Liquid crystals of silver complexes derived from simple 1-alkylimidazoles
作者:Ching K. Lee、Kuang-Mei Hsu、Chun-Hsien Tsai、Chung K. Lai、Ivan J. B. Lin
DOI:10.1039/b314367h
日期:——
A homologous series of silver complexes of 1-alkylimidazoles (R-im, R = CnH2n+1, where n
= 10, 12, 14, 16 and 18) was synthesized. All the CnH2n+1-im ligands are non-mesomorphic. Upon complexation, all the [Ag(CnH2n+1-im)2][NO3], except for n
= 10, exhibit liquid crystalline properties. The crystal structure of [Ag(C12H25-im)2][NO3] shows that the silver center is two-coordinate and adopts a U-shaped conformation with bilayer packing. The non-mesomorphic [Ag(C16H33-bim)2][NO3]
(bim = benzimidazole) has a three-coordinate silver ion and has a chair conformation with monolayer stacking. Non-mesomorphic [Ag(C16H33-bim)2][BF4] has a linear geometry around the silver ion and also has a chair conformation. The mesophase for the Ag–(CnH2n+1-im) complexes has been identified as the smectic A (SmA) phase. [Ag(C16H33-im)2]+ with four different anions, NO3−, BF4−, PF6− and CF3SO3− were compared. Of the four Ag–im complexes, only that with the CF3SO3− anion does not show liquid-crystal behavior.
Au(i)-benzimidazole/imidazole complexes. Liquid crystals and nanomaterials
作者:S. J. Hsu、K. M. Hsu、Max K. Leong、Ivan J. B. Lin
DOI:10.1039/b717787a
日期:——
Three series of Au(I)-imidazole complexes with stoichiometries of [Au(Cn-bim)Cl], [Au(Cn-im)Cl], and [Au(Cn-im)2][NO3]·2H2O (Cn-bim = N–CnH2n+1-substituted benzimidazole and Cn-im = N–CnH2n+1-substituted imidazole) together with the compound of [Au(C18-bim)2][NO3] are synthesiszed. Typical structures of each series are determined by single crystal X-ray diffraction. The last series of compounds, are liquid crystals, and exhibit a wider mesophase range than their Ag(I) analogues. These Au(I) complexes form Au nanostructures both through chemical reduction or thermolysis. For the first time, N-long chain imidazole is utilized to stabilize colloidal Au in solution. Also for the first time, unique examples of simple thermolysis to produce large Au plates of nanothickness are demonstrated. Formation of a plate-like morphology through fusion of sphere-like nanoparticles at an early stage is evidenced by TEM images.
[EN] NON-COORDINATING ANION TYPE BENZIMIDAZOLIUM ACTIVATORS<br/>[FR] ACTIVATEURS DE BENZIMIDAZOLIUM DE TYPE ANION NON COORDONNANTS
申请人:EXXONMOBIL CHEMICAL PATENTS INC
公开号:WO2020219050A1
公开(公告)日:2020-10-29
The present disclosure provides benzimidazolium borate activators comprising benzimidazobum cations having linear alkyl groups, catalyst systems comprising, and processes for polymerizing olefins using such activators. Specifically, the present disclosure provides polymerization activator compounds which may be prepared in, and which are soluble in aliphatic hydrocarbon and alicyclic hydrocarbon solvents.
Non-Coordinating Anion Type Benzimidazolium Activators
申请人:ExxonMobil Chemical Patents Inc.
公开号:US20200339517A1
公开(公告)日:2020-10-29
The present disclosure provides benzimidazolium borate activators comprising benzimidazolium cations having linear alkyl groups, catalyst systems comprising, and processes for polymerizing olefins using such activators. Specifically, the present disclosure provides polymerization activator compounds which may be prepared in, and which are soluble in aliphatic hydrocarbon and alicyclic hydrocarbon solvents.
An oxidation catalyst composition is obtained by mixing a selenium compound, a nitrogen-containing aromatic compound and an acid, and if necessary, in the presence of a solvent. The oxidation catalyst composition shows an oxidation catalyst activity in the oxidation reaction of an organic compound. For example, at least one oxygen-containing compound selected from an alcohol compound, an aldehyde compound, a ketone compound and a carboxylic acid compound is obtained by reacting the olefin compound having two or more hydrogen atoms on the carbon atom at α-position of a carbon-carbon double bond with an organic hydroperoxide compound in the presence of the oxidation catalyst composition.