Lewis Acid-Induced Change from Four- to Two-Electron Reduction of Dioxygen Catalyzed by Copper Complexes Using Scandium Triflate
作者:Saya Kakuda、Clarence J. Rolle、Kei Ohkubo、Maxime A. Siegler、Kenneth D. Karlin、Shunichi Fukuzumi
DOI:10.1021/ja512584r
日期:2015.3.11
the peroxo-bridged dicopper(II) complex [(tmpa)Cu(II)(O2)Cu(II)(tmpa)](2+), the two-electron reduced product of O2 with Sc(3+) is observed to be scandium peroxide ([Sc(III)(O2(2-))](+)). In the presence of 3 equiv of hexamethylphosphoric triamide (HMPA), [Sc(III)(O2(2-))](+) was oxidized by [Fe(bpy)3](3+) (bpy = 2,2-bipyridine) to the known superoxide species [(HMPA)3Sc(III)(O2(•-))](2+) as detected
Significant differences in the biological activity of mononuclear Cu(<scp>ii</scp>) and Ni(<scp>ii</scp>) complexes with the polyquinolinyl ligand
作者:Jun-Ling Li、Lin Jiang、Bi-Wei Wang、Jin-Lei Tian、Wen Gu、Xin Liu、Shi-Ping Yan
DOI:10.1039/c4nj00876f
日期:——
The difference in the redox activity of metal ions Cu(ii) and Ni(ii) results in some discrepancy in the biological activity of their complexes.
金属离子Cu(II)和Ni(II)的氧化还原活性差异导致它们的配合物在生物活性上存在一些差异。
Dioxygen Binding to Complexes with Fe<sup>II</sup><sub>2</sub>(μ-OH)<sub>2</sub> Cores: Steric Control of Activation Barriers and O<sub>2</sub>-Adduct Formation
作者:Sergey V. Kryatov、Sonia Taktak、Ivan V. Korendovych、Elena V. Rybak-Akimova、József Kaizer、Stéphane Torelli、Xiaopeng Shan、Sanjay Mandal、Vicki L. MacMurdo、Antoni Mairata i Payeras、Lawrence Que
DOI:10.1021/ic0485312
日期:2005.1.1
series of complexes with [Fe(II)(2)(mu-OH)(2)] cores has been synthesized with N3 and N4 ligands and structurally characterized to serve as models for nonheme diiron(II) sites in enzymes that bind and activate O(2). These complexes react with O(2) in solution via bimolecular rate-limiting steps that differ in rate by 10(3)-fold, depending on ligand denticity and sterichindrance near the diiron center.
A highly selective quinoline-based fluorescent sensor for Zn(II)
作者:Hyun Kim、Juhye Kang、Kyung Beom Kim、Eun Joo Song、Cheal Kim
DOI:10.1016/j.saa.2013.09.118
日期:2014.1
A quinoline-based simple receptor (bis(2-quinolinylmethyl)benzylamine = 1) as a Zn2+ selective fluorescent chemosensor showed a large fluorescent enhancement with a blue shift in the presence of Zn2+ which is attributed to a chelation enhanced fluorescence (CHEF) effect with inhibition of a photoinduced electron transfer (PET) process of 1. In particular, this receptor could clearly distinguish Zn2+ from Cd2+. The binding mode of 1 and Zn2+ was found to be a 1:1 and confirmed by Job plot, H-1 NMR titration and ESI-mass spectrometry analysis. (C) 2013 Elsevier B.V. All rights reserved.