New chiral pyridine-based Eu(III) complexes: Study of the relationship between the nature of the ligands and the 5D0 luminescence spectra
摘要:
In this paper a new family of imines [N,N'-bis(2-pyridylmethylidene)-1,2-(R,S)-cyclohexanediamine (ligand 1); N,N'-bis(2-pyridylmethylidene)-1,2-(R,S)-cyclohexanediamine (ligand 3)] and amines [N,N'-bis(2-pyridylmethylene)- 1,2-(R,R + S,S)-cyclohexanediamine (ligand 2); N,N'-bis(2-pyridylmethylene)-1,2-(R,S)-cyclohexanediamine (ligand 4)] pyridine-based chiral ligands and their chiral nitrate Eu(III) complexes is presented. Combination of structural and spectroscopic evidences in the solid state, reveals that the Eu(III) ion environment is characterized by a low symmetry for all the complexes. The D-5(0) -> F-7(0) Eu(III) emission intensity reflects the degree of distortion of the metal surroundings, that is higher in the case of cis isomer of amine-based complex. This new family of Eu(III) chiral complexes are promising candidates for applications in the sensing field as probes in solution of the nitrate anion and of chiral molecules. (C) 2011 Elsevier B.V. All rights reserved.
C–H Oxidation by H<sub>2</sub>O<sub>2</sub> and O<sub>2</sub> Catalyzed by a Non-Heme Iron Complex with a Sterically Encumbered Tetradentate N-Donor Ligand
作者:Qiao Zhang、John D. Gorden、Christian R. Goldsmith
DOI:10.1021/ic402501k
日期:2013.12.2
substrates, the neopentyl groups destabilize the metal-based oxidants generated from H2O2 and the Fe(II) complex. The presence of benzylic substrates with weak C–H bonds stabilizes an intermediate which we have tentatively assigned as a high-spin ferric hydroperoxide species. The oxidant generated from O2 reacts with allylic and benzylic C–H bonds in the absence of a sacrificial reductant; less substrate
的化合物Ñ,N' -dineopentyl- Ñ,Ñ ' -双(2-吡啶基甲基)-1,2-乙二胺(dnbpn)及其亚铁复杂的[Fe(dnbpn)(OTF)2 ]合成的。Fe(II)络合物用于催化H 2 O 2和O 2氧化烃。尽管H 2 O 2催化了烷烃的氧化与大多数先前报道的非血红素铁催化剂相关的那些相比,对叔碳显示出对仲碳而不是叔碳的更高的偏好,催化活性显着降低。除了将催化的氧化导向底物的较少拥挤的C–H键外,新戊基还使由H 2 O 2和Fe(II)络合物生成的金属基氧化剂不稳定。具有弱C–H键的苄基底物的存在稳定了一种中间体,我们暂时将其定为高纺氢过氧化铁物种。由O 2产生的氧化剂在不存在牺牲性还原剂的情况下与烯丙基和苄基CH键反应;与使用O 2作为末端氧化剂的相关先前描述的系统相比,观察到的底物脱氢更少。
Catalytic oxyfunctionalization of saturated hydrocarbons by non-heme oxo-bridged diiron(III) complexes: role of acetic acid on oxidation reaction
作者:Uday Sankar Agarwalla
DOI:10.1007/s11243-020-00412-w
日期:2020.11
Oxo-bridged diiron(III) complexes [Fe2O(L 1 ) 2 (H 2O) 2 ](ClO 4 ) 4 ( 1 ) and [Fe2O(L 2 ) 2 (H 2O) 2 ](ClO 4 ) 4 ( 2 ), where L 1 and L 2 are tetradentate N -donor N , N ′-bis(2-pyridylmethyl)-1,2-cyclohexanediamine and N , N ′-bis(2-pyridylmethyl)ethane-1,2-diamine respectively, have been isolated as synthetic models of non-heme iron oxygenases and characterized by physicochemical and spectroscopic
Chiral metal complexes 41. Stereoisomerism in palladium(II) complexes of a series of chiral bis-picolyl N4-tetradentate ligands
作者:Ronald R. Fenton、Frederick S. Stephens、Robert S. Vagg、Peter A. Williams
DOI:10.1016/0020-1693(94)04341-r
日期:1995.3
N-Dialkylation of these ligands results in complex mixtures containing two diastereoisomers, with each minor component having C1 symmetry. Complexes of meso forms of the tetradentates are obtained as isomeric mixtures which vary with the degree and nature of ligand substitution. The X-ray diffraction analysis of two representative complexes is reported. [N,N′-Di(2-picolyl)-N-methyl-2S-amino-methylpyrrolidine]
Chiral metal complexes. 25. Cobalt(III) complexes of some linear mesomeric tetramine ligands
作者:Ronald R. Fenton、Robert S. Vagg、Paul Jones、Peter A. Williams
DOI:10.1016/s0020-1693(00)86549-4
日期:1987.4
chiral species, chiroptical techniques. In the various β complexes, the tetradentate is observed to adopt either the exo or endo geometry, specifically. Factors which influence coordination geometry include steric interactions and hydrophobic bonding effects. A number of chemical transformations between dinitro and dichloro complexes of Co(III) with R,S - picbn have been examined, as has the reaction
EQUILIBRATED DYNAMIC MIXTURES TO CONTROL THE RELEASE OF PERFUMING ALDEHYDES AND KETONES
申请人:Herrmann Andreas
公开号:US20140038873A1
公开(公告)日:2014-02-06
The present invention concerns a dynamic mixture obtained by combining, in the presence of water, at least one diamine derivative, comprising at least one heteroaryl moiety, with at least two perfuming aldehydes and/or ketones. The invention's mixture is capable of releasing in a controlled and prolonged manner said perfuming compounds, in particular perfuming ingredients, into the surrounding environment. The invention's dynamic mixture gives rise to a more evenly distributed positive effect for the release of the different carbonyl compounds which are part of the mixture than other examples reported in the prior art.