After synthesis of an asymmetric tetradentate ONN＇O＇ Schiff base ligand （H2L） followed by reaction of the synthesized H2L with an equimolar mixture of methanolic solutions of the VO（acac）2, a new oxidovanadium...After synthesis of an asymmetric tetradentate ONN＇O＇ Schiff base ligand （H2L） followed by reaction of the synthesized H2L with an equimolar mixture of methanolic solutions of the VO（acac）2, a new oxidovanadium（IV） Schiff base complex （VOL） was synthesized. The Schiff base ligand and its complex were characterized by FT-IR and UV-vis spectra and C, H, N analysis, The crystal structure of VOL was also determined by single crystal X-ray analysis. The VOL complex crystallizes in monoclinic space group Cc. The Schiffbase ligand acts as a tetradentate ligand through its two＇iminic nitrogens and two phenolic and acetylacetonate oxygens. Thermogravimetric analysis of the VOL showed that it decomposes in two steps and converts to mixed vanadium oxides at 477℃. In addition, thermal decomposition of the VOL complex in air at 660 ℃ leads to formation of V2O5 nanoparticles with the average size estimated from XRD 49 nm. The catalytic activity of the VOL complex was investigated in the epoxidation reaction and different reaction parameters were optimized. The results showed that the cyclic alkenes were efficiently converted to the corresponding epoxides, whereas the VOL did not appreciably convert the linear alkenes.展开更多
Correction for‘Unexpected in crystallo reactivity of the potential drug bis(maltolato)oxidovanadium(Ⅳ)with lysozyme’by Maddalena Paolillo et al.,Inorg.Chem.Front.,2024,11,6307-6315,https://doi.org/10.1039/D4QI01528...Correction for‘Unexpected in crystallo reactivity of the potential drug bis(maltolato)oxidovanadium(Ⅳ)with lysozyme’by Maddalena Paolillo et al.,Inorg.Chem.Front.,2024,11,6307-6315,https://doi.org/10.1039/D4QI01528B.The authors regret that there was an error in Fig.3B of the original article,whereby two double bonds were missing from the chemical structure.The correct version of Fig.3 is shown below.展开更多
Reactions of o-phenylenediamine derivatives(L_(3)H_(2))incorporating a(Ph)(Py)(H)C–N(H)–function with the oxidovanadium(IV)and oxidomolybdenum(VI)ions afford amide complexes of types[V^(IV)O(L_(3)^(2−))](3),[V^(IV)O...Reactions of o-phenylenediamine derivatives(L_(3)H_(2))incorporating a(Ph)(Py)(H)C–N(H)–function with the oxidovanadium(IV)and oxidomolybdenum(VI)ions afford amide complexes of types[V^(IV)O(L_(3)^(2−))](3),[V^(IV)O-(L_(3)^(t-Bu 2−))](4)and cis-[Mo^(VI)O_(2)(L_(3)^(2−))](5)(L_(3)H_(2)=((E)-2-(((2-((phenyl(pyridin-2-yl)methyl)amino)phenyl)-imino)methyl)phenol).展开更多
基金the Damghan UniversityGolestan University for financial supportsupported by the project 14-03276S of the Czech Science Foundation
文摘After synthesis of an asymmetric tetradentate ONN＇O＇ Schiff base ligand （H2L） followed by reaction of the synthesized H2L with an equimolar mixture of methanolic solutions of the VO（acac）2, a new oxidovanadium（IV） Schiff base complex （VOL） was synthesized. The Schiff base ligand and its complex were characterized by FT-IR and UV-vis spectra and C, H, N analysis, The crystal structure of VOL was also determined by single crystal X-ray analysis. The VOL complex crystallizes in monoclinic space group Cc. The Schiffbase ligand acts as a tetradentate ligand through its two＇iminic nitrogens and two phenolic and acetylacetonate oxygens. Thermogravimetric analysis of the VOL showed that it decomposes in two steps and converts to mixed vanadium oxides at 477℃. In addition, thermal decomposition of the VOL complex in air at 660 ℃ leads to formation of V2O5 nanoparticles with the average size estimated from XRD 49 nm. The catalytic activity of the VOL complex was investigated in the epoxidation reaction and different reaction parameters were optimized. The results showed that the cyclic alkenes were efficiently converted to the corresponding epoxides, whereas the VOL did not appreciably convert the linear alkenes.
文摘Correction for‘Unexpected in crystallo reactivity of the potential drug bis(maltolato)oxidovanadium(Ⅳ)with lysozyme’by Maddalena Paolillo et al.,Inorg.Chem.Front.,2024,11,6307-6315,https://doi.org/10.1039/D4QI01528B.The authors regret that there was an error in Fig.3B of the original article,whereby two double bonds were missing from the chemical structure.The correct version of Fig.3 is shown below.
基金support received from DST(SR/S1/IC/0026/2012)CSIR(01/2699/12-EMR-II)New Delhi+1 种基金India is gratefully acknowledged.SB(CSIR no.8/531(0006)/2012-EMR-I)MKB(CSIR no.8/531(0007)/2012-EMR-I)are thankful to CSIR,New Delhi,India,for fellowships.
文摘Reactions of o-phenylenediamine derivatives(L_(3)H_(2))incorporating a(Ph)(Py)(H)C–N(H)–function with the oxidovanadium(IV)and oxidomolybdenum(VI)ions afford amide complexes of types[V^(IV)O(L_(3)^(2−))](3),[V^(IV)O-(L_(3)^(t-Bu 2−))](4)and cis-[Mo^(VI)O_(2)(L_(3)^(2−))](5)(L_(3)H_(2)=((E)-2-(((2-((phenyl(pyridin-2-yl)methyl)amino)phenyl)-imino)methyl)phenol).
