Komplexone XXIII. Der Phenolatsauerstoff als Koordinationspartner
作者:G. Schwarzenbach、G. Anderegg、R. Sallmann
DOI:10.1002/hlca.19520350602
日期:1952.8.1
Phenol derivatives carrying in o-position to OH the groupment: CH2N(CH2COOH)2 are capable of forming metal complexes even with alcaline earth metals. The stability of these complexes is similar in magnitude to the stability of the complexes of nitrilo-triacetic acid.
Structures of binuclear and tetranuclear iron(III) complexes as models for ferritin core formation
作者:Bruce P. Murch、Paul D. Boyle、Lawrence Que
DOI:10.1021/ja00309a061
日期:1985.11
Determination des structures cristallines des 2 complexes [Fe 2 L(OH)(H 2 O) 2 ] et [Fe 4 L 2 O 2 (OH) 2 ][C 4 H 10 N] 4 avec L=N,N'-(hydroxy-2 methyl-5 xylylene-1,3) bis(N-carboxymethyl glycine)
[Fe 2 L(OH)(H 2 O) 2 ] et [Fe 4 L 2 O 2 (OH) 2 ][C 4 H 10 N] 4 avec L=N,N'- (hydroxy-2methyl-5 xylylene-1,3) 双(N-羧甲基甘氨酸)
A biomimetic cerium-based biosensor for the direct visual detection of phosphate under physiological conditions
作者:Thibaud Rossel、Marc Creus
DOI:10.1039/c9cc04840e
日期:——
used to probe phosphate ions in an aqueous medium at neutral pH using a dinuclear cerium based complex [Ce2(HXTA)]3+. The homoleptic complex can be used to detect phosphate ions with nanomolar affinity either spectrophotometrically or with the naked-eye. To our knowledge, this is the first dinuclear cerium biomimetic IDA detection system with the highest affinity known to date for selective, naked-eye
The dinuclear diruthenium complexes ligated by the (µ-aryloxo)bis(µ-carboxylato) system M[Ru2L(µ-O2CR)2] (M = Na, R = Me 1; M = Na, R = Ph 2; M = K, R = Me 3; M = K, R = Ph 4; H5L = 2-hydroxy-5-methyl-m-phenylenedimethylenedinitrilotetraacetic acid) were prepared by the reaction of [RuCl2(Me2SO)4] with L5– and carboxylic acid. The structure of the benzoate-bridged complex 4·0.5MeOH·0.5EtOH·4H2O was elucidated by X-ray crystallography. The Ru· · ·Ru distance was 3.416 Å (average for two crystallographically independent molecules), comparable to those of (µ-alkoxo)bis(µ-carboxylato)diruthenium complexes. The magnetic properties were analysed by a general isotropic exchange Hamiltonian H = –2JS1·S2 (S1 = S2 = ½), yielding meaningfully large antiferromagnetic spin coupling constants (–J = 728 and 649 cm–1 for 1 and 2, respectively). The cyclic voltammogram of 4 in dmf demonstrated two reduction and one oxidation wave corresponding to the four redox states RuII2, RuIIRuIII, RuIII2, RuIIIRuIV. The intervalence coupling constant KC estimated from the potential gap between RuII2/RuIIRuIII and RuIIRuIII/RuIII2 indicated that the introduction of the µ-aryloxo bridge stabilizes the RuIIRuIII mixed-valence species.
由 (µ-aryloxo)bis(µ-carboxylato) 系统 M[Ru2L(µ-O2CR)2] (M = Na, R = Me 1; M = Na, R = Ph 2; M = K, R = Me 3;M=K,R=Ph 4;H5L=2-羟基-5-甲基-间苯二胺四乙酸)是通过[RuCl2(Me2SO)4]与 L5-和羧酸反应制备的。苯甲酸桥接复合物 4-0.5MeOH-0.5EtOH-4H2O 的结构通过 X 射线晶体学得以阐明。Ru - -Ru 间距为 3.416 Å(两个晶体学上独立分子的平均值),与 (µ-alkoxo)bis(µ-carboxylato)diruthenium 复合物的间距相当。磁性由一般各向同性交换哈密顿 H = -2JS1-S2(S1 = S2 = ½)分析,得出了有意义的大反铁磁自旋耦合常数(1 和 2 的 -J = 728 和 649 cm-1)。4 在 dmf 中的循环伏安图显示了两个还原波和一个氧化波,分别对应于四种氧化还原态 RuII2、RuIIRuIII、RuIII2 和 RuIIIRuIV。根据 RuII2/RuIIRuIII 和 RuIIRuIII/RuIII2 之间的电位差估算出的间隔耦合常数 KC 表明,μ-芳香桥的引入稳定了 RuIIRuIII 混合电价物种。
Highly Selective Isomerization of Glucose into Fructose Catalyzed by a Mimic Glucose Isomerase
isomerase to catalyze the isomerization of glucose into fructose. The mimic enzyme displayed excellent catalytic activity for isomerization of glucose to fructose under mild conditions. The yield of fructose and selectivity of fructose could reach 33.0 % and 93.5 % after reacting 4 h, respectively, at pH 8.5 and 80 °C. The catalysis reaction rateconstant kcat and Michaelis constants KmG, KmF were