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.
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
A new polymorphic modification and chemisorption activity of mercury(II) N,N-di-iso-propyldithiocarbamate: Synthesis and characterisation of the heteronuclear double complex of ([Au{S2CN(iso-C3H7)2}2]2[Hg2Cl6]·OC(CH3)2)n
Loseva, Olga V.,Rodina, Tatyana A.,Smolentsev, Anton I.,Ivanov, Alexander V.
, p. 238 - 245 (2017/07/10)
A new crystalline modification (γ-form, 1) of the mercury(II) N,N-di-iso-propyldithiocarbamate (Hg-iso-PDtc) has been identified and structurally characterised using single-crystal X-ray diffraction analysis. The crystal structure of 1 is presented by centrosymmetric binuclear molecules of [Hg2{S2CN(iso-C3H7)2}4], in which the mercury atoms are interconnected by two tridentate bridging iso-PDtc ligands. The chemisorption activity of the freshly precipitated Hg-iso-PDtc was tested with respect to gold(III) in a 2?M HCl solution. The novel heteronuclear gold(III)–mercury(II) double complex was found to be the sole gold-containing product of the chemisorption. The isolated compound was crystallised as a solvated form, ([Au{S2CN(iso-C3H7)2}2]2[Hg2Cl6]·OC(CH3)2)n (2). It was revealed that compound 2 adopts a polymeric structure comprising two types (‘A’ and ‘B’) of isomeric gold(III) cations [Au{S2CN(iso-C3H7)2}2]+ and centrosymmetric binuclear mercury(II) anions [Hg2Cl6]2–. The supramolecular self-organisation of 2 occurs due to the relatively weak Au···S secondary interactions between neighbouring isomeric [Au{S2CN(iso-C3H7)2}2]+ cations resulting in the formation of linear cation-cationic chains of (?‘A’?‘B’?‘A’?‘B’?)n. The thermal behaviour of polycrystalline samples of Hg-iso-PDtc and 2 was studied by simultaneous thermal analysis (STA). It was shown that thermal decomposition is accompanied by the formation of HgS (for the original mercury(II) complex) or quantitative reduction of gold(III) to elemental gold and formation of HgCl2 along with its partial transformation to HgS (for 2).
Electron-density distribution tuning for enhanced thermal stability of luminescent gold complexes
Yamada, Shigeyuki,Yamaguchi, Shun,Tsutsumi, Osamu
, p. 7977 - 7984 (2017/08/17)
Structure-property relationships of newly synthesized luminescent gold complexes were examined from the viewpoint of material applications. In particular, we investigated the effect of controlling the molecular electron-density distribution by introducing trifluoromethyl substituents into the complexes. The structures of the molecular aggregates were not affected by the trifluoromethyl substituents, as all the complexes formed antiparallel dimers in the crystal state. Moreover, we found that the trifluoromethyl substituents enhanced the thermal stability of the complexes without significantly changing the luminescence behaviour. Thus, while the thermal stability of these materials depends on the molecular structure, i.e. the molecular electron-density distribution, the luminescence behaviour mainly depends on the molecular aggregate structure. These results suggest that various material properties, e.g. luminescence colour and thermal stability, can be controlled independently by tuning the structures of molecules and molecular aggregates using trifluoromethyl substituents.
