Oxygen activation at a dicobalt centre of a dipyridylethane naphthyridine complex
作者:Casey N. Brodsky、Guillaume Passard、Andrew M. Ullman、David E. Jaramillo、Eric D. Bloch、Michael Huynh、David Gygi、Cyrille Costentin、Daniel G. Nocera
DOI:10.1039/c8dt01598h
日期:——
reduction. Variable-temperature 1H NMR and SQUID magnetometry reveal the reduced dicobalt(II,II) intermediate to consist of two low spin Co(II) centers coupled antiferromagnetically. Binding of O2 to the open coordination site of the dicobalt(II,II) core results in the production of an oxygen adduct, which is proposed to be a dicobalt(III,III) peroxo. Electrochemical studies show that the addition of two electrons
通过合成方法分离反应中间体,探索了二钴双-μ-羟基核心的氧活化机理。通过两个电子还原被聚吡啶基配体二吡啶基乙烷萘啶(DPEN)连接的二叶甲(III,III)核,随后质子化导致一个水部分的释放,从而为具有双键的开放式结合位点提供二叶甲(II,II)中心。该还原的核可以通过化学还原独立地分离。可变温度1 H NMR和SQUID磁力分析显示还原的二钴(II,II)中间体由两个低自旋Co(II)反铁磁耦合的中心。O 2与麦草双(II,II)核的开放配位位点的结合导致产生氧加合物,该氧加合物被提议为麦草双(III,III)过氧。电化学研究表明,两个电子的相加会导致O–O键断裂。
Probing Edge Site Reactivity of Oxidic Cobalt Water Oxidation Catalysts
作者:Andrew M. Ullman、Casey N. Brodsky、Nancy Li、Shao-Liang Zheng、Daniel G. Nocera
DOI:10.1021/jacs.6b00762
日期:2016.3.30
consistent with the OER activity of Co-OEC in Bi and Pi. The Pi bindingkinetics are too slow to establish a pre-equilibrium sufficiently fast to influence the oxygen evolution reaction (OER), consistent with the zero-order dependence of Pi on the OER current density; in contrast, Bi exchange is sufficiently facile such that Bi has an inhibitory effect on OER. These complementary studies on Co-OEC and the dicobalt
Dinucleating Naphthyridine-Based Ligand for Assembly of Bridged Dicopper(I) Centers: Three-Center Two-Electron Bonding Involving an Acetonitrile Donor
作者:Timothy C. Davenport、T. Don Tilley
DOI:10.1002/anie.201106081
日期:2011.12.16
Unusual bonding: A ligand system that promotes formation of a rare μ‐η1:η1 acetonitrile‐bridged dicopper(I) complex (see picture) has been developed. The acetonitrile ligand is involved in a three‐center two‐electron bond supported by a cuprophilic interaction. The labile acetonitrile ligand can be substituted with xylyl isocyanide or CO.
Room-Temperature Characterization of a Mixed-Valent μ-Hydroxodicopper(II,III) Complex
作者:James A. Isaac、Federica Gennarini、Isidoro López、Aurore Thibon-Pourret、Rolf David、Gisèle Gellon、Béatrice Gennaro、Christian Philouze、Franc Meyer、Serhiy Demeshko、Yves Le Mest、Marius Réglier、Hélène Jamet、Nicolas Le Poul、Catherine Belle
DOI:10.1021/acs.inorgchem.6b01504
日期:2016.9.6
Bis(μ-hydroxo)dicopper(II,II) bearing a naphthyridine-based ligand has been synthesized and characterized in the solid state and solution. Cyclic voltammetry at room temperature displays a reversible redox system that corresponds to the monoelectronic oxidation of the complex. Spectroscopic and time-resolved spectroelectrochemical data coupled to theoretical results support the formation of a charge-localized