2,209.85
1.38
1,850

Recent PublicationsView all

  • [Show abstract] [Hide abstract]
    ABSTRACT: C26H37ClN2S4Sn, monoclinic, C2/c (no. 15), a = 29.2206(11) Å, b = 10.6749(4) Å, c = 19.6877(7) Å, β = 104.411(4)°, V = 5947.9 Å3, Z = 8, Rgt(F) = 0.0235, wRref(F2) = 0.0545, T = 100 K.
    No preview · Article · Jan 2015 · Zeitschrift für Kristallographie. New crystal structures
  • [Show abstract] [Hide abstract]
    ABSTRACT: The reactions of the Schiff base ligand (E)-4-chloro-N'-(2-hydroxy-4-methoxybenzylidene)benzohydrazide (L) with substituted dibenzyltin dichlorides yielded a series of monobenzyltin complexes with the general formula (RC7H6)Sn(L)(S)Cl, where R = p-CH3, p-Cl, H, p-F, p-Br, o-CH3, o-F and S = H2O, methanol. An exception to this was obtained for the reaction with di(o-chlorobenzyl)tin dichloride, in which the di(o-chlorobenzyl)tin complex, (o-ClC7H6)(2)Sn(L) was the sole product. An attempt to displace the solvent molecule in the monobenzyltin complexes with 4,4,-bipyridine resulted in a mixture of products, containing a co-crystal of the methanol coordinated monobenzyltin complex and 4,4-bipyridine, (RC7H6)-Sn(L)(CH3OH)Cl center dot 4,4-bipyridine, and a six-coordinated dibenzyltin complex, (RC7H6)(2)Sn(L)Cl center dot CH3OH. If the donor ligand 4,4'-bipyridine or 4,4'-bipyridine N,N'-dioxide (L') was added in-situ during the preparation of the benzyltin complexes, either a dibenzyltin complex, (RC7H6)(2)Sn(L), or a binuclear dibenzyltin complex with the donor ligand (L'), (RC7H6)(2)SnCl2(L') [R = p-F], was obtained. Interestingly, both cis- and trans-(RC7H6)(2)SnCl2(L') complexes could be formed, as evidenced from their crystal structures. The structural formula of all the products were confirmed by elemental analysis, IR, H-1 and C-13 NMR spectroscopic studies and by X-ray analysis.
    No preview · Article · Oct 2014 · Polyhedron
  • [Show abstract] [Hide abstract]
    ABSTRACT: Apparent catalytic effects of varying concentration of CTABr/MX/H2O nanoparticles (at a constant [CTABr] and [Piperidine]) on pseudo-first-order rate constants (kobs) for the reaction of piperidine with ionized phenyl salicylate have been measured as kobs/k0 where kobs and k0 represent rate constants in the presence and absence of MX, respectively. Symbols CTABr and MX represent respectively cetyltrimethylammonium bromide and 2,3- or 3,5-Cl2BzNa with Bz− = C6H3CO2−. At 6 mM CTABr, the maximum values of kobs/k0 are 7.9 and 9.0 at 300 mM 2,3-Cl2BzNa and 80 mM 3,5-Cl2BzNa respectively. Several-fold larger catalytic effects of 3,5-Cl2Bz− than that of 2,3-Cl2Bz− are attributed to ∼8-fold larger CTABr binding constant of 3,5-Cl2Bz− than that of 2,3-Cl2Bz−. Origin of CTABr/MX/H2O nanoparticles catalytic effects is related to the ability and efficiency of the expulsion of another counterion S− by the counterion X− from the cationic nanoparticles to the aqueous phase by means of the ion exchange process X−/S− at the cationic surface of nanoparticles.
    No preview · Article · Sep 2014 · Journal of the Taiwan Institute of Chemical Engineers
Information provided on this web page is aggregated encyclopedic and bibliographical information relating to the named institution. Information provided is not approved by the institution itself. The institution’s logo (and/or other graphical identification, such as a coat of arms) is used only to identify the institution in a nominal way. Under certain jurisdictions it may be property of the institution.