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.
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.
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.