title: Synthesis, spectroscopic and crystallographic analysis of the Zn-complex of a di(β,β'-sulfoleno)pyrrin: model for Zn-complexes of bilirubin and of phylloxanthobilins.
abstract: A high yield preparation, spectroscopic and crystallographic investigation of the crystalline Zn-complex of a di(β,β'-sulfoleno)pyrrin are reported here. In the brightly green fluorescent Zn-complex of the hardly luminescent di(β,β'-sulfoleno)pyrrin, the metal ion is bound by two di(β,β'-sulfoleno)pyrrin ligands, as revealed first by its mass spectra. The crystal structure of this Zn-complex of the di(β,β'-sulfoleno)pyrrin confirmed a regular 2:1 composition of the bidentate di(β,β'-sulfoleno)pyrrin ligand and the metal ion. The latter was coordinated in a distorted tetrahedral fashion, as found in other dipyrrin Zn-complexes. The here studied Zn-complex of a designed di(β,β'-sulfoleno)pyrrin ligand provides insights into the coordination properties of the proposed (2:1)- and (2:2)-complexes of phylloxanthobilin and bilirubin, respectively, which are two abundant natural bilin-type tetrapyrroles.
authors.affiliation: Institute of Organic Chemistry and Centre of Molecular Biosciences, University of Innsbruck, 6020 Innsbruck, Austria ; School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People's Republic of China.
authors.forename: Chengjie
authors.initials: C
authors.lastname: Li
authors.affiliation: Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Klaus
authors.initials: K
authors.lastname: Wurst
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People's Republic of China.
authors.forename: Yaqing
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Institute of Organic Chemistry and Centre of Molecular Biosciences, University of Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Kräutler
keywords: Coordination chemistry; Crystal structure; Dipyrrin; Fluorescence spectroscopy; Zn-complex