title: Pyrazine as a building block for molecular architectures with PtII.
abstract: A series of pyrazine (pz) complexes containing cis-(NH(3))(2)Pt(II), (tmeda)Pt(II) (tmeda = N,N,N',N'-tetramethylethylenediamine), and trans-(NH(3))(2)Pt(II) entities have been prepared and characterized by X-ray crystallography and/or 1H NMR spectroscopy. In these compounds, the pz ligands act as monodentate (1-3) or bidentate bridging ligands (4-7). Three variants of the latter case are described: a dinuclear complex [Pt(II)]2 (4b), a cyclic tetranuclear [Pt(II)](4) complex (5), and a trinuclear mixed-metal complex [Pt2Ag] (7). Mono- and bidentate binding modes are readily differentiated by 1H NMR spectroscopy, and the assignment of pz protons in the case of monodentate coordination is aided by the observation of (195)Pt satellites. Formation of the open molecular box cis-[{(NH3)2Pt(pz)}4](NO3)8.3.67H2O (5) from cis-(NH3)2Pt(II) and pz follows expectations of the "molecular library approach" for the generation of a cyclic tetramer.
authors.affiliation: Fachbereich Chemie, Universität Dortmund, 44221 Dortmund, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Willermann
authors.forename: Clodagh
authors.initials: C
authors.lastname: Mulcahy
authors.forename: Roland K O
authors.initials: RK
authors.lastname: Sigel
authors.forename: Marta Morell
authors.initials: MM
authors.lastname: Cerdà
authors.forename: Eva
authors.initials: E
authors.lastname: Freisinger
authors.forename: Pablo J
authors.initials: PJ
authors.lastname: Sanz Miguel
authors.forename: Michael
authors.initials: M
authors.lastname: Roitzsch
authors.forename: Bernhard
authors.initials: B
authors.lastname: Lippert