Selective direct hydroxylation of benzene to phenol with hydrogen peroxide by iron and vanadyl based homogeneous and heterogeneous catalysts
作者:Liliana Carneiro、Ana Rosa Silva
DOI:10.1039/c6cy00970k
日期:——
first row transition metal complexes with Schiff base ligands or with readily available acetylacetonate ligands were screened as homogeneous catalysts in the challenging direct hydroxylation of benzene to phenol under mild conditions. Phenol was the main product of the oxidation of benzene in acetonitrile at 50 °C using hydrogenperoxide as the oxidant. The Fe(II/III) complexes with Schiff base ligands
Oxidation of cyclohexane by transition-metal complexes with biomimetic ligands
作者:Ana Rosa Silva、Teresa Mourão、João Rocha
DOI:10.1016/j.cattod.2012.07.043
日期:2013.3
transition metal complexes are characterized by elemental analysis, high resolution ESI mass spectrometry, FTIR and UV–vis. Cyclohexanone and cyclohexanol are the main products of the oxidation of cyclohexane, obtained when the following complexes are used as homogeneous catalysts in only 1 mol% based on the substrate: VO(IV), Fe(III) and Cu(II) complexes with the N2O2 Schiff base, newFe(II) complex with the
这项工作报告第一行(V(IV),Mn(III),Fe(III)Co(III)和Cu(II))的仿金属席夫碱在均相中的催化活性。用N配体2 ö 2配位层,以及作为N 4铁(Fe(II)),在使用对环境无害的试剂环己烷的室温氧化:过氧化氢(30重量%)作为氧源和乙腈作为溶剂。硝酸还用作氧化反应的促进剂。FTIR证实了配体的结构11 H NMR和高分辨率ESI质谱。相应的过渡金属络合物的特征在于元素分析,高分辨率ESI质谱,FTIR和UV-vis。环己酮和环己醇是环己烷氧化的主要产物,当以下配合物用作均相催化剂时,仅占基质的1 mol%:VO(IV),Fe(III)和Cu(II)与N 2 O 2 Schiff碱,新的Fe(II)配合物,其Schiff碱具有N 4配位域,商用[VO(acac)2 ]具有O 4配位域。具有N 2 O 2的Fe(III)络合物Schiff碱配体([Fe(salhd)C
A novel blue-emitting indium(III) complex: Synthesis, crystal structure, and effect of solvents and temperature on the luminescent properties
作者:Shuo Chen、Ruiqing Fan、Xinming Wang、Yulin Yang
DOI:10.1016/j.inoche.2014.03.006
日期:2014.6
exists in CH3OH (467 nm) solution. An extended work is developed to discuss on maximum emission and lunminescent lifetime of 1 dispersed in the deuterated reagents (CD3OD, CDCl3, CD3CN and DMSO-d6). The results exhibit that the similar emission also exists in deuterated reagents and the longer lifetime is observed due to the scarcity of OH, N H, and C H oscillators. The quantumyield of 1 decreases with
MnII complexes with tetradentate N4 ligands: Highly efficient catalysts for the epoxidation of olefins with H2O2
作者:Songjie Yu、Cheng-Xia Miao、Daqi Wang、Shoufeng Wang、Chungu Xia、Wei Sun
DOI:10.1016/j.molcata.2011.11.024
日期:2012.2
A series of Mn-complexes with tetradentate N-4 ligands, introducing aromatic groups into 2-pyridylmethyl positions of N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)ethane-1,2-diamine (mep), N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)cyclohexane-trans-diamine (mcp), have been synthesized and applied for epoxidation of olefins using H2O2 as the oxidant. The Mn-complexes still possessed an octahedral mononuclear structure in a cis-alpha topology. These complexes showed good regioselectivity, high yields and turnover frequency (even up to 228,000 h(-1)) with low catalyst loading (0.1-0.01 mol%) for epoxidation of a family of olefins (including internal aromatic olefins, internal and terminal aliphatic olefins and diolefins). (C) 2011 Elsevier B.V. All rights reserved.
Europium (III) complexes with new N-donor ligand: A comparative study in solid state and solution
In this paper a pyridine-based racemic ligand [N,N'-bis(2-pyridylmethylidene)-1,2-(R,R + S,S)-cyclohexanediamine], 1, and its new trifluoromethansulfonate (CF3SO3-, triflate) and nitrate Eu(III) complexes were studied, both in the solid state and in acetonitrile (AN) solution. In the case of the triflate complexes, a combination of structural and spectroscopic evidences, revealed the different nature of the species in solution and in the solid state. On the contrary, the nitrate adduct in the solid state presented similar features as the complex present in AN solution. All triflate and nitrate complexes detected in solution are highly stable. (C) 2013 Elsevier Ltd. All rights reserved.