Sendh Jagajiban, Baruah Jubaraj B
Department of Chemistry, Indian Institute of Technology Guwahati Guwahati-781 039 Assam India
RSC Adv. 2024 Aug 27;14(37):27153-27161. doi: 10.1039/d4ra04655b. eCollection 2024 Aug 22.
The ability of -(1,3-dioxo-1-benzo[de]isoquinolin-2(3)-yl)isonicotinamide (naphydrazide) or 2,6-pyridinedicarboxylic acid (2,6-Hpdc) individually or as a bi-component system in distinguishing and detecting Fe or Fe and Cd ions was investigated. The use of these molecules as single or bi-component analytes in absorption or emission spectroscopy studies showed that under specific conditions each had their own merits for specific purposes. UV-visible spectroscopic studies of 2,6-Hpdc for assessing the interactions with ferrous and ferric ions showed characteristic distinctions. The detection limit for Fe analysed through UV-visible spectroscopy using naphydrazide was 0.46 μM, whereas it was 1.28 μM using 2,6-Hpdc. Naphydrazide together with Fe allowed distinguishing Cd ions from Zn and Fe ions. The bi-component system was useful for the selective detection of Cd ions using fluorescence spectroscopy, with a detection limit for Cd ions of 18.31 μM. The presence of Fe and Cd ions in a solution of the bi-component had resulted white-light emission. An analogous compound ,'-(1,3,6,8-tetraoxobenzo[lmn][3,8]phenanthroline-2,7(1,3,6,8)-diyl)diisonicotinamide (binaphydrazide) was found unsuitable for such detections. Two 2,6-pyridinedicarboxylate Fe complexes possessing protonated naphydrazide or binaphydrazide were prepared and characterised. These complexes were also found unsuitable for the detection of the said ions in solution. Electrochemical studies with the bi-component system showed that cyclic voltammograms could distinguish Fe or Fe from Cd ions.
研究了-(1,3-二氧代-1-苯并[de]异喹啉-2(3)-基)异烟酰胺（萘酰肼）或2,6-吡啶二甲酸（2,6-Hpdc）单独或作为双组分体系区分和检测铁离子或铁离子与镉离子的能力。在吸收或发射光谱研究中，将这些分子用作单组分或双组分分析物表明，在特定条件下，每种分子都有其特定用途的优点。通过紫外可见光谱研究2,6-Hpdc与亚铁离子和铁离子的相互作用显示出特征性差异。使用萘酰肼通过紫外可见光谱分析铁的检测限为0.46μM，而使用2,6-Hpdc时为1.28μM。萘酰肼与铁一起能够区分镉离子与锌离子和铁离子。双组分体系可用于通过荧光光谱法选择性检测镉离子，镉离子的检测限为18.31μM。双组分溶液中存在铁离子和镉离子会产生白光发射。发现一种类似化合物，即'-(1,3,6,8-四氧代苯并[lmn][3,8]菲咯啉-2,7(1,3,6,8)-二基)二异烟酰胺（联萘酰肼）不适用于此类检测。制备并表征了两种具有质子化萘酰肼或联萘酰肼的2,6-吡啶二甲酸铁配合物。还发现这些配合物不适用于检测溶液中的上述离子。对双组分体系的电化学研究表明，循环伏安图可以区分铁离子或亚铁离子与镉离子。
