Synthesis, characterization, and redox behavior of six-coordinate (por)Ru(NO)Cl compounds (por=porphyrinato dianion)
摘要:
A new high-yield preparative route to (por)Ru(NO)Cl compounds (por=porphyrinato dianion) from reactions of (por)Ru(NO)(alkoxide) precursors with boron trichloride is reported. These ruthenium nitrosyl chloride complexes are known to be useful precursors to (por)Ru(NO)-containing derivatives. The crystal structure of (OEP)Ru(NO)Cl (OEP = octaethylporphyrinato dianion) shows that the Ru-N-O linkage is linear. The redox behavior of the (por)Ru(NO)Cl compounds has been determined by cyclic voltammetry. Analysis of the data reveals that the first oxidation of the (por)Ru(NO)Cl compounds is porphyrin-ring centered. (c) 2004 Elsevier B.V. All rights reserved.
Activation of Thionitrites and Isoamyl Nitrite by Group 8 Metalloporphyrins and the Subsequent Generation of Nitrosyl Thiolates and Alkoxides of Ruthenium and Osmium Porphyrins
摘要:
Ruthenium and osmium porphyrins of the form (por)M(CO) (per = octaelhylporphyrinato diction (OEP), tetratolylporphyrinato dianion (TTP)) react with thionitrites (RSNO) and isoamyl nitrite (RONO) to give the (por)(NO)(SR) and (por)M(NO)(OR) addition products. Reaction of S-nitroso-N-acetyl-L-cysteine methyl ester with (TPP)Fe(THF)(2) (TPP tetraphenylporphyrinato dianion) gives (TPP)Fe(NO) in high yield. The related reaction of isoamyl nitrite with [(TPP)Fe(THF)(2)](+) gives the nitrosyl alcohol product [(TPP)Fe(NO)(HO-i-C5H11)](+). The solid stare structures of (OEP)Ru(NO)(NACysMe-S) (NACysMe = N-acetyl-L-cysteinate methyl ester), (TTP)Os(NO)(S-i-C5H11), and [(TPP)Fe(NO)(HO-i-C5H11)](+) have been determined by X-ray diffraction.