37981-00-3Relevant academic research and scientific papers
UV-Vis-NIR spectroscopy and colour of bis(N-phenylsalicylaldiminato)cobalt(II) in a variety of solvents
Ku?niarska-Biernacka, Iwona,Bartecki, Adam,Kurzak, Krzysztof
, p. 997 - 1007 (2003)
Cobalt(II) complex with Schiff base obtained by condensation aniline with salicylaldehyde cobalt(II) complex, was studied in variety of solvents. The product i.e. salicylidene-anilinecobalt(II) ([Co(salan)2]) complex is a red crystalline compound easily soluble in common solvents like chloroform (CHCl3), benzene (Bz), toluene (MBz), dioxane (DX), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and acetonitrile (ACN) that is a necessary condition to observe solvatochromism. It has been characterised by elemental analyses, molar conductivities, ultraviolet (UV) and visible (Vis) spectroscopy. The molar conductivities indicate their non-electrolytic properties in all the solvents. Electronic spectra have been used to postulate the tetrahedral geometry for the species in solutions and to determine the coordination properties of ligators and their bonding abilities (ligand-field parameters), as well as their solvatochromism. The results obtained show fine colour changes. For discrimination of colour changes we applied CIE and CIELAB colour spaces.
Reaction of Electrogenerated I(salen)>- with t-Butyl Bromide and t-Butyl Chloride
Puxeddu, Anna,Costa, Giacomo,Marsich, Nazario
, p. 1489 - 1493 (1980)
The compound I(salen)>- electrogenerated in the presence of ButX (X = Cl or Br) yields II(salen)> and organic products.With ButBr the reaction takes place in two steps, the rates of which have been determined.The first step leads to rapid disappearance of I(salen)>- by a second-order reaction and has been studied by cyclic voltammetry.The second step is the slower regeneration of II(salen)>.When II(salen)> is reduced to I(salen)>- in the presence of ButBr an overall electrocatalytic process ensues which has been studied by controlled-potential reduction and polarography.All evidence is consistent with the formation of an unstable organometallic intermediate which decomposes into II(salen)>. 2-Methylpropene and hydrogen are the main products arising from the butyl radical.
Cobalt-Catalyzed C(sp2)-C(sp3) Suzuki-Miyaura Cross-Coupling Enabled by Well-Defined Precatalysts with L,X-Type Ligands
Chirik, Paul J.,Gygi, David,Kim, Junho,Ludwig, Jacob R.,Mills, L. Reginald,Simmons, Eric M.,Wisniewski, Steven R.
, p. 1905 - 1918 (2022/02/07)
Cobalt(II) halides in combination with phenoxyimine (FI) ligands generated efficient precatalysts in situ for the C(sp2)-C(sp3) Suzuki-Miyaura cross-coupling between alkyl bromides and neopentylglycol (hetero)arylboronic esters. The protocol enabled efficient C-C bond formation with a host of nucleophiles and electrophiles (36 examples, 34-95%) with precatalyst loadings of 5 mol %. Studies with alkyl halide electrophiles that function as radical clocks support the intermediacy of alkyl radicals during the course of the catalytic reaction. The improved performance of the FI-cobalt catalyst was correlated with decreased lifetimes of cage-escaped radicals as compared to those of diamine-type ligands. Studies of the phenoxyimine-cobalt coordination chemistry validate the L,X interaction leading to the discovery of an optimal, well-defined, air-stable mono-FI-cobalt(II) precatalyst structure.
Influence of ferrocene and transition metals on the biological activities of Schiff bases
Shah, Faiz Ullah,Jamil, Maryam,Aslam, Javaria,Gul, Asghari,Akhter, Zareen,Mirza, Bushra
, p. 1112 - 1120 (2017/01/25)
A series of organic and organometallic Schiff bases bearing phenylferrocene and their six transition metal complexes have been prepared and tested for their potential biological applications by using antifungal, antibacterial, antitumor activities, toxici
The enhanced catalytic performance of cobalt catalysts towards butadiene polymerization by introducing a labile donor in a salen ligand
Gong, Dirong,Wang, Baolin,Jia, Xiaoyu,Zhang, Xuequan
, p. 4169 - 4178 (2014/03/21)
A family of cobalt complexes supported by a tridentate Schiff base ligand with a labile donor (O, S, N) as a pendant arm (Co1-Co12, formulated as CoL 2) were synthesized by the treatment of the corresponding ligands with cobalt acetate tetrahyd
Reactions of trimethylphosphane-supported cobalt complexes with salicylaldimines - Formation and structures of cobalt compounds containing salicylaldiminato [N:O] ligands
Li, Xiaoyan,Yu, Fengli,Sun, Hongjian,Huang, Liye,Hou, Haoqing
, p. 4362 - 4367 (2008/03/27)
The reactions of low-valent cobalt complexes CoMe(PMe3) 4, CoCl(PMe3)3 and Co(PMe3) 4 with salicylaldimines are described to give tetrahedral complexes 7-12, an octahedral complex 13 and a π-coordinated imine complex 15. The crystal structures of 13 and 15 are reported. The formation and likely mechanisms are discussed. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
Process for the preparation of alkylene glycols
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Page/Page column 3, (2008/06/13)
Disclosed is a process for the preparation of alkylene glycols from the corresponding alkylene oxide, such as ethylene glycol from ethylene oxide, in the presence of water, a catalyst and, optionally, carbon dioxide. The catalyst is a SALEN-type compound which contains an amino group and an oxy or hydroxy group connected by a hydrocarbon, such as an alkyl or an alkylaryl. The SALEN-type compounds may be Schiff bases, i.e., a condensate product of a primary amine with an aldehyde, ketone or an alcohol. The SALEN-type compound may be a mono or bis compound and may be complexed with a Group 4-14 metal, such as aluminum, tin, vanadium, chromium, manganese, iron, cobalt or platinum.
