7440-57-5Relevant academic research and scientific papers
Consecutive Nucleation and Confinement Modulation towards Li Plating in Seeded Capsules for Durable Li-Metal Batteries
Huang, Minsong,Yao, Zhenguo,Yang, Qifan,Li, Chilin
supporting information, p. 14040 - 14050 (2021/05/13)
A dual modulation strategy of consecutive nucleation and confined growth of Li metal is proposed by using the metal–organic framework (MOF) derivative hollow capsule with inbuilt lithiophilic Au or Co-O nanoparticle (NP) seeds as heterogeneous host. The seeding-induced nucleation enables the negligible overpotential and promotes the inward injection of Li mass into the abundant cavities in host, followed by the conformal plating of Li on the outer surface of host during discharging. This modulation alleviates the dendrite growth and volume expansion of Li plating. The interconnected porous host network enables enhancement of cycling and rate performances of Li metal (a lifespan over 1200 h for Au-seeding symmetric cells, and an endurance of 220 cycles under an ultrahigh current density of 10 mA cm?2 for corresponding asymmetric cells). The hollow capsules integrated with lithiophilic seeds solve the deformation problem of Li metal for durable and long-life Li-metal batteries.
DOUBLE GOLD(III)–ZINC(II) DI-ISO-BUTYLDITHIOCARBAMATO- CHLORIDO COMPLEXES OF THE COMPOSITION [Au(S2CNR2)2]2[Zn2Cl6] AND [Au(S2CNR2)2][Zn(S2CNR2)Cl2]: SYNTHESIS, STRUCTURAL ORGANIZATION, 13C CP-MAS NMR, AND THERMAL BEHAVIOR
Rodina,Loseva,Ivanov
, p. 123 - 136 (2021/02/26)
Abstract: The interaction of zinc(II) di-iso-butyldithiocarbamate with [AuCl4]— anions in 2M HCl is studied. The result of chemisorption binding of gold(III) from a solution to the solid phase is the formation of double ionic complexes of the compositions [Au{S2CN(iso-C4H9)2}2]2[Zn2Cl6] (1) and [Au{S2CN(iso-C4H9)2}2][Zn{S2CN(iso-C4H9)2}Cl2] (2). The chemical identification of preparatively isolated crystalline compounds was performed by 13C CP-MAS NMR spectroscopy. According to single crystal X-ray diffraction data, structural units of complex 1 are a binuclear zinc anion and non-equivalent complex [Au{S2CN(iso-C4H9)2}2]+ cations: centrosymmetric A with the Au(1) atom and С – Au(3) and non-centrosymmetric В – Au(2). With the participation of secondary Cl?S bonds (3.2407?? and 3.2756??), В cations and anions form supramolecular ionic pairs. The structure of 2 in turn involves the centrosymmetric gold(III) cation whose counterion is a mixed-ligand dithiocarbamato-chlorido anion of zinc(II). Pairs of non-equivalent secondary Cl?S bonds (3.2337?? and 3.3151??) combine the ionic structural units of 2 into zigzag-like pseudo-polymeric chains along which the alternation of complex cations and anions is noted. Thermolysis of complexes in cationic and anionic parts is accompanied by the quantitative regeneration of bound gold along with the formation of ZnCl2 and ZnS.
Silver(I) and gold(I) complexes with sulfasalazine: Spectroscopic characterization, theoretical studies and antiproliferative activities over Gram-positive and Gram-negative bacterial strains
Corbi, Pedro P.,Fiori-Duarte, Ana Thereza,Lustri, Wilton R.,Manzano, Carlos M.,de Paiva, Raphael Enoque F.
, (2020/04/17)
The emergence of bacterial strains resistant to antibiotics, such as the sulfonamides (sulfa drugs), is currently a case of concern. The synthesis of metal complexes using well-known antibacterial agents and bioactive metals has proven to be an excellent strategy in the development of new and more active metallodrugs. Herein, we report the synthesis, structural characterization and antibacterial analysis of new gold(I) and silver(I) complexes with the sulfa drug sulfasalazine (ssz). Elemental, thermal and high-resolution mass spectrometric measurements indicated a 1:1:1 Au/ssz/Ph3P molar composition for the gold(I) complex (Ph3P - triphenylphosphine), while for the silver(I) complex the molar composition was 1:1 Ag/ssz. Solution state NMR and infrared spectroscopic data suggest that ssz coordinates to silver(I) and gold(I) by the oxygen atoms of the deprotonated carboxylic group. The coordination mode of the carboxylate was supported by density functional theory (DFT) calculations, which reinforces a monodentate coordination for the gold(I) complex and a bridged bidentate mode for the silver(I) one, with the molecular formulas [(Ph3P)Au(ssz)] and [Ag(ssz)]2, respectively. Antibacterial activity assays indicated the sensitivity of Gram-positive (Staphylococcus aureus and Bacillus cereus) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains to [Ag(ssz)]2 and [(Ph3P)Au(ssz)] complexes, while the free ligand was not able to inhibit the growth of any tested bacteria. The non-interaction of the complexes with deoxyribonucleic acid (DNA) was also demonstrated, which suggests that this biomolecule is not a preferential target for the compounds.
