20485-44-3Relevant articles and documents
Enhancing electrocatalytic hydrogen evolution by nickel salicylaldimine complexes with alkali metal cations in aqueous media
Shao, Haiyan,Muduli, Subas K.,Tran, Phong D.,Soo, Han Sen
, p. 2948 - 2951 (2016)
New salicylaldimine nickel complexes, comprising only earth-abundant elements, have been developed for electrocatalytic hydrogen evolution in aqueous media. The second-sphere ether functionalities on the periphery of the complexes enhance the electrocatalytic activity in the presence of alkali metal cations. The electrocatalysts demonstrate improved performances especially in the economical and sustainable seawater reaction medium.
Synthesis and Structure of Nickel(II) Complex with Methyl-Substituted N2O2 Tetradentate Shiff Base
Bykov, V. A.,Danilova, Yu. S.,Karushev, M. P.,Novozhilova, M. V.,Polozhentseva, Yu. A.,Spiridonova, D. V.,Timonov, A. M.
, p. 747 - 749 (2021/06/07)
Abstract: The crystal structure of the N,N′-(2,3-dimethylbutane-2,3-diylbis(3-methylsalicylideneiminate)nickel(II) complex was determined by means of single crystal X-ray analysis. The main characteristics of the complex obtained by 1H NMR, UV-VIS, and IR spectroscopy and voltammetry are presented.
Nickel(II) and palladium(II) complexes of azobenzene-containing ligands as dichroic dyes
Blackburn, Octavia A.,Coe, Benjamin J.,Fielden, John,Helliwell, Madeleine,McDouall, Joseph J. W.,Hutchings, Michael G.
scheme or table, p. 9136 - 9150 (2011/01/06)
A large series of complexes has been synthesized with two chelating, Schiff base azobenzene derivatives connected linearly by coordination to a central nickel(II) or palladium(II) ion. These compounds have the general formulas MII(OC6H3-2-CHNR-4-NdNC6H 4-4-CO2Et)2 [M = Ni; R = n-Bu (3c), n-C 6H13 (3d), n-C8H17 (3e), n-C 12H25 (3f), Ph (3g), OH (3h), C6H 4-4-CO2Et (3i). M = Pd; R = i-Pr (4a), t-Bu (4b), n-Bu (4c), n-C6H13 (4d), n-C8H17 (4e), n-C12H25 (4f), Ph (4g)], MII[OC 6H3-2-CHN(n-C8H17)-4-NdNC 6H4-4-CO2(n-C8H17)] 2 [M = Ni (9), Pd (10)], MII[OC6H 3-2-CHN(n-C8H17)-4-NdNC6H 4-4-C6H4-4-O(n-C7H 15)]2 [M = Ni (14), Pd (15)], and MII[OC 6H3-2-CHN(CMe2)-4-NdNC6H 4-4-CO2Et]2 [M = Ni (17), Pd (18); the CMe 2 groups are connected]. These compounds have been characterized by using various physical techniques including 1H NMR spectroscopy and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. Single-crystal X-ray structures have been obtained for two pro-ligands and five complexes (3e, 4e, 14, 15, and 17). The latter always show a strictly square planar arrangement about the metal center, except for the NiII complex of a salen-like ligand (17). In solution, broadened 1H NMR signals indicate distortions from square planar geometry for the bis-chelate NiII complexes. Electronic absorption spectroscopy and ZINDO -S (Zerner's intermediate neglect of differential overlap) and TD-DFT (time-dependent density functional theory) calculations show that the lowest energy transition has metal-to-ligand charge-transfer character. The λmax of this band lies in the range of 409-434 nm in dichloromethane, and replacing NiII with PdII causes small blue-shifts. Dichroic ratios measured in various liquid crystal hosts show complexation-induced increases with NiII, but using PdII has a detrimental effect.
