Article
Chemistry, Physical
Mohammad Kazem Rofouei, Jahan B. Ghasemi, Leila Arjomandi-Behzad, Hassan Behnejad
Summary: The complexation reactions of Hg2+, Pb2+, Zn2+, and Cd2+ cations with newly synthesized triazene ligands were studied in nonaqueous solvents. The results showed that the properties of the solvents and the shape of solvent molecules played important roles in the complex stability. Furthermore, a linear relationship between the formation constants and temperature was observed, and entropy-enthalpy compensation was found in the complexation reactions.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Jasim M. S. Alshawi, Mohammed Q. Mohammed, Hasan F. Alesary, Hani K. Ismail, Stephen Barton
Summary: A novel electrochemical sensor based on a platinum electrode modified by poly(3,4-ethylenedioxythiophene) and N alpha,N alpha-bis-(carboxymethyl)-L-lysine hydrate (NTA lysine) was developed for determining trace levels of Hg2+, Pb2+, and Zn2+ ions in water using square wave voltammetry. The modified electrode was characterized and the electrochemical properties were investigated. The sensor showed linear responses and low detection limits for Hg2+, Pb2+, and Zn2+ ions.
Article
Chemistry, Organic
Jia-De Lian, Hsin-Yu Hu, Yi-Han Lin, Putikam Raghunath, Ming-Chang Lin, Wen-Sheng Chung
Summary: A series of calix[4]arenes with upper-rim sulfanylpropyl and p-methoxyphenylazo groups were synthesized and found to be effective chromogenic sensors for selectively detecting Hg2+, Hg+, and Ag+ ions among 18 screened metal perchlorates. The distal orientation of sulfanylpropyl and p-methoxyphenylazo groups in the calix[4]arenes was found to be more favorable for binding Hg2+ ions than the proximal orientation. The adjacent sulfanylpropyl groups exhibited superior coordination as ligands compared to the allyl and thioacetoxypropyl groups.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
M. Wozny, D. Trzybinski, K. Dabrowa, J. Narodowiec, K. Woz Niak
Summary: This paper describes a method for preparing SDB24C8 and investigates its properties and interactions with metal ions. The results show that the introduction of a sulfonic group can enhance the receptor's affinity and an unusual selectivity of SDB24C8 towards a sodium cation was observed.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Prabhpreet Singh, Navdeep Kaur, Rajdeep Kaur
Summary: This article describes the synthesis of a pseudo-crown ether that selectively binds with Pb2+ ions in solution, leading to significant changes in various properties and potential applications in the biological field. The complexation was characterized and demonstrated using multiple techniques, showing a potential 'turn-on' sensing approach for amines through displacement method.
Article
Environmental Sciences
A. K. Priya, V Yogeshwaran, Saravanan Rajendran, Tuan K. A. Hoang, Matias Soto-Moscoso, Ayman A. Ghfar, Chinna Bathula
Summary: This study investigated the potential use of rice husk powder as a biosorbent for the removal of heavy metal ions from aqueous solutions. The experimental results showed that under optimized conditions, rice husk powder could effectively remove Cr, Pb, and Zn metal ions with high efficiency. The adsorption process followed the Temkin and D-R isotherm model and Elovich model for kinetic data. Based on the findings, rice husk powder could be considered as a low-cost and efficient adsorbent for heavy metal ion removal from industrial effluent.
Article
Chemistry, Applied
Levon S. Atabekyan, Alexandra Ya Freidzon, Alexander K. Chibisov, Sergey P. Gromov, Sergey Z. Vatsadze, Vyacheslav N. Nuriev, Alexey Medvedko
Summary: This study focused on the photoprocesses of bis(18-crown-6)-1,3-distyrylbenzene (DSB) and its complexes with barium and lead perchlorates in a MeCN-CH2Cl2 mixture. Triplet DSB complexes were found to play a role in radiationless deactivation and fluorescence processes, with the most effective intersystem crossing observed in the lead perchlorate complex. Quantum chemistry was used to calculate geometric structures and absorption spectra, providing explanations for the observed results.
