2140-52-5Relevant articles and documents
Gold-Clip-Assisted Self-Assembly and Proton-Coupled Expansion–Contraction of a Cofacial FeIII–Porphyrin Cage
Wang, Yuanyuan,Ang, Pau Lin,Wong, Chun-Yuen,Yip, John H. K.
supporting information, p. 18623 - 18628 (2018/11/23)
A molecular cage {Au8(μ-PAnP)4[Fe(H2O)2(TPyP)]2(OTf)2}(OTf)8 (1) composed of two cofacial FeIII-porphyrin can be self-assembled from the gold clip [Au2(PAnP)Cl2] and Fe3+(H2O)2(TPyP)+ (PAnP=9,10-bis(diphenylphosphino)anthracene, TPyP=meso-tetra(4-pyridyl)porphyrinato). The height of the cage is 8.579(3) ?. The addition of a base to a solution of the cage leads to a contracted and twisted cage {[Au8(μ-PAnP)4[Fe2(μ-O)(TPyP)2]}(OTf)8 (2), which has a height of ≈4.4 ? and porphyrin–porphyrin torsional angle of ≈20°. The contracted cage can be synthesized independently from the gold clip and Fe2(μ-O)(TPyP)2. The spectroscopy and crystal structure of an unclipped analog of the contracted cage, {[AuPPh3)8[Fe2(μ-O)(TPyP)2]}(OTf)8 (3), supports the DFT-calculated structure of 2. NMR and UV/Vis titrations show that the expansion-untwisting and contraction-twisting of the cage is reversible.
The Kinetics of Growth of Metallo-supramolecular Polyelectrolytes in Solution
Munzert, Stefanie Martina,Stier, Simon P.,Schwarz, Guntram,Weissman, Haim,Rybtchinski, Boris,Kurth, Dirk G.
, p. 2898 - 2912 (2017/10/06)
Several transition metal ions, like Fe2+, Co2+, Ni2+, and Zn2+ complex to the ditopic ligand 1,4-bis(2,2′:6′,2′′-terpyridin-4′-yl)benzene (L). Due to the high association constant, metal-ion induced self-assembly of Fe2+, Co2+, and Ni2+ leads to extended, rigid-rod like metallo-supramolecular coordination polyelectrolytes (MEPEs) even in aqueous solution. Here, we present the kinetics of growth of MEPEs. The species in solutions are analyzed by light scattering, viscometry and cryogenic transmission electron microscopy (cryo-TEM). At near-stoichiometric amounts of the reactants, we obtained high molar masses, which follow the order Ni-MEPE≈Co-MEPEa reversible step-growth mechanism. The forward polymerization rate constants follow the order Co-MEPEFe-MEPENi-MEPE and the growth of MEPEs can be accelerated by adding potassium acetate.
METHOD FOR PRODUCING IRON CARBONATE
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Paragraph 0077; 0078; 0087; 0088, (2015/07/15)
The purpose of the present invention is to provide a method for producing an iron carbonate, whereby it becomes possible to prevent the generation of hydrogen during the production of the iron carbonate by the reaction of a carboxylic acid with metal iron. An embodiment of the present invention is a method for producing an iron carbonate by reacting metal iron with a carboxylic acid in a reaction solution, wherein a compound of trivalent iron is added to the reaction solution, the reaction solution contains a compound of trivalent iron at the time of the start of the reaction, the reaction solution contains a non-iron metal having a standard electrode potential of -2.5 to 0.1 inclusive or a metal compound containing the metal, or the reaction solution contains at least one metal selected from the group consisting of Ag, Bi and Pd or a metal compound containing the metal.