A highly sensitive and selective thiosemicarbazone chemosensor for detection of Co2+ in aqueous environments using RSM and TD/DFT approaches

Abstract

Chemosensor using organic based compound offering superior alternative method in recognizing metal ion in environmental water. The optimization process strongly affected the performance of the designed sensor. In this study, a highly sensitive and selective colorimetric sensor system utilizing an organic compound, namely thiosemicarbazone-linked acetylpyrazine (TLA), to recognize Co2+ ions in different environmental water samples was successfully developed using the response surface methodology (RSM) approach. The developed model was optimized successfully and had statistically significant independent variables (p < 0.05), with optimum recognition occurring in 8:2 v/v DMSO/water at a pH of 5.3, a 100:70 µM TLA/Co2+ concentration, and 15 min of reaction time. Under optimum conditions, the TLA sensor recognized Co2+ ions at concentrations as low as 1.637 µM, which is lower than the detection limit of flame atomic absorption spectroscopy (FAAS). Theoretical approaches supported the experimental data as well as characterized and predicted the mechanistic non-covalent interactions of TLA-Co2+ within the chemosensing system. Finally, all the positive results produced in this study point to TLA as an alternative and comparable probe for recognizing Co2+ pollution in water that is cost effective, movable and easy-to-handle, requires no special training and ecofriendly.

Colorimetric and naked-eye detection of arsenic(iii) using a paper-based microfluidic device decorated with silver nanoparticles

“…Selectivity is one of the most significant factors for the analytical evaluation of chemosensors. 81 Specificity indicates the ability of a sensing probe to detect an analyte in a specimen containing other contaminants. 82 Therefore, to evaluate the selectivity of the proposed probes for the recognition of As( iii ), their colorimetric and spectrophotometric behavior was done.…”

Insight into the photodegradation mechanism of bisphenol-A by oxygen doped mesoporous carbon nitride under visible light irradiation and DFT calculations

“…However, the results of these approaches need to align with the hard and soft acid and base (HSAB) concept, where the hard and soft base atoms prefer to coordinate with the hard and soft acid atoms, respectively. 69 …”

Influence of the Reaction Conditions in the Crystal Structures of Zn(II) and Ni(II) Coordination Compounds with a Dissymmetric Bis(Thiosemicarbazone) Ligand

“…This, together with the control of protonation/deprotonation and the nature of auxiliary anions, lead to the formation of different structures such as monomers [10][11][12], dimers [13][14][15] or coordination polymers [16][17][18]. In addition to their fascinating structural properties, TSCs have a wide range of applications in different fields as catalysis [19][20][21], metal detoxification [22][23][24], metal sensing [25][26][27] or medicine [28][29][30][31].…”