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    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
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    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
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    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
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