- Synthesis and characterization of the adducts of bis(O-amyldithiocarbonato) nickel(II) with nitrogen donors and X-ray structure of bis(O- amyldithiocarbonato)bis (3,5-dimethylpyridine)nickel(II)
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A series of complexes with general formula M(Xan)2L2 (M = Ni(II), Xan = O-amyldithiocarbonato, L = 3-methylpyridine, 2,4-; 3,4-; 3,5-dimethylpyridines and 2,4,6-trimethylpyridine) have been synthesized and characterized by elemental analysis and various physico-chemical techniques such as magnetic susceptibility measurements, conductivity measurements, UV-Visible, Infrared spectral data. On the basis of electronic spectra and magnetic susceptibility measurements, an octahedral geometry has been proposed for all the complexes. IRspectral data shows that the substituted pyridines in all these complexes coordinate to the metal ion through nitrogen atoms occupying fifth and sixth axial positions where as O-alkyldithiocarbonate act as monoanion bidentate ligand and occupy the planar positions of octahedral structures. The X-ray diffraction analysis of one of the adducts bis(O-amyldithiocarbonato) bis(3,5-dimethylpyridine) nickel(II) is also investigated. The complex crystallizes in the monoclinic space group P21/c with unit cell parameters a = 9.167(2) A, b = 18.255(4) A, c = 9.299(2) A and β = 103.47(2)°. The dihedral angle between dithio-groups and the pyridine ring is 88.9(1)°. The crystal structure of the molecule is stabilized by π-π interactions. Springer Science+Business Media New York 2012.
- Singh, Kuldeep,Neerupama,Kour, Inderjeet,Sachar, Renu,Gupta, Vivek K.,Rajnikant, Verma
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- Synthesis, X-ray Single-Crystal Structural Characterization, and Thermal Analysis of Bis(O-alkylxanthato)Cd(II) and Bis(O-alkylxanthato)Zn(II) Complexes Used as Precursors for Cadmium and Zinc Sulfide Thin Films
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This work investigates tuning of the molecular structure of a series of O-alkylxanthato zinc and cadmium precursor complexes to enhance production of ZnS and CdS materials. The structures of several bis(O-alkylxanthato) cadmium(II) complexes (8-13) and bis(O-alkyl xanthato)zinc(II) complexes (18 and 19) are reported based on single crystal X-ray diffraction data. CdS and ZnS films were produced by the spin-coating of these metal complexes followed by their thermal decomposition to the corresponding metal sulfides. Thin films of CdS were deposited by spin-coating the bis(O-alkylxanthato) cadmium(II) precursors (7-13) on glass substrates, followed by annealing at 300 °C for 60 min. Thin films of ZnS were deposited by spin-coating bis(O-alkylxanthato) zinc(II) (14-20), followed by annealing at 200 °C for 60 min. The molecular complexes and solid state materials are characterized using a range of techniques including single-crystal X-ray diffraction, pXRD, EDS and XPS, DSC and TGA, UV-vis and PL spectroscopies, and electron microscopy. These techniques provided information on the influence of alkyl chain length on the thermal conditions required to fabricate metal sulfide films as well as film properties such as film quality, and morphology. For example, the obtained crystallite size of metal sulfide films formed is correlated to the hydrocarbon chain length of xanthate ligands in the precursor. The behavior of the complexes under thermal stress was therefore studied in detail. DTA and TGA profiles explain the relationship between hydrocarbon chain length, decomposition temperatures, and the energies required for decomposition. A higher decomposition temperature for complexes with longer hydrocarbon chains is observed compared to complexes with shorter hydrocarbon chains. Band-gap energies calculated from the optical absorption spectra alongside steady state and time-resolved photoluminescence studies are reported for CdS films.
- Bakly, Ali A.K.,Collison, David,Ahumada-Lazo, Ruben,Binks, David J.,Smith, Matthew,Raftery, James,Whitehead, George F. S.,O'Brien, Paul,Lewis, David J.
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supporting information
p. 7573 - 7583
(2021/05/26)
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- Production method of high-grade potassium xanthate
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The invention discloses a production method of high-grade potassium xanthate. The specific process of the method is as follows: mixing alcohol and flaky alkali, crushing and stirring to obtain a mixedsolution; transferring the mixed solution into a reaction kettle, slowly dropwise adding carbon disulfide, controlling the temperature of the system in the reaction kettle to be 30-35 DEG C in the dropwise adding process, continuously carrying out heat preservation reaction at 30-35 DEG C, and sequentially removing alcohol and drying the reacted system to obtain potassium xanthate. The preparation method comprises the following steps: adding flaky alkali into alcohol and carrying out wet crushing; so that the reaction is promoted, side reactions are reduced, and the conversion rate of materials is increased the grade of the potassium xanthate is increased to 95% or above, the problem that the grade of the potassium xanthate synthesized in the prior art is low is solved, an alkali grindingprocess is avoided, safe production is realized, and the environmental protection and safety pressure is reduced.
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Paragraph 0022-0024; 0089-0111
(2020/09/12)
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- Xanthates and trithiocarbonates strongly inhibit carbonic anhydrases and show antiglaucoma effects in vivo
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Dithiocarbamates (DTCs) were recently discovered as carbonic anhydrase (CA, EC 4.2.1.1) inhibitors. A series of xanthates and a trithiocarbonate, structurally related to the DTCs, were prepared by reaction of alcohols/thiols with carbon disulfide in the presence of bases. These compounds were tested for the inhibition of four human (h) isoforms, hCA I, II, IX, and XII, involved in pathologies such as glaucoma (CA II and XII) or cancer (CA IX). Several low nanomolar xanthate/trithiocarbonate inhibitors targeting these CAs were detected. A docking study of some xanthates within the CA II active site showed that these compounds bind in a similar manner with the dithiocarbamates, coordinating monodentately to the Zn(II) ion from the enzyme active site. Several xanthates showed potent intraocular pressure lowering activity in two animal models of glaucoma via the topical administration. Xanthates and thioxanthates represent two novel, promising classes of CA inhibitors.
- Carta, Fabrizio,Akdemir, Atilla,Scozzafava, Andrea,Masini, Emanuela,Supuran, Claudiu T.
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p. 4691 - 4700
(2013/07/19)
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- VIBRATIONAL ANALYSIS OF ALKYL XANTHATES
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Rotational isomers are indicated in the Raman spectra of sodium ethyl and other xanthates.Vibrational bands useful for characterizing xanthate solids and aqueous solutions are given.Vibrational analyses are reported for sodium ethyl xanthate, trans and gauche forms, and the methyl and isopropyl analogs using a Cartesian coordinate force field derived from ab initio molecular orbital calculations.
- Colthup, N. B.,Powell, L. Porter
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p. 317 - 322
(2007/10/02)
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