with no easily substituted ligand. On the other hand, other Fe(II) complexes with unsaturated coordination or an easily substituted ligand had high SOD activity (IC50=0.4–20 μM). The results indicate that the substitution reaction of a ligand with superoxide or the coordination of superoxide is essential for Fe(II)TPEN analogue complexes to have SOD activity. Moreover, we examined the effect of steric
Convenient Synthesis of<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetrakis (2-pyridylmethyl)-α,ω-alkanediamines Using a Phase-Transfer Catalyst
作者:Masaru Sato、Yutaka Mori、Takeaki Iida
DOI:10.1055/s-1992-26157
日期:——
Alkylation of α,Ï-alkanediamines and their N,N′-disubstituted derivatives with 2-(chloromethyl)pyridinium chloride in the presence of hexadecyltrimethylammonium chloride as a phase-transfer catalyst gave conveniently the corresponding N,N,N′,N′-tetrakis (2-pyridylmethyl)-α,Ï-alkanediamines in good yields. N,N′-Bis(2-pyridylmethyl)-N,N′-bis (2-thienylmethyl)-1,2-ethanediamine was similarly obtained.
Cooperative Interactions in the Second Coordination Sphere of Pyridazine/Pyridine Containing Polyazaheterocyclic Iron(II) Complexes Favor Protonation
作者:Ahmad Hammoud、Jean‐Boris Nshimyumuremyi、Jérémie Bourotte、Fabio Lucaccioni、Koen Robeyns、Marinela M. Dîrtu、Yann Garcia、Michael L. Singleton
DOI:10.1002/ejic.201800533
日期:2018.7.23
confirmed by NMR and X‐ray crystallographic studies. For 1–3, the ligands bind in a hexadentate fashion giving similar octahedral structures with an N6 coordination environment. Across the series, the increasing number of pyridazines has only modest effects on the spectroscopic and electrochemical properties of the metal. Nevertheless, their reactivitytowardsprotonation is drastically different. While 2 and
Thermodynamic and kinetic study of the interaction between the Pt(<scp>ii</scp>) centres in [Pt<sub>2</sub>(N,N,N′,N′-tetrakis(2-pyridylmethyl)diamine)(H<sub>2</sub>O)<sub>2</sub>]<sup>4+</sup>. Influence of the bridging ligand
作者:Andreas Hofmann、Rudi van Eldik
DOI:10.1039/b305174a
日期:——
higher reaction rates and a decrease in ΔH‡. In addition, the reactivity of one Pt(II) centre shows a clear dependence on the nature of the other Pt(II) centre, leading to different thermodynamic and kinetic properties for the first and second reaction steps. The interaction between the two Pt(II) centres mainly depends on the Pt–Pt distance and not on the aromatic or aliphatic nature of the bridging diamine
Carbonyl Complexes of Rhodium with N-Donor Ligands: Factors Determining the Formation of Terminal versus Bridging Carbonyls
作者:Wojciech I. Dzik、Charlotte Creusen、René de Gelder、Theo P. J. Peters、Jan M. M. Smits、Bas de Bruin
DOI:10.1021/om901023n
日期:2010.4.12
with 50 bar of CO leads to only partial conversion (∼15%) to the tris-carbonyl-bridged species [Rh2(κ3-Bu-bpa)2(μ-CO)3]2+ (62+). Stabilization of tris-carbonyl bridges can be achieved by cooperative binding. Tethering two bpa moieties with a propylene linker allows cooperative CO binding to [(CO)Rh(μ-(bis-κ3)tppn)Rh(CO)]2+, producing the tetranuclear complex [Rh4(μ-(bis-κ3)tppn)2((μ-CO)3)2]4+ (13)4+ at