Synthesis and metal ion binding properties of thiaaza crown macrocycles

Alp, Hakan; Gök, Yaşar; Kanteki̇n, Hali̇t; Ocak, Ümmühan

doi:10.1016/j.jhazmat.2008.02.093

Cited by 17 publications

(11 citation statements)

References 12 publications

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“…Picrate extraction experiments were performed according to published procedures (23)(24)(25)(26). Solvent extraction experiments were carried out using the aqueous metal picrate solutions, which were prepared from a mixture of the metal nitrates (Pb(NO 3 and picric acid in deionized water.…”

Section: Extraction Methodsmentioning

confidence: 99%

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Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

Gök

Demir

2015

Separation Science and Technology

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The metal ion-binding properties of two 27-membered macrocycles with N 2 S 5 O 2 donor atoms 1 and 2 were investigated using solvent extraction experiments. In order to explain complexation behavior of macrocycles, extraction of ions in the interfacial region of liquid-liquid phase was modeled by Langmuir adsorption isotherm. The macrocycles 1 and 2 extracted Ag + metal ion up to 95% to the dichloromethane and chloroform phase effectively. The Ag + ion adsorption capacities of macrocycles 1 and 2 were obtained as 75% and 98% at 20°C, respectively.

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Section: Extraction Methodsmentioning

confidence: 99%

“…(4) in Eq. (3) and taking the log of both sides give the following logarithmic expression, which is valid for the above extraction system (23)(24)(25)(26). …”

Section: Extraction Methodsmentioning

confidence: 99%

Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

Gök

Demir

2015

Separation Science and Technology

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“…They are capable of capturing cations into their cavities. 1,2 Therefore, crown ethers are an attractive tool to model various biological systems due to their ability to selectively form complexes with metal cations depending on the ring size of cyclic polyether and diameter of the cation. 3 In combination with chromophores, an application of crown ethers as optical sensors is also possible.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of alkali metal complex formation of polymer-bonded crown ether

Bey

Dreyer

Abetz

2017

Phys. Chem. Chem. Phys.

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The complex formation of two crown ethers with colored alkali metal salts was investigated by UV/Vis spectroscopy. Complexation was accomplished with free benzo-15-crown-5 (B15C5) and 15-crown-5 bonded to a diblock copolymer (Poly15C5). The diblock copolymer was synthesized by two controlled polymerization techniques and copper(I)-catalyzed azide-alkyne cycloaddition. Depending on the inserted cation, 1 : 1-or 1 : 2-complexes are formed. A significant difference of the stability constants was determined by concentration dependence solvent extraction with sodium or potassium salt. For Poly15C5 the stability constants increase for both salts compared to the stability constants of B15C5, which suggests a more effective complexation. Evaluation of the thermodynamics (DH, DS, DG) of cation complexation was achieved by temperature dependence phase extraction on the basis of established thermodynamic equations. Remarkably, in all cases the entropic gain seems to be the major propulsion facilitating the complexation between alkali metal salts and crown ethers. Indeed, by using Poly15C5 a more pronounced dependency of enthalpy and entropy on the complex formation is calculated.

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“…In this regard oxo-thiocrown ethers are prepared and used as potential heavy-metal receptors. In this work, oxo-thiocrown ethers having different ring size or arrangement have been prepared and their complexation properties have been investigated with various metal cations by conductometry [4,5,6,7]. …”

Section: Introductionmentioning

confidence: 99%

Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

Çiçek

Yıldız

2011

Molecules

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The synthesis of some thio-oxocrown ether ligands, B1 (1,4-dithio-12-crown-4), B2 (1,7-dithio-12-crown-4), B3 (1,7-dithio-15-Crown-5), B4 (1,7-dithio-18-crown-6), B5 (1,10-dithio-18-crown-6), B6 (1,10-dithio-21-crown-7), under mild conditions, were reported. The ligands were characterized by FT-IR, 1H NMR and GC-MS spectroscopy. The formation of 1:1 ligand complexes with a variety of metal salts (Ag+, Ca+2, K+, Na+, Mg+2, Zn+2 and Fe+2) were investigated by a conductometric method in a 1:1 dioxane–water system at 25 °C, and the complexation constants (Ke = (ΛMAm -Λ) / ((Λ-ΛMaLbAm) [L]) and free energy (∆Go= - RT lnKe) values are calculated. Details of the specific molecular interactions between the ligands and metals were proposed. We also performed DFT calculations to explain their geometrical properties, charges and frontier molecular orbitals.

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Synthesis and metal ion binding properties of thiaaza crown macrocycles

Cited by 17 publications

References 12 publications

Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

Thermodynamic analysis of alkali metal complex formation of polymer-bonded crown ether

Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

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