Lightscattering and viscosities measurements of dilute solutions of some Schiff base polymers
Channar, Abdul Hamid,Mahar, Khalida Parveen,Khuhawar, Muhammad Yar,Majidano, Subhan Ali,Khan, Muhammad Saleem
experimental part, p. 156 - 161 (2011/10/05)
Three Schiff base polymers polymethylene-bis(salicylaldehyde) tetramethyleth]enediimine (PMSATen). polymethylene-bis(salicylaldehyde)meso- stillbenediimine(meso-PM.SAS) and poly-methylene-bis(2-hydroxyacetophenone)1,2- propylenediimine (PMHAPn) were prepared and indicated refractive index increments (da/dc) within 0.223-0.241 at 436 nm and 0.155-0.130 at 546 nm. The data for dn/dc was obtained by extrapolating intercept of plot An/c against concentration to zero concentration. The values of Hc/τ (τ = turbidity) were plotted against concentration and reciprocal of the intercept at zero concentration gave the molecular weight in the range of 58100-66890 The polymers were examined for reduced, intrinsic, inherent and absolute viscosities. Thermodynamic parametcrs as energy of activation (ΔGv), heat of activation (ΔHv) and entropy of activation (ΔSv) of viscous flow were calculated at different temperatures.
Synthesis and properties of polymeric copper complexes with schiff bases
Rodyagina,Chepurnaya,Vasil'eva,Timonov
, p. 1391 - 1397 (2008/02/01)
The electrochemical synthesis and properties of polymeric copper complexes with tetradentate (N2O2) Schiff bases were studied. The effects of the metal center and ligand surrounding of the starting compounds on the mechanism and kinetics of the charge transport in the polymers are discussed.
Nitronyl and imino nitroxides: Improvement of Ullman's procedure and report on a new efficient synthetic route
Hirel, Catherine,Vostrikova, Kira E.,Pecaut, Jacques,Ovcharenko, Victor I.,Rey, Paul
, p. 2007 - 2014 (2007/10/03)
The synthesis of nitronyl and imino nitroxides has been reexamined with the aim of both increasing yields and of offering opportunities for new structures. The conditions for the formation of 2,3-bis(hydroxyamino)-2,3-dimethylbutane, the key intermediate of Ullman's route, have been carefully studied, and a new procedure is proposed, which affords the free base in a very pure form and up to 60% yield. Full characterization of this intermediate including an X-ray crystal structure is presented. An alternative synthetic route through 2,3-diamino-2,3-dimethylbutane and the corresponding imidazolidines which bypasses the delicate synthesis of the bis(hydroxyamino) compound is described. It is shown that 3-chloroperbenzoic acid is an effective oxidant for the transformation of adequately substituted imidazolidines into nitronyl nitroxides, which are obtained in high yield. An illustration of the potentialities of this new route, a new nitronyl nitroxide with two ethyl substituents in positions 4 and 5 of the imidazoline ring, is reported. The scope and limitations of the two routes are discussed.
Alkene addition process
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, (2008/06/13)
A process is provided comprising contacting a hydrocarbyl alkali metal compound with a nitrogen-containing compound in the presence of propylene. Optionally, a catalytic support is used during said contacting. Optionally, at least one other alpha-olefin is present during said contacting. In another embodiment a process is provided comprising: (a) contacting a hydrocarbyl alkali metal compound with a nitrogen-containing compound in the presence of propylene; and thereafter (b) recovering an allyl/alkali metal/nitrogen complex; and thereafter (c) contacting said allyl/alkali metal/nitrogen complex with at least one alpha-olefin. Optionally, a catalytic support is present during steps a, b, and c.
Photochemical dimerization and functionalization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and silanes
-
, (2008/06/13)
The space-time yield and/or the selectivity of the photochemical dimerization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and primary, secondary and tertiary silanes with Hg and U.V. light is enhanced by refluxing the substrate in the irradiated reaction zone at a temperature at which the dimer product condenses and remains condensed promptly upon its formation. Cross-dimerization of the alkanes, ethers and silanes with primary alcohols is disclosed, as is the functionalization to aldehydes of the alkanes with carbon monoxide.
207. Steric Crowding in Coordination Compounds: Electron-Transfer Kinetics of the 3+/2+ Couple (tmen = 2,3-Dimethylbutane-2,3-diamine)
Hendry, Philip,Ludi, Andreas
, p. 1966 - 1970 (2007/10/02)
The 3+ complex ion (tmen = 2,3-dimethylbutane-2,3-diamine) has been synthesized and its redox characteristics compared to those of its parent ion 3+.The 12 peripheral Me groups significantly affect the properties
