A nitrosyl hydride complex of a heme model [Ru(ttp)(HNO)(1-MeIm)] (ttp=tetratolylporphyrinato dianion).
Hydride reduction of the bound nitrosyl ligand in [Ru(ttp)(NO)(1-MeIm)]BF(4) (upsilon NO 1862 cm(-1); ttp=tetratolylporphyrinato dianion) by sodium borohydride in anhydrous methanol leads to the generation of the first experimentally observable heme-model-HNO complex [Ru(ttp)(HNO)(1-MeIm)] in 77% isolated yield. The (1)H NMR spectrum of the compound in CDCl(3) shows a downfield resonance at 13.64 ppm assigned to the proton of the HNO ligand, and this peak splits into a doublet (JNH Hz) in the [Ru(ttp)(H(15)NO)(1-MeIm)] derivative. The IR spectrum of the solid as a KBr pellet reveals a strong band at 1380 cm(-1) assigned to upsilon NO; this band shifts to 1348 cm(-1) in the isotope-labeled [Ru(ttp)(H(15)NO)(1-MeIm)].
Lee
Jonghyuk
J
Department of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, OK 73019, USA.
Richter-Addo
George B
GB
D006418:Heme / Q000031:analogs & derivatives* / Q000737:chemistry; D008956:Models, Chemical; D009603:Nitroso Compounds / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
D009603:Nitroso Compounds; D006418:Heme; D012428:Ruthenium