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• W2015373539 endingPage "710" @default.
• W2015373539 startingPage "701" @default.
• W2015373539 abstract "N-bridged diiron tetra-tert-butylphthalocyanine activates H2O2 to form anionic hydroperoxo complex [(Pc)FeIVN–FeIII(Pc)–OOH]− prone to heterolytic cleavage of O–O bond with the release of OH− and formation of neutral diiron oxo phthalocyanine cation radical complex, PcFeIVN–FeIV(Pc+˙)O. ESI-MS data showed stability of the Fe–N–Fe binuclear structure upon formation of this species, capable of oxidizing methane and benzenevia O-atom transfer. The slow formation kinetics and the high reactivity preclude direct detection of this oxo complex by low temperature UV-vis spectroscopy. However, strong oxidizing properties and the results of EPR study support the formation of PcFeIVN–FeIV(Pc+˙)O. Addition of H2O2 at −80 °C led to the disappearance of iron EPR signal and to the appearance of the narrow signal at g = 2.001 consistent with the transient formation of PcFeIVN–FeIV(Pc+˙)O. In the course of this study, another high valent diiron species was prepared in the solid state with 70% yield. The Mössbauer spectrum shows two quadrupole doublets with δ1 = −0.14 mm s−1, ΔEQ1 = 1.57 mm s−1 and δ2 = −0.10 mm s−1, ΔEQ2 = 2.03 mm s−1, respectively. The negative δ values are consistent with formation of Fe(IV) states. Fe K-edge EXAFS spectroscopy reveals conservation of the diiron Fe–N–Fe core. In XANES, an intense 1s → 3d pre-edge feature at 7114.4 eV suggests formation of Fe(IV) species and attaching of one oxygen atom per two Fe atoms at the 1.90 Å distance. On the basis of Mössbauer, EPR, EXAFS and XANES data this species was tentatively assigned as (Pc)FeIVN–FeIV(Pc)–OH which could be formed from PcFeIVN–FeIV(Pc+˙)O by hydrogen atom abstraction from a solvent molecule. Thus, despite unfavourable kinetics, we succeeded in the preparation of the first dirion(IV) phthalocyanine complex with oxygen ligand, generated in the (Pc)FeIVN–FeIII(Pc) – H2O2 system capable of oxidizing methane." @default.
• W2015373539 created "2016-06-24" @default.
• W2015373539 creator A5043491105 @default.
• W2015373539 creator A5043492701 @default.
• W2015373539 creator A5049552239 @default.
• W2015373539 creator A5074117197 @default.
• W2015373539 creator A5088340063 @default.
• W2015373539 date "2011-01-01" @default.
• W2015373539 modified "2023-10-17" @default.
• W2015373539 title "High-valent diiron species generated from N-bridged diiron phthalocyanine and H₂O₂" @default.
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