title: Synthesis and molecular structures of nitrosoarene metalloporphyrin complexes of ruthenium.
abstract: Several new ruthenium porphyrins containing nitrosoarene ligands have been synthesized and characterized by IR and (1)H NMR spectroscopy, and by single-crystal X-ray crystallography. Bis-nitrosoarene complexes of the form (por)Ru(ArNO)(2)(Ar = aryl group; por = TPP, TTP; TPP = tetraphenylporphyrinato dianion, TTP = tetratolylporphyrinato dianion) were prepared in good yields from the reaction of the nitrosoarenes with (por)Ru(CO). The IR spectra of the complexes (as KBr pellets) display new bands in the 1346-1350 cm(-1) region due to nu(NO). Reactions of the (por)Ru(ArNO)(2) complexes with excess pyridine and 1-methylimidazole produce the mono-nitrosoarene complexes (por)Ru(ArNO)(py) and (por)Ru(ArNO)(1-MeIm), respectively. The IR spectra of these mono-nitrosoarene complexes reveal a lowering of nu(NO) by 14-44 cm(-1), a feature consistent with the replacement of one of the pi-acid ArNO ligands with the more basic pyridine and 1-MeIm ligands. The solid-state molecular structures of two members of each of the three classes of compounds, namely (por)Ru(ArNO)(2), (por)Ru(ArNO)(py) and (por)Ru(ArNO)(1-MeIm) were determined by single-crystal X-ray diffraction, and reveal the N-binding mode of the ArNO ligands.
authors.affiliation: Department of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, Oklahoma 73019, USA.
authors.forename: Jonghyuk
authors.initials: J
authors.lastname: Lee
authors.forename: Brendan
authors.initials: B
authors.lastname: Twamley
authors.forename: George B
authors.initials: GB
authors.lastname: Richter-Addo