Main Group Chemistry 

About: Main Group Chemistry is an academic journal published by IOS Press. The journal publishes majorly in the area(s): Chemistry & Crystal structure. It has an ISSN identifier of 1024-1221. Over the lifetime, 738 publications have been published receiving 3812 citations.

Metal complexes of hydrazones and their biological, analytical and catalytic applications: A review

Abstract: This is the first comprehensive review of the biological activity of hydrazone-transition metal complexes. Hydrazone complexes gained much attention because of their antifugial, antibacterial anticonvulsant, and analgesic, antiinflammatory, antimalarial, antimicrobial, antituberculosis, anticancer, and antiviral activities. Additionally, some of the hydrazone complexes were used in treatment of iron overload diseases. One application, which reflects the importance of hydrazone complexes, is their use in detection and determination of metals and some organic constituents in pharmaceutical formulations. This review will provide an overview of the biological, analytical and catalytic applications of this category of complexes.

Synthesis and Structural Characterization of New Hindered Aryl Phosphorus Centers (Aryl = 2,6-Dimesitylphenyl)

Abstract: The new sterically encumbered dichlorophosphine ArPCl2 (Ar = 2,6-dimesitylphenyl = Dmp,1) has been prepared from the corresponding aryliodide, n-butyllithium, and phosphorus trichloride. DmpPCl2 served as a precursor for the phosphinic acid DmpP(O)(OH)H(2), primary phosphine DmpPH2 (3), and diphosphene DmpP = PDmp (4). Compounds 2 and 4 have been crystallographically characterized. The solid state structure of 2 reveals the existence of dimeric phosphinic acids associated by hydrogen bonding in a manner analogous to carboxylic acid dimers. The P‒O distances are 1.508(2) and 1.521(2) A, and the O‒H and O‒H…O distances are 1.06(4) and 1.46(4), consistent with localized hydrogen bonding. The structure of 4 features a trans configuration about the P = P bond and short P = P bond length of 1.985 (2) A. Crystal data for compound 2: a = 9.4552(8) A, b = 11.174(1) A, c = 11.711(1) A, α = 65.775(8) A, β = 75.735(7)°, γ = 69.621(7)°, triclinic, P—1,Z = 2. Crystal data for compound 4: a = 10.940(1) A, b = 22.323(2) ...

Mercury adsorption on PdAu, PdAg and PdCu alloys

Abstract: Under specific conditions, sorbent materials such as activated carbon, metal oxides, metal sulfides and pure metals can effectively capture mercury (Hg). Among these materials activated carbon is one of the most widely-used sorbents because of its high removal capacity. Unfortunately, activated carbon can hinder the recycling of particulate matter for concrete manufacturing because it prevents concrete from meeting the freeze-thaw requirements. The use of a sorbent material that can capture Hg efficiently but is also concrete-friendly would allow for the increased sale of waste materials, ultimately oversetting landfill costs. In this work, density functional theory calculations have been used to predict the binding mechanism of Hg on the binary alloys PdAu(111), PdAg(111), PdCu(111) which are potential candidates for concrete-friendly sorbents. Although bulk Pd surfaces are more reactive than bare Au, Ag and Cu surfaces, the addition of small amounts of Au, Ag and Cu alloyed with the Pd acts to increase ...

Synthesis, Characterization and Reactivity of cis-cis-cis [ (C6H5)4Si4O4(OH)4]

Abstract: The hydrolytic condensation of PhSiCl3 (H2O/acetone, 0–5 C, 18 h) precipitates cis-cis-cis-[(C6H5)4Si4O4(OH)4] (5a) as the sole crystalline product in approximately 40% yield. The all-cis structure, which was originally assigned by J. F. Brown on the basis of IR spectroscopy and derivatization studies, was confirmed by a single-crystal X-ray diffraction study. The ether solvate of 5a crystallizes from Et2O/C6H6 as a hydrogen-bonded, dimeric structure, which kinetically stabilizes the molecule toward self-condensation reactions. In solution, particularly in the presence of weak amine bases, 5a rapidly self-condenses to form “T-resins”; self-condensation also occurs in the solid-state (25° C) over several months. Tetrasilanol 5a can be exhaustively silylated with Me3SiCl to afford excellent yields of cis-cis-cis-[(C6H5)4Si4O4(OSiMe3)4] (10), but all attempts to effect clean partial silylation produced complex mixtures of partially silylated T-resins. Attempts to effect catalytic hydrogenation of 5a to cis-c...

The Syntheses and Characterization of the Bulky Terphenyl Silanes and Chlorosilanes 2,6-Mes2C6H3SiCl3, 2,6-Trip2C6H3SiCl3, 2,6-Mes2C6H3SiHCl2, 2,6-Trip2C6H3SiHCl2, 2,6-Mes2C6H3SiH3, 2,6-Trip2C6H3SiH3 and 2,6-Mes2C6H3SiCl2SiCl3

Abstract: The synthesis and characterization of the primary terphenyl silanes and chlorosilanes 2,6-Mes2C6H3SiCl3 (1a), 2,6-Trip2C6H3SiCl3 (1b), 2,6-Mes2C6H3SiHCl2 (2a), 2,6-Trip2C6H3SiHCl2(2b) 2,6-Mes2C6H3SiH3(3a), 2,6-Trip2C6H3SiH3 (3b) and 2,6-Mes2C6H3SiCl2SiCl3(4), (where Mes = 2,4,6-Me3C6H2 and Trip = 2,4,6-i-Pr3C6H2) are described. Compounds (1a, 1b), (2a, 2b) and (4) were prepared by the reaction between SiCl4, SiHCl3 or Si2Cl6, respectively, and the appropriate aryl lithium reagent (2,6-Mes2C6H3Li or 2,6-Trip2C6H3Li·OEt2). Compounds (3a) and (3b) were prepared by reduction of (1a) and (1b) with LiAlH4, respectively. The derivatives (1a) - (3a) were characterized by 1H, 13C, 29Si NMR and IR spectroscopy. The structures of (1a), (1b) and (4) have been determined. Crystal data with CuKα (λ = 1.54178 A) at 130 K: (1a), a = 9.074(2) A, b = 16.681(3) A, c = 15.842(3) A, β = 105.20(3)°, V = 2313.9(8) A3, Z = 4, space group P21/c, 2772 (I > 2σ(I)) data, R = 0.042; (1b), a = 12.197(2) A, b = 25.602(5) A, c = 11.098(...