119889-99-5Relevant academic research and scientific papers
Nitric Oxide Dioxygenase Activity of a Nitrosyl Complex of Cobalt(II) Porphyrinate in the Presence of Hydrogen Peroxide via Putative Peroxynitrite Intermediate
Mondal, Baishakhi,Saha, Soumen,Borah, Dibyajyoti,Mazumdar, Rakesh,Mondal, Biplab
, p. 1234 - 1240 (2019)
The reaction of a cobalt porphyrin complex, [(F8TPP)Co], 1 {F8TPP = 5,10,15,20-tetrakis(2,6-difluorophenyl)porphyrinate dianion} in dichloromethane with nitric oxide (NO) led to the nitrosyl complex, [(F8TPP)Co(NO)], 2. Spectroscopic studies and structural characterization revealed it as a bent nitrosyl of {CoNO}8 description. It was stable in the presence of dioxygen. However, it reacts with H2O2 in acetonitrile (or THF) solution at -40 °C (or -80 °C) to result in the corresponding Co(III)-nitrate complex, [(F8TPP)Co(NO3)], 3. The reaction presumably proceeds via the formation of a Co-peroxynitrite intermediate. X-Band electron paramagnetic resonance and electrospray ionization-mass spectroscopic studies suggest the intermediate formation of the [(porphyrin)Co(III)-O?] radical, which in turn supports the generation of the corresponding Co(IV)-oxo species during the reaction. This is in accord with the homolytic cleavage of the O-O bond in heme-peroxynitrite proposed in the nitric oxide dioxygenases activity. In addition, the characteristic peroxynitrite-induced phenol ring reaction was also observed.
Metal Exchange Reactions of o,o′-Dihalosubstituted Cd(II) Tetraphenylporphyrinates with d-Metal Salts in DMF
Chizhova, N. V.,Mamardashvili, N. Z.,Zvezdina, S. V.
, p. 1526 - 1532 (2021/09/11)
Abstract: The metal exchange reactions of Cd(II)-5,10,15,20-tetra(2,6-dichlorophenyl) porphyrin and Cd(II)5,10,15,20-tetra(2,6-difluorophenyl) porphyrin with Zn(II) and Co(II) cations in dimethylformamide were studied by the spectrophotometric method. The kinetic parameters of the metal exchange reaction were calculated and a possible stoichiometric mechanism of the process is proposed. The metal exchange reactions of 2,6-dihalogenated cadmium porphyrins with Zn(II) and Co(II) chlorides and acetates in dimethylformamide were investigated by the sampling method. Zn(II)- and Co(II)-complexes with 5,10,15,20-tetra(2,6-dichlorophenyl)porphyrin and 5,10,15,20-tetra(2,6-difluorophenyl) pophirin were synthesized and identified by UV-Vis, 1H NMR spectroscopy and mass spectrometry methods.
