni-bielefeld.de.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Imran
authors.forename: Andreas
authors.initials: A
authors.lastname: Mix
authors.forename: Beate
authors.initials: B
authors.lastname: Neumann
authors.forename: Hans-Georg
authors.initials: HG
authors.lastname: Stammler
authors.forename: Uwe
authors.initials: U
authors.lastname: Monkowius
authors.forename: Petra
authors.initials: P
authors.lastname: Bleckenwegner
authors.forename: Norbert W
authors.initials: NW
authors.lastname: Mitzel