Pharmacological properties of dicyanidoaurate(I)-based complexes: characterization and single crystal X-ray analysis
Karada?, Ahmet,Aydin, Ali,Tekin, ?aban,Akba?, Hüseyin,Dede, Süreyya
, p. 860 - 878 (2019/03/11)
Absract: The synthesis of three bimetallic cyanido complexes with edbea [2,2′-(ethylenedioxy)bis(ethylamine)] ligand is reported. [NiII(μ-edbea)2{Au(μ-CN)2}2]n (1), [{CuII(edbea)}2{Au(μ-CN)2}4]n (2) and [CdII(edbea)2][Au(CN)2]2·H2O (3) were fully characterized by elemental, infrared, XRD (3), ESI-MS and thermal analysis. The DNA/BSA binding properties of these complexes were evaluated by spectrophotometric titration, fluorometric ethidium bromide kinetics, and DNA electrophoresis studies and their partially minor groove binding mode between the base pairs of DNA and electrostatic interaction between the amino acid residues of BSA were explained. The complexes were tested for their pharmacological properties. These molecules had excellent in vitro antiproliferative activity and also exhibited a strong tumor inhibiting effect against HT29, HeLa, C6 and Vero cell lines. These complexes had metastatic features as they are able to reduce cell migration activity and suppress tumor growth in vitro. Analysis of the DNA topoisomerase I relaxing activity indicates that the complexes do not inhibit topoisomerase I which regulates the topological states of the DNA double helix during DNA processing reactions. The TUNEL and DNA laddering assay results indicated that these compounds may destroy cell maintenance by triggering apoptosis. Immunohistochemistry staining analysis demonstrated that these complexes significantly decreased the expression of Bcl-2 in HeLa and HT29 cells while increasing the expression of P53 levels. Overall, the potent antiproliferative activity, low cytotoxic effect, good solubility, and micro molar range dosage observed for these complexes emphasizes their potential as anticancer drug candidates.
Binding of Gold(III) from Solutions with Thallium(I) Dibutyldithiocarbamate: Synthesis, Supramolecular Self-Organization, and Thermal Behavior of the Complex ([Au{S2CN(C4H9)2}2][TlCl4])n
Ivanov,Bredyuk,Loseva
, p. 1470 - 1477 (2018/09/11)
The binding of gold(III) from solution in a 2 M HCl with thallium(I) dibutyl dithiocarbamate leads to the formation of ion-polymeric complex ([Au{S2CN(C4H9)2}2][TlCl4])n, which was studied by (13С, 15N) MAS NMR spectroscopy and X-ray diffraction analysis. In the complex comprising the nonequivalent cations [Au{S2CN(C4H9)2}2]+ (A and B) and anions [TlCl4]–, the supramolecular self-assembly is provided by secondary bonds Au···S and S···Cl. The former are involved in the formation of isomeric binuclear cations [А···А] and [В···В] that build the (···[А···А]···[В···В]···)n polymeric chain; the latter selectively combine the thallium(III) anions and the dimeric cations. Thermolysis of the complex is accompanied by gold recovery and release of TlCl.
Strong chiroptical activity from achiral gold nanorods assembled with proteins
Shinmori, Hideyuki,Mochizuki, Chihiro
supporting information, p. 6569 - 6572 (2017/07/10)
The side-by-side assembly of gold nanorods and proteins, particularly human serum albumin, exhibits a distinct chiroptical activity in a wide range of visible and near-infrared wavelengths corresponding to the surface plasmon resonance. The anisotropy factor was the highest in a colloidal solution system and was able to be inverted by an external environment.
Large Cu i 8 chalcogenone cubic cages with non-interacting counter ions
Katam, Srinivas,Ganesan, Prabusankar
, p. 16615 - 16622 (2017/12/15)
Two mega size copper(i) cubic cages, [{Cu(Bptp)1.5}8(PF6-)](PF6-)7 (1) and [{Cu(Bpsp)1.5}8(PF6-)](PF6-)7 (2), supported by imidazole-2-chalcogenone ligands (Bptp = 2,6-bis(1-isopropylimidazole-2-thione)pyridine and Bpsp = 2,6-bis(1-isopropylimidazole-2-selone)pyridine) have been synthesized and characterized. The formation of ionic salts 1 and 2 was confirmed by FT-IR, multinuclear (1H, 13C, 31P and 19F) NMR, UV-vis, TGA, CHN analysis, BET analysis, single crystal X-ray diffraction and powder X-ray diffraction techniques. To the best of our knowledge, these are the first examples of a octanuclear copper(i) cluster in a perfect cubic architecture with a copper-copper distance of 8.413 ? or 8.593 ?. Interestingly, these anion-centered CuI8 cubic arrangements are not supported by cubic centered ions or face centered molecules. The formation of cationic cubic cages was accompanied by the association of twelve ligands (Bptp or Bpsp) with eight trigonal planar [CuSe3] vertices. The cationic charge of cubic cages was satisfied by eight PF6- counter anions, in which one of the PF6- anions occupies the centre of the Cu8 cube without any interaction. The copper(i) cubic cages are found to be highly active catalysts in click chemistry as well as hydroamination reactions. The scope of the catalytic reactions has been investigated with thirty-five different combinations of click reactions and six different combinations of the hydroamination of alkynes.
