Complex formation of Sn(II) with l-cysteine: An IR, DTA/TGA and DFT Investigation

Novikova, Galina V.; Петров, А. И.; Staloverova, Natalya A.; Шубин, А. А.; Dergachev, Ilya D.

doi:10.1016/j.saa.2013.11.048

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…Two absorption peaks at 2552 and 942 cm –1 , which are attributed to characteristic peaks of the R-SH group in l -cysteine, disappear in the mixed solution of SnCl 2 and l -cysteine. It clearly indicates that l -cysteine is coordinated to tin (II) cation through sulfur atom. ,, Another two peaks at 2082 and 1532 cm –1 of the R-NH 2 group are also absent in the chelate complex, representing the coordination between Sn 2+ and nitrogen atom. , Furthermore, there is no significant change about the characteristic peaks of the R-COOH group, with a slight shifting of one peak from 1588 to 1658 cm –1 , which suggests unfavorable formation of an Sn–O bond. , According to the FT-IR results, the typical molecular structure of the chelate complex is illustrated as shown in Figure b, which is characterized by the bonding among Sn 2+ , sulfur, and nitrogen atoms. Worth noting is that the electrospun fibers after preoxidation show the similar FT-IR characteristic peaks as those in the chelate complex, demonstrating the stability of bonding states (Figure S1).…”

Section: Resultsmentioning

confidence: 92%

“…PVP/metal salt/ l -cysteine and PAN are chosen as the precursors of the core and shell layer, separately. l -Cysteine possesses three different ligands, namely, a thiol group (R-SH), carboxyl group (R-COOH), and amino group (R-NH 2 ), which are expected to bond with metal ions to form a chelate complex. − The key to prepare metal sulfides using the electrospinning technique is the formation of bonds between metal cations and R-SH of l -cysteine. FT-IR spectroscopy was conducted to determine the bonding states between SnCl 2 and l -cysteine, as shown in Figure c.…”

Section: Resultsmentioning

confidence: 99%

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A Universal Strategy to Fabricate Metal Sulfides@Carbon Fibers As Freestanding and Flexible Anodes for High-Performance Lithium/Sodium Storage

Zhu

et al. 2019

ACS Appl. Energy Mater.

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The future trend toward flexible electronics creates a demand for flexible power sources using rechargeable batteries, where freestanding and flexible electrodes are of critical importance. The utilization of high capacity anode materials like metal sulfides in flexible batteries is highly desirable for the miniaturization of electronic devices but is nevertheless very challenging in the fabrication of an electrode that is freestanding and flexible. Herein, a universal electrospinning strategy to fabricate freestanding and flexible metal sulfides@carbon electrodes is proposed based on the formation of chelate complexes between l-cysteine and metal cations. Taking SnS as a model material, flexible fiber electrodes are realized with SnS nanoparticles well embedded in the continuous and interwoven carbon fibers. As freestanding electrodes for lithium and sodium storage, a high capacity, good rate capability, and excellent cycling stability are simultaneously achieved. Such a strategy is also successfully extended to the fabrication of Ni3S2/C fibers and Fe7S8/C fibers, suggesting the universality in fabricating freestanding and flexible high capacity electrodes.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

A Universal Strategy to Fabricate Metal Sulfides@Carbon Fibers As Freestanding and Flexible Anodes for High-Performance Lithium/Sodium Storage

Zhu

et al. 2019

ACS Appl. Energy Mater.

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“…In fact, a carboxylate group binding to the metal ion frequently forms the O=C—O – structure with a strong C=O stretching peak at the region of ∼1640–1740 cm –1 . 29,30 In the spectrum of CdSe-Cys, however, no such peak was observed. Thus, we tentatively postulate that the carboxylate group of ligand–cysteine has the (O–C–O) − structure, where an electron is delocalized equally over the two oxygen atoms.…”

