17061-62-0Relevant articles and documents
Synthesis, spectral, crystal structures, Hirshfeld surface analysis and DFT studies on bis(N,N-di(4-methoxybenzyl)dithiocarbamato-S,S′)zinc(II) and its imine adducts: new precursor for the preparation of hexagonal ZnS
Selvaganapathi, Pandurangan,Thirumaran, Subbiah,Ciattini, Samuele
, p. 655 - 667 (2017)
[Zn(4-mbzdtc)2] (1), [Zn(4-mbzdtc)2(py)] (2), [Zn2(4-mbzdtc)4(4,4′-bipy)] (3), and [Zn(4-mbzdtc)2(2,2′-bipy)] (4), (where, 4-mbzdtc = N,N-di(4-methoxybenzyl)dithiocarbamate) were prepared and characte
Photo-Electroswitchable Arylaminoazobenzenes
Saint-Louis, Carl Jacky,Warner, David J.,Keane, Katie S.,Kelley, Melody D.,Meyers, Connor M.,Blackstock, Silas C.
, p. 11341 - 11353 (2021/08/24)
Azobenzenes appended with a redox-active arylamino group (redox auxiliary, RA) are prepared and shown to undergo fast, complete, and catalytic Z→E azo isomerization upon electron loss from the RA unit of the azobenzene. The RA-azo structures can be reversibly (E→Z→E)n cycled by sequential photo- and electrostimulation. Due to the robust nature of the RA?+-azo radical cation chain carrying species, initiation of electron transfer (ET) catalysis occurs at low levels (1.0-0.04 mol %) of catalytic loading and is effective even at Z-RA-azo concentrations of 10-4-10-5 M, yielding TONs (turnover numbers) of 100-2300 under such dilute conditions. The RA-azo Z→E conversion is demonstrated using chemical oxidation (redox switching), electrochemical oxidation (electro switching), and photochemical oxidation (photoredox switching). The Z→E acceleration is shown to be at least 2 × 109-fold for RA-azo 5. DFT calculations on methyl yellow suggest that a N-centered radical cation of the RA group stabilizes the Z→E N-N twist transition state of the RA?+-azo, yielding a large reduction in the barrier for RA?+-azo compared to neutral RA-azo. The RA-azo structure class has nanomechanical features that can be toggled with photo- and electrostimulation, the latter offering a quick switch for complete Z→E conversion.
Platinum Nanoparticles Uniformly Dispersed on Covalent Organic Framework Supports for Selective Synthesis of Secondary Amines
Li, Xinjun,Liu, Jianguo,Ma, Longlong,Tang, Long,Wang, Chenguang,Wang, Nan
, (2022/01/22)
Covalent organic frameworks (COFs) with pore structures are talented supports for active components. In this report, COF has been rationally fabricated and served as host for growing uniformly dispersed platinum nanoparticles with a narrow size distribution (2 nm). The obtained hybrid Pt/COF exhibits high catalytic activity in the reductive amination of benzaldehyde towards secondary amines with a yield of 96 % and good recyclability. The preferable selectivity towards secondary amines could be attributed to synergistic effects of active platinum nanoparticles and COF, in which metallic Pt nanoparticles were uniformly dispersed with a positively charged surface. This work will open an avenue towards controlling the interaction between active metals and support as well as rational design of catalysts for demanding transformations for fine agrochemicals intermediates.