Multiple isomerization of structural units in ion-polymeric heteronuclear gold(III)–zinc(II) complex ([Au{S2CN(C4H9)2}2]2[ZnCl4])n: Chemisorption-based synthesis, supramolecular structure (self-organization of long-period cation–cationic polymer chains), and thermal behavior
Ivanov,Loseva,Rodina,Smolentsev
, p. 512 - 525 (2017/08/29)
Chemisorption of gold(III) from solutions in 2 M HCl with freshly precipitated binuclear zinc dithiocarbamate [Zn2{S2CN(C4H9)2}4] resulted in the formation of a polymeric heteronuclear gold(III)–zinc(II) dithiocarbamato-chlorido complex ([Au{S2CN(C4H9)2}2]2[ZnCl4])n (I), which was characterized by MAS 13C NMR, X-ray diffraction (CIF file CCDC no. 1526616), and simultaneous thermal analysis. Compound I isolated on a preparative scale was found to have a highly intricate supramolecular structure composed of 13 centrosymmetric and non-centrosymmetric isomeric complex cations, [Au{S2CN(C4H9)2}2]+, with 24 structurally non-equivalent BuDtc ligands, and six isomeric [ZnCl4]2– anions. The isomeric gold(III) cations perform different structural functions. Four and six cations are involved in the formation of two sorts of long-period cation–cationic chains (via pair non-valence secondary AuS bonds): (ABCDCB)n and (FGHIJK)n. The discrete E, L, and M cations and the [ZnCl4]2– complex anions are located alongside of the polymer chains and do not take part in the secondary interactions. According to simultaneous thermal analysis, thermolysis of I includes destruction of the dithiocarbamate moiety with reduction of gold to the metal in the cation and liberation of zinc chloride with partial conversion to ZnS in the anion.
Gold and palladium oxidation/complexation in water by a thioamide-iodine leaching system
Isaia, Francesco,Aragoni, Maria Carla,Arca, Massimiliano,Caltagirone, Claudia,Castellano, Carlo,De Filippo, Greta,Garau, Alessandra,Lippolis, Vito,Pivetta, Tiziana
, p. 4591 - 4599 (2017/10/13)
This paper concerns the oxidative dissolution ability of a thioamide/iodine leaching system in water towards gold, palladium and silver metals in powder in view of a potential application in the recovery process of these metals from electrical and electronic waste equipment (E-waste). The leaching mixture composed of equimolar amounts of thioamide 3-methyl-benzothiazole-2-thione and I2 in water can oxidize/complex gold and palladium metals in powder in order to form the complexes [AuI(mbtt)2]I3 and [PdII(mbtt)3I]I3. Considering the mild conditions under which the processes were performed ([I2] = 1.14 × 10-3 M, T = 20 °C, pH = 5.0, leaching time = 24 h), the obtained oxidation yield of Au0 and Pd0 are to be considered satisfactory with values of 65% and 69%, respectively. No oxidation was observed for the silver powder. The oxidising/complexing properties of the leaching mixture mbtt + I2 were interpreted considering the formation of the mbtt-I2 adduct that features, as a consequence of the S-donor to I2 interaction, a charge separation between the bridging and terminal iodine atoms in the fragment S-Ib-It. The feasibility of recovering gold from the complex [AuI(mbtt)2]I3 was verified by performing a cementation with magnesium powder.
Double complex salts [Au(En)2][Ir(NO2)6] ? nH2O (n = 0, 2), [Au(En)2][Ir(NO2)6]x[Rh(NO2)6]1–x ? nH2O (x = 0.25, 0.5, 0.75):
Makotchenko,Plyusnin,Shubin, Yu. V.,Baidina,Korol’kov,Sheludyakova,Korenev
, p. 12 - 21 (2017/02/26)
The double complex salts [Au(En)2][Ir(NO2)6] ? 2H2O (I) and [Au(En)2][Ir(NO2)6] (II) and solid solutions [Au(En)2][Ir(NO2)6]x[Rh(NOsu
