magnetic susceptibility studies of all three complexes revealed antiferromagnetic coupling between the closely placed paramagnetic manganese ions mediated via a μ-oxo bridge. Cyclic voltammetry studies displayed both Mn(III)/Mn(II) and Mn(IV)/Mn(III) redox couples in 1 whereas only the Mn(III)/Mn(II) couple was observed for complexes 2 and 3. Importantly, complexes 2 and 3 were found to disproportionate
在这项工作中,我们提出两个μ的合成3 -氧桥连的混合价的三核锰II的Mn III复合物(1和2)和μ 4 -氧代桥连四锰II 4复合物(3)。这三种锰配合物均已通过结晶学和使用不同的分析技术进行了表征。混合价三核配合物1和2均表现出Mn(III) 离子。对所有三种配合物的可变温度磁化率研究表明,通过μ-氧代桥介导的紧密放置的顺磁性锰离子之间存在反铁磁耦合。循环伏安法研究显示两者的Mn(III)/锰(II)和Mn(IV)/锰(III中)的氧化还原对1,而仅将Mn(III)/锰(II中观察到)夫妇络合物2和3。重要的是,发现配合物2和3与H 2 O 2不成比例,过氧化氢酶的活性与其结构特征和氧化还原特性有关。
Hydroxide-bridged dicopper complexes: the influence of secondary coordination sphere on structure and catecholase activity
作者:Deepak Bansal、Rajeev Gupta
DOI:10.1039/c6dt04858g
日期:——
to them have been used for the synthesis of dicopper(II) complexes 1–6 having a Cu(μ-OH)Cu core. The crystalstructures of 1–6 show that while every Cu(II) ion is ligated within the N3 pincer cavity of a potentially multidentate ligand, two Cu(II) centers are bridged by a hydroxide group. Notably, the Cu(μ-OH)Cu core is encased within the secondary coordinationsphere intricately created by the appended
酰胺基配体(H 2 L 1–6)上附加有各种官能团,已用于合成具有Cu(μ-OH)Cu核的dicopper(II)配合物1-6。1–6的晶体结构表明,尽管每个Cu(II)离子都连接在一个潜在的多齿配体的N 3钳形腔内,但两个Cu(II)中心却被一个氢氧基团桥接。值得注意的是,Cu(μ-OH)Cu核被包裹在由附加基团复杂创建的次级配位球内。配合物1和2表现出在Cu(μ-OH)Cu核附近存在H键受体,配合物3和4显示在H原子附近存在H键供体以及H键受体基团Cu(μ-OH)Cu核。相比之下,配合物5和6在Cu(μ-OH)Cu核周围呈现修饰的二级配位球,其中5个中的H键相互作用基团有限,而6个中没有此类基团。我们表明,附加基团的氢键结合程度不仅调节Cu-OH键距,Cu(μ-OH)Cu角和Cu-Cu分离度,而且还调节Cu 2+ / Cu +氧化还原电位。所有六个复合物均具有氧化3,5-二叔丁基邻苯二
Selective turn-on sensing of fluoroquinolone drugs by zinc complexes of amide-based ligands
作者:Divya Prabha、Devender Singh、Rajeev Gupta
DOI:10.1007/s12039-021-01956-9
日期:2021.9
detection of fluoroquinolone antibiotics ciprofloxacin and norfloxacin. The two complexes exhibited high selectivity for norfloxacin with nanomolar detection limits of 290 and 460. The binding studies were further supported with the NMR spectroscopic and the molecular docking studies that exhibited that an antibiotic interacts with a zinc complex that was responsible for its emission enhancement based
Selective sensing of ATP by hydroxide-bridged dizinc(<scp>ii</scp>) complexes offering a hydrogen bonding cavity
作者:Deepak Bansal、Rajeev Gupta
DOI:10.1039/c9dt02404b
日期:——
This work illustrates the highlyselectivefluorescencedetection of ATP in the presence of other competing anions, such as AMP, ADP, PPi and other phosphates by using a set of hydroxide-bridged dizinc(ii) complexes offering a cavity lined with hydrogen bonds and other interactive forces. ATP, as a whole, was recognized by the synergic combination of Zn-phosphate bonding, ππ stacking between the adenine