Article
Chemistry, Physical
Marija Cvetnic, Robert Splajt, Edi Topic, Mirta Rubcic, Nikola Bregovic
Summary: This paper reports on the first direct thermodynamic study of chemical reactions between solid reactants using isothermal calorimetry. Three different types of reactions were investigated, and the results were compared with those obtained via solution calorimetry to confirm the reliability of the method. This work is important for gaining a deeper understanding of the factors governing solid-state processes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Katarina Leko, Andrea Usenik, Nikola Cindro, Matija Modrusan, Josip Pozar, Gordan Horvat, Vladimir Stilinovic, Tomica Hrenar, Vladislav Tomisic
Summary: Novel fluorescent calix[4]arene derivatives L1 and L2 were synthesized and their complexation properties with alkali metal cations were investigated. Thermodynamic parameters were determined to show that L1 has higher affinity toward cations and the stability of the complexes is solvent-dependent.
Article
Biochemistry & Molecular Biology
Xinning Liu, Menghan Wu, Chenchen Li, Peng Yu, Shanshan Feng, Yanwei Li, Qingzhu Zhang
Summary: This study systematically investigated the adsorption potential of heavy metals with amino acids using Density Functional Theory method. It revealed the contribution order of amino acid side chains to the binding affinity and the affinity order of heavy metal cations. The significant influence of water environment on the structures and binding energies of the complexes was also confirmed.
Article
Chemistry, Physical
Jiajia Han, Longsheng Pei, Jianpo Su, Yongmei Zhu
Summary: In this study, COFDDTA-TPA was synthesized using TPA and DDTA, and it was found to have abundant sites and large surface area, making it an excellent adsorbent for heavy metal ions. By growing COFDDTA-TPA on a supporting material, effective removal of heavy metal ions was achieved, and the material was successfully applied in real samples.
Article
Chemistry, Physical
Irina A. Kuz'mina, Mariia A. (Kovanova) Volkova, Ekaterina G. Odintsova, Valentin A. Sharnin
Summary: This study used molecular dynamics modeling to investigate the structure of the molecular system 18-crown-6 ether - methanol-acetonitrile, and found that the macrocycle molecule forms hydrogen bonds with methanol and solvation of 18C6 by molecules of AN occurs due to electron donor-acceptor interactions. Additionally, EDA interactions were observed between methanol and acetonitrile molecules.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Alexandru Bujor, Iulia Matei, Daniela C. Culita, Anamaria Hanganu, Victorita Tecuceanu, Petre Ionita
Summary: NBD-chloride was used as a label to synthesize three new derivatives, which were compared with corresponding derivatives obtained using different methods. The compounds were characterized using UV-Vis, IR, NMR, fluorescence, and MS spectra.
REVUE ROUMAINE DE CHIMIE
(2022)
Article
Engineering, Chemical
Fang Wang, Zhuang Liu, Rui Xie, Xiao-Jie Ju, Wei Wang, Da-Wei Pan, Liang-Yin Chu
Summary: Lead(II) (Pb2+) ions are toxic heavy metal ions that can be accumulated in the human body through water and cause various health problems. We have developed a novel Pb2+-recognizable microgel with excellent adsorption capacity for selective and effective removal of Pb2+ from aqueous solutions. The microgel, fabricated from 4-acrylamidobenzo-18-crown-6 (B18C6Am) and N-isopropylmethacrylamide (NIPMAM) monomers, exhibits expanded structures which enhance the adsorption of Pb2+ due to low steric hindrance. The results suggest that the microgel is highly promising for the selective removal of lead(II) ions.
Article
Chemistry, Physical
Hesam Arabzadeh, Brandon Walker, Joseph M. Sperling, Orlando Acevedo, Pengyu Ren, Wei Yang, Thomas E. Albrecht-Schonzart
Summary: To efficiently separate lanthanide elements, researchers have used molecular dynamics simulations to study the coordination of DCH18C6 with several lanthanide and actinide elements. It was found that Dy2+ and Yb2+, which have comparatively smaller ionic radii, may not be an ideal fit with DCH18C6's ring size. Additionally, the binding free energies of different DCH18C6 diastereoisomers with lanthanide elements showed variations.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