Section: Resultsmentioning

confidence: 95%

Capping Structure of Ligand–Cysteine on CdSe Magic-Sized Clusters

2019

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Ligand molecules capping on clusters largely affect the formation and stabilization mechanism and the property of clusters. In semiconductor CdSe clusters, cysteine is used as one of the ligands and allows the formation of ultrastable (CdSe) 34 magic-sized clusters. Cysteine has sulfhydryl, amine, and carboxylate groups, all of which have coordination ability to the CdSe surface, and the bonding states of the three functional groups of ligand–cysteine on the CdSe core have not been determined. In this work, the capping structure of ligand–cysteine is examined by performing Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and multinuclear solid-state nuclear magnetic resonance (NMR) spectroscopy. FT-IR, XPS, and 1 H, 13 C, and 23 Na magic-angle spinning NMR show that the sulfhydryl group of ligand–cysteine forms a sulfur–cadmium bond with a cadmium atom at the CdSe surface, while the carboxylate group does not contribute to the protection of the CdSe core and binds to a sodium ion contained as a counterion. 15 N–{ 77 Se} through-bond J -single quantum filtered NMR experiment reveals that the amine group of ligand–cysteine has no coordination to selenium atoms. By considering the N–Cd bond forming ratio (∼43%) revealed in our previous work, which is confirmed in this work by analyzing 13 C α signal intensity (∼42%), we concluded that cysteine capping on (CdSe) 34 occurs in two ways: one involves both the sulfur–cadmium and nitrogen–cadmium bonds, and the other bears only the sulfur–cadmium bond.

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“…The weight loss percentage analysis (TG graphs) shows four similar degradation steps for both compounds with weight loss of 9.4, 18.1, 17.2, and 26.2% for ZGluGO ( Figure 3 a, DTG graph: 92.6, 191.2, 364.8, and 502.6–563.6 °C, respectively) and 8.3, 15.5, 18.7, and 26.5% for ZAspGO ( Figure 3 b, DTG graph: 103.9, 185.1, 320.3, and 431.4–542.5 °C). The first degradation step presents the lowest percentage of weight loss (9.4 and 8.3%), which can be attributed to the evaporation of water on the surface of the material [ 44 ]. The second degradation step represents the loss of water of crystallization and the initial decomposition of organic components.…”

Section: Resultsmentioning

confidence: 99%

Amino Acid Complexes of Zirconium in a Carbon Composite for the Efficient Removal of Fluoride Ions from Water

González-Aguiñaga

Pérez-Tavares

Patakfalvi

et al. 2022

IJERPH

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Amino acid complexes of zirconia represent an entirely new class of materials that were synthesized and studied for the first time for the decontamination of fluoride ion containing aqueous solutions. Glutamic and aspartic acid complexes of zirconia assembled with thin carbon (stacked graphene oxide) platelets deriving from graphite oxide (GO) were synthesized by a two-step method to prepare adsorbents. The characterization of the complexes was carried out using infrared spectroscopy to determine the functional groups and the types of interaction between the composites and fluoride ions. To reveal the mechanisms and extent of adsorption, two types of batch adsorption measurements were performed: (i) varying equilibrium fluoride ion concentrations to construct adsorption isotherms at pH = 7 in the absence of added electrolytes and (ii) using fixed initial fluoride ion concentrations (10 mg/L) with a variation of either the pH or the concentration of a series of salts that potentially interfere with adsorption. The experimental adsorption isotherms were fitted by three different theoretical isotherm equations, and they are described most appropriately by the two-site Langmuir model for both adsorbents. The adsorption capacities of Zr-glutamic acid-graphite oxide and Zr-aspartic acid-graphite oxide are 105.3 and 101.0 mg/g, respectively. We found that two distinct binding modes are combined in the Zr-amino acid complexes: at low solution concentrations, F− ions are preferentially adsorbed by coordinating to the surface Zr species up to a capacity of ca. 10 mg/g. At higher concentrations, however, large amounts of fluoride ions may undergo anion exchange processes and physisorption may occur on the positively charged ammonium moieties of the interfacially bound amino acid molecules. The high adsorption capacity and affinity of the studied dicarboxylate-type amino acids demonstrate that amino acid complexes of zirconia are highly variable materials for the safe and efficient capture of strong Lewis base-type ions such as fluoride.

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Complex formation of Sn(II) with l-cysteine: An IR, DTA/TGA and DFT Investigation

Cited by 12 publications

References 20 publications

A Universal Strategy to Fabricate Metal Sulfides@Carbon Fibers As Freestanding and Flexible Anodes for High-Performance Lithium/Sodium Storage

A Universal Strategy to Fabricate Metal Sulfides@Carbon Fibers As Freestanding and Flexible Anodes for High-Performance Lithium/Sodium Storage

Capping Structure of Ligand–Cysteine on CdSe Magic-Sized Clusters

Amino Acid Complexes of Zirconium in a Carbon Composite for the Efficient Removal of Fluoride Ions from Water

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