141556-45-8Relevant articles and documents
Synthesis, characterization, electrochemical properties and catalytic reactivity of N-heterocyclic carbene-containing diiron complexes
Wang, Yanhong,Zhang, Tianyong,Li, Bin,Jiang, Shuang,Sheng, Liao
, p. 29022 - 29031 (2015)
(μ-dmedt)[Fe(CO)3]2 (I, dmedt = 2,3-butanedithiol) was chosen as the parent complex. A series of new model complexes, N-heterocyclic carbene (NHC) substituted (μ-dmedt)[Fe-Fe]-NHC (II, (μ-dmedt)[Fe(CO)2]2[IMe(CH2)2IMe], IMe = 1-methylimidazol-2-ylidene; III, {(μ-dmedt)[Fe2(CO)5]}2[IMe(CH2)2IMe]; IV, (μ-dmedt)[Fe2(CO)5]IMes, IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene; V, (μ-dmedt)[Fe2(CO)5]IMe, IMe = 1,3-dimethylimidazol-2-ylidene) as mimics of the [Fe-Fe]-H2ase active site were synthesized from I and characterized using solution IR spectroscopy, NMR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The electrochemical properties of complexes I-V, with and without the addition of HOAc, were investigated by cyclic voltammetry in the coordinating solvent CH3CN to evaluate the effects of different NHC ligands on the redox properties of the iron atoms of the series of complexes. It was concluded that all the new complexes are electrochemical catalysts for proton reduction to hydrogen. The symmetrically substituted cisoid basal/basal coordination complex II displays the most negative reduction potential owing to the stronger δ-donating ability of the NHC and the orientation of the NHC donor carbon as a result of the constraints of the bridging bidentate ligands. A new application for the [Fe-Fe]-NHC model complexes in the direct catalytic hydroxylation of benzene to phenol was also studied. Under the optimized experimental conditions (II, 0.01 mmol; benzene, 0.1 mL; CH3CN, 2.0 mL; H2O2, 6.0 mmol; 60 °C, 3 h), the maximal phenol yield was 26.7%.
Application of Quantitative 1H and 19F NMR to Organometallics
Akhdar, Ayman,Andanson, Jean-Michel,Faure, Sophie,Gautier, Arnaud,Tra?kia, Mounir
, (2021/08/03)
Purity assessment of organometallics is particularly important for catalytic applications. While quantitative NMR is a well-known method in pharmaceutic chemistry, the present work illustrates its usefulness for the determination of the ligands and organometallics purities using proton and fluorine NMR. This method is fast, straightforward and provides accuracy results.
New expanded-ring NHC platinum(0) complexes: Synthesis, structure and highly efficient diboration of terminal alkenes
Rzhevskiy, Sergey A.,Topchiy, Maxim A.,Lyssenko, Konstantin A.,Philippova, Anna N.,Belaya, Maria A.,Ageshina, Alexandra A.,Bermeshev, Maxim V.,Nechaev, Mikhail S.,Asachenko, Andrey F.
supporting information, (2020/02/18)
The synthesis and structural characterization of a series of novel platinum(0) complexes were reported. A number of (NHC)Pt(dvtms) (dvtms = 1,3-divinyl-1,1,3,3-tetramethyldisiloxane) complexes were investigated in catalytic addition of B2Pin2 to terminal alkenes. The novel expanded ring N-heterocyclic carbene complex (7-Dipp)Pt(dvtms) showed highest performance, turnover numbers up to 3800 were achieved. The scope of the reaction was illustrated by 20 examples with a variety of alkyl, alkoxy, halogen, ester, ketone and acetal substituents.
