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Interaction of pyridoxal-derived hydrazones with anions and Co2+, Co3+, Ni2+, Zn2+ cations
Physics and Chemistry of Liquids ( IF 1.2 ) Pub Date : 2020-06-05 , DOI: 10.1080/00319104.2020.1774878
G.A. Gamov 1 , M.N. Zavalishin 1 , M.V. Petrova 1 , A.Yu. Khokhlova 1 , A.V. Gashnikova 1 , A.N. Kiselev 2 , V.A. Sharnin 1
Affiliation  

ABSTRACT

Present paper reports on the interactions between four hydrazones derived from pyridoxal and hydrazides of 2-furoic, thiophene-2-carboxylic, pyrazinoic and pyridine-3-carboxylic acids and 10 different anions (F, Cl, I, PO43-, HPO42-, H2PO43-, NO3, SO32-, SO42-, CH3COO) and three cations (Co2+, Ni2+, Zn2+). Hydrazones are sensitive towards anion presence in non-buffered DMSO only, thus, indicating that the proton transfer from ligand towards anion is responsible for the changes in colour, UV-Vis and fluorescent spectra. Buffered solutions of ligand mixture with any anion are indistinguishable from free hydrazone. The addition of d-metal ions to pyridoxal-derived hydrazones dissolved in buffered DMSO changes the solution colour, UV-Vis and fluorescent spectra. Conditional rate constants of Co2+ oxidation, as well as the apparent stability constants of Co2+, Co3+ complexes with Schiff bases, were determined from kinetic experiments, while Ni2+, Zn2+ complexes stability constants were calculated from UV-Vis and fluorimetry titration data.



中文翻译:

吡哆醛衍生腙与阴离子和 Co2+、Co3+、Ni2+、Zn2+ 阳离子的相互作用

摘要

本论文报告了衍生自吡哆醛的四种腙与 2-呋喃、噻吩-2-羧酸、吡嗪酸和吡啶-3-羧酸的酰肼与 10 种不同阴离子(F -、Cl -、I -、PO 4 3)之间的相互作用- , HPO 4 2- , H 2 PO 4 3- , NO 3 - , SO 3 2- , SO 4 2- , CH 3 COO - )和三种阳离子(Co 2+ , Ni 2+ , Zn 2+)。腙仅对非缓冲 DMSO 中存在的阴离子敏感,因此,表明从配体向阴离子的质子转移是颜色、UV-Vis 和荧光光谱变化的原因。带有任何阴离子的配体混合物的缓冲溶液与游离腙无法区分。将 d-金属离子添加到溶解在缓冲 DMSO 中的吡哆醛衍生腙中会改变溶液颜色、UV-Vis 和荧光光谱。Co 2+氧化的条件速率常数以及Co 2+、Co 3+与席夫碱配合物的表观稳定常数由动力学实验确定,而Ni 2+、Zn 2+ 配合物稳定性常数由紫外-可见光和荧光滴定数据计算。

更新日期:2020-06-05
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