In the binuclear [(VO2)(2)(TPHPN)](+) cation of the title compound, [V2O4(C27H29N6O)]I.2H(2)O, the two tridentate halves of the symmetrical TPHPN- ligand are arranged so that the three donor N atoms are fac at one pseudo-octahedral metal centre but mer at the other. The strong trans influence of the oxo ligand is apparent from trends in the mu-V-O and V-N bond lengths.
Metallohydrolase biomimetics with catalytic and structural flexibility
作者:Luisa L. Mendes、Daniel Englert、Christiane Fernandes、Lawrence R. Gahan、Gerhard Schenk、Adolfo Horn
DOI:10.1039/c6dt03200a
日期:——
structural and functional properties of zinc(II) complexes of two nitrogen rich polydentate ligands, HTPDP = 1,3-bis(bis-pyridin-2-ylmethylamino)propan-2-ol and HTPPNOL = N,N,N′-tris-(2-pyridylmethyl)-1,3-diaminopropan-2-ol, are compared. HTPDP is a hepta-dentate ligand with four pyridyl groups attached to a 1,3-diaminopropan-2-ol backbone while HTPPNOL contains only three pyridyl groups. In reactions with
molecule in an asymmetric unit, whereas 2b contains four distinct molecules in an asymmetric unit. Crystalstructures showed that all the dinuclear complex cations in 2a and 2b consist of two distinct iron centers which are triply bridged by the alkoxide oxygen of tpdb and two benzoate groups. The FeIII ion tends, preferentially, to occupy a site which has a five-membered chelate ring in the bridging skeleton
合成了一系列双金属配合物[M a II M b III(L)(C 6 H 5 CO 2)2 ](ClO 4)2(2,L = tpdb,M a = M b = Fe; 3,L = Me 4 -tpdb,M a = M b = Fe;4,L = tpdb,M a = Fe,M b = Ga;5,L = tpdb,M a = Zn,M b = Fe; tpdb = N,N,N',N'-四(2-吡啶基甲基)-1,4-二氨基丁烷-2-油酸酯和Me 4 -tpdb = N,N,N',N'-四[2-(6-甲基吡啶基)甲基] -1,4-二氨基丁烷-2-油酸酯)。这些成核配体提供了一个不对称的桥联键,该桥键在两个金属中心生出,在桥联骨架中形成五元和六元螯合环。配合物2提供了适用于X射线分析的两种类型的晶体(2a(2 ·3CH 3 CN)和2b(2 ·1.5H 2 O))。2a在具有晶胞参数的P 2 1 2 1
Dinuclear Zn<sup>2+</sup>complexes in the hydrolysis of the phosphodiester linkage in a diribonucleoside monophosphate diester
Dizinc complexes that were formed from 2 ∶ 1 mixtures of Zn(NO3)2 and dinucleating ligands TPHP (1), TPmX (2) or TPpX (3) in aqueous solutions efficiently hydrolyzed diribonucleoside monophosphate diesters (NpN) under mild conditions. The dinucleating ligand affected the structure of the aquo-hydroxo-dizinc core, resulting in different characteristics in the catalytic activities towards NpN cleavage. The pH-rate profile of ApA cleavage in the presence of (Zn2+)2-1 was sigmoidal, whereas those of (Zn2+)2-2 and (Zn2+)2-3 were bell-shaped. The pH titration study indicated that (Zn2+)2-1 dissociates only one aquo proton (up to pH 12), whereas (Zn2+)2-2 dissociates three aquo protons (up to pH 10.7). The observed differences in the pH-rate profile are attributable to the various distributions of the monohydroxo-dizinc species, which are responsible for NpN cleavage. As compared to that using (Zn2+)2-1, the NpN cleavage using (Zn2+)2-2 showed a greater rate constant, with a higher product ratio of 3′-NMP/2′-NMP. The saturation behaviors of the rate, with regard to the concentration of NpN, were analyzed by Michaelis–Menten type kinetics. Although the binding of (Zn2+)2-2 to ApA was weaker than that of (Zn2+)2-1, (Zn2+)2-2 showed a greater kcat value than (Zn2+)2-1, resulting in higher ApA cleavage activity of the former.
Agent for capturing substance having anionic substituent
申请人:Koike Tohru
公开号:US20060131239A1
公开(公告)日:2006-06-22
A polymer carrier to which a prescribed zinc complex group is binding directly or through a spacer, having property to bond, under a certain condition, to an anionic substituent (a phosphate group, for example), showing low solubility to a solvent (preferably insolubility to a solvent) as a whole, and being capable of capturing, separating and purifying easily a substance having an anionic substituent (a phosphate group, for example).
Polyacrylamide gel for electrophoresis, polyacrylamide gel electrophoresis method using the same, method of producing the same, and acrylamide compound
申请人:Koike Tohru
公开号:US20100108515A1
公开(公告)日:2010-05-06
It is intended to provide a method for easily detecting a phosphopeptide (protein) in a test sample by using SDS-poly-acrylamide gel electrophoresis (SDS-PAGE) which has been employed in analyzing a protein, a polyacrylamide gel for electrophoresis to be used in the above method, a method of producing the gel and an intermediate in synthesizing the gel. The polyacrylamide gel for electrophoresis to be used in the above method has a structure represented by the following general formula (I) in at least a part of the structure thereof: (I) wherein M
2+
represents a transition metal ion; and X represents a linker.