Experimental Sensing and DFT Mechanism of Zn(II) Complex for Highly Sensitive and Selective Detection of Acetone

Abstract

In the present work, a new Zn(II) perchlorate complex with 2,2’–bipyridyl of formulation {[Zn(bipy)2(H2O)](ClO4)2} (1) was obtained and well analyzed. This chemosensor was evaluated as a selective sensor for acetone among the several different organic solvents(CH3OH, EtOH, i–PrOH, i–BuOH, CHCl3, CH2Cl2, CCl4, C6H6, C7H8, C8H10, C2H3N, C3H7NO, C4H8O2, C3H6O3) in a fluorescence turn–off response in accordance with theoretical calculations. Sensing experiments were performed at ambient temperature which shows the acetone molecule distinctly reduces transfer of energy barrier to complex 1 and hence, produces remarkable luminescent quenching. Also, the weak intermolecular hydrogen–bonding interactions thanks to the presence of various hydrogen bonding donors and acceptors, exist between ligand molecules, which were broken during fluorescence, resulting in quenching. The stoichiometry ratio and association constant were evaluated using Benesi–Hildebrand relation giving 1:1 stoichiometry between complex 1 and acetone. Additionally, DFT results can also explicate the significant response on complex 1 upon addition of acetone. This work is vital in a new loom for the detection of acetone and other ketones.

Multifunctional Zn(II) Coordination Polymer as Highly Selective Fluorescent Sensor and Adsorbent for Dyes

“…The results indicated a decline in the fluorescence emission intensity of 1 on the addition of increasing amounts of acetone. Based on these experiments, the Stern-Volmer plot was constructed (Figure S4a), which exhibited a linear relationship at low concentration values with the Stern-Volmer constant (K sp ) 1.94 × 10 4 M −1 and R 2 = 0.9964, which is better than previously reported fluorescent sensors for acetone [26,28]. The limit of detection for acetone was calculated from the 3σ/slope [41] (σ: standard deviation), that was of the order of 5.5 × 10 −6 mol L −1 (R 2 = 0.9886) (ESI, Figure S4b), and is lower than previously reported fluorescence sensors for acetone [20,26,28].…”

“…In view of these noteworthy facts associated with the Zn(II)-Schiff base complexes and the associated benefits of the d 10 -configuration [28] based Zn(II) complex, these complexes can act as sensors for a varied type of analytes viz. acetone and analogous solvents/nitro explosives/different metals.…”

A fluorescent Cu(ii) complex as a dual functional sensor for selective and sensitive detection of acetone and Cd(ii) pollutants

“…The absorbed chemical is distributed throughout the body, particularly affecting organs with high water content, which leads to metabolic disorders and severe damage to various systems. [2][3][4] Furthermore, Cd 2+ is a toxic heavy metal associated with different adverse effects as well as occupational and environmental concerns. 5 Healthy levels of Cd 2+ in the blood are <5.0 ng mL À1 , with most results in the range of 0.5-2.0 ng mL À1 .…”