Zn(II) Complexes with Quinoline Supported Amidate Ligands: Synthesis, Fluorescence, and Catalytic Activity
摘要:
Zn(II) complexes of N-(quinolin-8-yl)picolinamide (HL1) (1) and N-2,N-6-di(quinolin-8-yl)pyridine-2,6-dicarboxamide (H2L2) (2) have been synthesized by deprotonation of the ligands and characterized by IR, NMR, and Single crystal X-ray crystallography. The mononuclear [Zn(L-1)(2)] (3) and homodinuclear [Zn-2(L-2)(2)] (4) complexes are characterized by distorted octahedral geometries stabilized by hydrogen bonding and weak pi center dot center dot center dot pi interaction. The complexes demonstrate intense fluorescence bands in comparison with their corresponding ligands with well-distinguished intensity. The complexes act as efficient catalysts in various transesterification reactions. Among those, the best results have been achieved with complex 3 in conversion of 4-nitrophenylacetate into methyl acetate within 3 h.
阿尔茨海默病 (AD) 是一种中枢神经系统的神经退行性疾病。主要的病理生理机制涉及胆碱能神经传递、β-淀粉样蛋白 (Aβ) 和 Tau 蛋白、几种金属离子和氧化应激等。目前的药物只能缓解症状,不能治愈 AD。越来越多的证据表明,针对多种病理生理机制的多功能化合物可能具有治疗 AD 的巨大潜力。在这项研究中,我们报告了四种基于喹啉的金属螯合剂及其各自的铜 (II) 配合物的合成和物理化学表征。大多数化合物在浓度≤5 μM 时是无毒的。在使用未分化和分化的 SH-SY5Y 细胞的神经保护研究中,金属螯合剂N 2, N 6 -di(quinolin-8-yl)pyridine-2,6-dicarboxamide (H 2 dqpyca) 似乎对 Aβ 肽和 H 2 O 2诱导的毒性具有显着的神经保护作用。铜 (II) 络合物 [Cu II (H 2 bqch)Cl 2 ] 。3H 2 O (H 2
2,6-Bis[<i>N</i>-(8-quinolyl)carbamoyl]pyridine as a Highly Selective Extractant for Cu(II)
作者:Kazuhisa Hiratani、Kazuhiro Taguchi
DOI:10.1246/bcsj.63.3331
日期:1990.11
Pyridinederivatives containing two 8-quinolyl-amino groups were newly synthesized for heavy metal ion-cheletion. It was shown in solventextraction that 2, 6-bis[N,N′-(8-quinolyl)aminocarbonyl]pyridine can extract only Cu(II) with excellent selectivity and efficiency from the aqueous phase(pH 6.2) containing Cu(II), Ni(II), Co(II), and Zn(II) into the chloroform phase.
New (Iso)quinolinyl-pyridine-2,6-dicarboxamide G-Quadruplex Stabilizers. A Structure-Activity Relationship Study
作者:Enrico Cadoni、Pedro R. Magalhães、Rita M. Emídio、Eduarda Mendes、Jorge Vítor、Josué Carvalho、Carla Cruz、Bruno L. Victor、Alexandra Paulo
DOI:10.3390/ph14070669
日期:——
(G4)-interactive smallmolecules have a wide range of potential applications, not only as drugs, but also as sensors of quadruplex structures. The purpose of this work is the synthesis of analogues of the bis-methylquinolinium-pyridine-2,6-dicarboxamide G4 ligand 360A, to identify relevant structure–activity relationships to apply to the design of other G4-interactive smallmolecules bearing bis-quinoline
Probing the equilibrium between mono- and di-nuclear nickel(II)-diamidate {[NiII(DQPD)]x, x = 1,2} complexes in chloroform solutions by combining acoustic and vibrational spectroscopies and molecular orbital calculations
equilibrium. The absorption results demonstrate the existence of a relaxation process which is attributed to the perturbation by the sound wave of an equilibrium between mono-nuclear and di-nuclear complexes. The enthalpy difference between the two states is also evaluated from the analysis of the acoustic results. The acoustically induced birefringence traces (stationary and transient) were also employed
在这项工作中,通过将振动和超声光谱与分子轨道计算相结合进行了系统研究,以期全面了解 [Ni II (DQPD)] x配合物在固态和氯仿溶液。振动光谱揭示 (i)在固态下形成单核 Ni II 配合物和 (ii) 形成两种不同类型的 Ni II氯仿溶液中的络合物。浓度相关的振动光谱测量表明,在低浓度时,单核复合物占主导地位,而在高浓度极限时,双核在结构中比比皆是。光谱的温度依赖性显示出与浓度完全相反的行为。我们提出了单核和双核复合物之间的二聚平衡,以解释观察到的光谱变化。二聚反应的能量分布在理论上确定,表现出 [Ni II 2 (DQPD) 2] 双核配合物是最热力学有利的。超声波弛豫光谱已被用于建立所提出的二聚平衡。吸收结果表明存在弛豫过程,该弛豫过程归因于单核和双核配合物之间平衡的声波扰动。两种状态之间的焓差也通过声学结果的分析来评估。声诱导双折射轨迹(静止和瞬态)也被用来检查 Ni II
Electrocatalytic hydrogen production by dinuclear cobalt(<scp>ii</scp>) compounds containing redox-active diamidate ligands: a combined experimental and theoretical study
作者:Michael G. Papanikolaou、Alexander Elliott、James McAllister、John K. Gallos、Anastasios D. Keramidas、Themistoklis A. Kabanos、Stephen Sproules、Haralampos N. Miras
DOI:10.1039/d0dt02617d
日期:——
(4). Homovalent 1 and 2 exhibited catalyticactivity towards proton reduction in the presence of acetic acid (AcOH) as the substrate. The complexes are stable in solution while their catalytic turnover frequency is estimated at 10 and 34.6 h−1 molcat−1 for 1 and 2, respectively. Calculations reveal one-electron reduction of 1 is ligand-based, preserving the dicobalt(II) core and activating the ligand
手性羰基二钴(II)配合物[CO II 2(μ 2 -L)2 ](1)(H 2 L = Ñ 2,Ñ 6 -二(喹啉-8-基)吡啶-2,6-二甲酰胺)和其叔丁基类似物[CO II 2(μ 2 -L卜)2 ](2)的合成和结构表征。在1和2的二氯甲烷溶液中添加一当量的AgSbF 6导致分离出混合价的二钴III,II)物种[CO III钴II(μ 2 -L)2 ]的SbF 6(3)和[CO III钴II(μ 2 -L卜)2 ]的SbF 6(4)。在乙酸(AcOH)作为底物的存在下,同价物1和2对质子还原表现出催化活性。该配合物在溶液中稳定,而其催化转换频率估计为10和34.6 h -1 mol cat -1的1和2。计算揭示的单电子还原1是配位体为基础,保留二钴(II)芯和在喹啉基激活朝向质子化的配体。这产生了空的配位位点,其随后被质子化以产生催化普遍存在的氢化Co(III)。双核结构持续存在,
μ-Pyridine-bridged copper complex with robust proton-reducing ability
reduction using aceticacid as external proton source in 95:5 (v/v) DMF/H2O. It shows the ic/ip (where ic is the catalytic current in the presence of aceticacid and ip is the reduction peak current in absence of acid) value of 24 and TOF of 111.70 s-1 at a scan rate of 100 mV s-1 at 25 ℃. The [Cu(DQPD)]2 complex evolves hydrogen under the irradiation of visible light in presence of fluorescein (Fl) as