Reference of 3153-26-2, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V. In a Article£¬once mentioned of 3153-26-2
Oxidovanadium catechol complexes: Radical versus non-radical states and redox series
A new family of oxidovanadium complexes, [(L1 R)(VO)(LR?)] (R = H, R? = H, 1; R = H, R? = -CMe3, 2; R = H, R? = Me, 3; R = -CMe3, R? = H, 4 and R = -CMe3, R? = -CMe3, 5), incorporating tridentate L1RH ligands (L1 RH = 2,4-di-R-6-{(2-(pyridin-2-yl)hydrazono)methyl}phenol) and substituted catechols (LR?H2) was substantiated. The V-Ophenolato (cis to V=O), V-OCAT (cis to V=O) and V-OCAT (trans to V=O) lengths span the ranges, 1.894(2)-1.910(2), 1.868(2)-1.887(2), and 2.120(2)-2.180(2) A. The metrical oxidation states (MOS) of the catechols in 1-5 are fractional and vary from -1.43 to -1.60. The 51V isotropic chemical shifts of solids and solutions of 1-5 are deshielded (51V CP MAS: -19.8 to +248.6; DMSO-d6: +173.9 to +414.55 ppm). The closed shell singlet (CSS) solutions of 1-5 are unstable due to open shell singlet (OSS) perturbations. The ground electronic states of 1-5 are defined by the resonance contribution of the catecholates (L R?CAT2-) and LR? SQ-? coordinated to the [VO]3+ and [VO]2+ ions. 1-5 are reversibly reducible by one electron at -(0.58-0.87) V, referenced vs ferrocenium/ferrocene, to VO2+ complexes, [(L1R-)(VO2+)(L R?CAT2-)]- [1-5]-. 1-5 display another quasi-reversible or irreversible reduction wave at -(0.80-1.32) V due to the formation of hydrazone anion radical (L 1R2-?) complexes, [(L1 R2-?)(VO2+)(LR?CAT 2-)]2-, [1-5]2-, with S = 1 authenticated by the unrestricted density functional theory (DFT) calculations on 12- and 32- ions. Frozen glasses electron paramagnetic resonance (EPR) spectra of [1-5]- ions [e.g., for 2, g|| = 1.948, g = 1.979, A|| = 164, A = 60] affirmed that [1-5]- ions are the [VO]2+ complexes of LR?CAT 2-. Spectro-electrochemical measurements and time-dependent DFT (TD DFT) calculations on 1, 3, 1-, 3-, and 12- disclosed that the near infrared (NIR) absorption bands of 1-5 at 800 nm are due to the CSS-OSS metal to ligand charge transfer which are red-shifted in the solid state and disappear in [1-5]- and [1-5]2- ions.
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Reference of 3153-26-2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 3153-26-2, in my other articles.
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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI