SOD activity of new copper II complexes with ligands derived from pyridoxal and toxicity in Caenorhabditis elegans
作者:Josiéli Demétrio Siqueira、Sidnei Flores de Pellegrin、Sailer Santos dos Santos、Bernardo Almeida Iglesias、Paulo Cesar Piquini、Leticia Priscilla Arantes、Félix Antunes Soares、Otávio Augusto Chaves、Ademir Neves、Davi Fernando Back
DOI:10.1016/j.jinorgbio.2019.110950
日期:2020.3
This work presents the synthesis, characterization of copper(II) complexes (C1-C6) and the potential of these compounds to mimic the catalytic activity of the enzyme superoxide dismutase (SOD). The copper(II)complexes were obtained by reaction between the aldol condensation between substituted aromatic hydrazides and aromatic aldehydes (salicylic aldehyde and pyridoxal hydrochloride), forming two new
state change on the bond distances and angles, pointing to solvation as the cause of the structural distortion. All complexes were tested as (pre) catalysts for olefin epoxidation by aqueous tert-butylhydroxyperoxide (TBHP) under solvent-free conditions. Low vanadium loadings (0.05% vs. olefin) resulted in good cyclooctene conversions and TOFs. The lifetime of one catalyst was explored through repeated
报道了一系列双核和单核氧钒(V)络合物,其中包含衍生自吡ido醛的三齿席夫碱配体和合适的硫代氨基脲或酰肼。通过元素分析,热重分析,IR和NMR光谱对化合物进行表征。 X射线晶体学测定的双氧钒(V)络合物[VO 2(HL 5)]·MeOH·H 2 O(H 2 L 5 =吡ido醛苯并肼基配体)的分子结构揭示了出乎意料的扭曲三角锥体VO 2部分的排列。DFT研究此分子和V的相关[VO 2(H 2 L 5)]络合物IV揭示了氧化态变化对键距和角度的适度影响,指出溶剂化是结构变形的原因。在无溶剂条件下,将所有配合物作为叔丁基羟基过氧化物水溶液(TBHP)进行烯烃环氧化的(预)催化剂进行测试。低钒含量(相对于烯烃为0.05%)导致良好的环辛烯转化率和TOF。通过重复运行与回收/循环来探索一种催化剂的寿命。DFT计算还解决了烯烃的环氧化机理,该机理揭示了活化的叔丁氧基(t BuOO –)配体可能直接转移了O原子,而无需产生过氧化物(O2
crystal and molecular structure of the pyridoxal benzhydrazone H2L2, three mononuclear complexes [MoO2(L1–3)(MeOH)], and the Lindqvist-containing compounds [MoO2(HL2)]2Mo6O19·2MeCN and (H4L1)Mo6O19 were determined by single crystal X-ray diffraction. All complexes were tested as (pre)catalysts for the epoxidation of cyclooctene under solvent-free conditions with the use of aqueous TBHP (TBHP = tert
吡哆醛hydrazonato钼(VI由相应的腙的反应制备)配合物(ħ 2大号1 =吡哆醛异烟酸腙,ħ 2大号2 =吡哆醛benzhydrazone,ħ 2大号3 =吡哆醛4-羟基benzhydrazone)和[的MoO 2(acac)2 ]在适当的条件下。络合物可分为三类:单核[MoO 2(L 1-3)(MeOH)],多核[MoO 2(L 1-3)] n以及与Lindqvist聚氧钼酸盐[MoO 2(HL 1-3)] 2 Mo 6 O 19的杂化有机-无机化合物。本文首次报道了具有Lindqvist阴离子的阳离子聚合物组件的独特实例。通过元素,TG和DSC分析以及光谱技术(IR,UV-Vis,1 H,13 C NMR)对化合物进行表征。吡ido醛苯并zone H 2 L 2,三种单核络合物[MoO 2(L 1-3)(MeOH)]和含Lindqvist的化合物[MoO 2(HL 2))]通过单晶X射线衍射测定2