title: Molecular structure, UV/vis spectra, and cyclic voltammograms of Mn(II), Co(II), and Zn(II) 5,10,15,20-tetraphenyl-21-oxaporphyrins.
abstract: The 5,10,15,20-tetraphenyl-21-oxaporphyrin complexes of Mn(II), Co(II), and Zn(II) have been crystallized and studied by X-ray diffraction, NMR and UV/vis spectroscopy, and mass spectrometry as well as cyclic voltammetry. The X-ray structure of the earlier described Cu(II) complex is also reported. All complex structures possess a five-coordinate, approximately square-pyramidal geometry with a slight deviation of the heteroaromatic moieties from planarity. The packing structures are characterized by parallel strands of complex molecules interacting by weak hydrogen bonds. In the case of Zn(II) an octahedral complex has also been isolated using a side-chain hydroxy functionalized oxaporphyrin ligand; the structure was verified by NMR and EXAFS spectroscopy. Cyclic voltammetry studies reveal that the reduction of the complex bound Mn(II), Co(II), and Zn(II) ions is a ligand-centered process whereas the first oxidation step depends on the metal ion present.
authors: Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden, Germany.
authors: Silvio
authors: S
authors: Stute
authors: Linda
authors: L
authors: Götzke
authors: Dirk
authors: D
authors: Meyer
authors: Mohamed L
authors: ML
authors: Merroun
authors: Peter
authors: P
authors: Rapta
authors: Olga
authors: O
authors: Kataeva
authors: Wilhelm
authors: W
authors: Seichter
authors: Kerstin
authors: K
authors: Gloe
authors: Lothar
authors: L
authors: Dunsch
authors: Karsten
authors: K
authors: Gloe
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D055664:Electrochemical Techniques; D008345:Manganese / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D015032:Zinc / Q000737:chemistry*
chemical_list: D008665:Metalloporphyrins; D009942:Organometallic Compounds; D003035:Cobalt; D008345:Manganese; D015032:Zinc