Zobrazeno 1 - 10
of 191
pro vyhledávání: '"Mangrich Antonio S"'
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 17, Iss 3, Pp 482-490 (2006)
In this work electrochemical and Ultraviolet-Visible studies were performed in solutions of salicylic acid models of humic and nitrohumic acids, a laboratory artifact, and molybdenum in order to determine the affinity of these models towards the meta
Externí odkaz:
https://doaj.org/article/54ab1d5038094416bca3eb51211e5cb8
Autor:
Rey Nicolás A., Santos Karina C. dos, Menezes Maria Â. B. C., Mangrich Antonio S., Pereira-Maia Elene C.
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 17, Iss 3, Pp 497-504 (2006)
Three new copper(II) complexes with the ligands quinuclidine [Cu(C7H13N)2(OH2)Cl]Cl.2H 2O (1), quinine [Cu(C20H23O2N2)(OH 2)2]ClO4 (2), and hydroquinidine [Cu(C20H27O2N2)(OH 2) Cl2]Cl.fraction one-halfH2O (3) have been isolated and characterized. The
Externí odkaz:
https://doaj.org/article/c7cd8a2bb50f411a9153e4ef4ddf5d4e
Autor:
Luiz Juciane B, Andrade Fabiano M. de, Sá Eduardo L. de, Friedermann Geraldo R, Mangrich Antonio S, Barclay J. Elaine, Evans David J, Hasegawa Tai, Nunes Fábio S
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 15, Iss 1, Pp 10-15 (2004)
2-Mercaptobenzoxazole pentacyanoferrate(II/III) complexes, [FeII/III(CN)5(bzoxs)]3-/2- , were prepared in MeOH/H2O 75:25% solutions and characterized by spectroscopic UV-Vis, Mössbauer, electron paramagnetic resonance (epr) and electrochemical-cycli
Externí odkaz:
https://doaj.org/article/f8659569d2a440caa47fb88b68d109f5
Autor:
Nunes Giovana G., Reis Dayane M., Camargo Pedro H. C., Hitchcock Peter B., Hörner Manfredo, Matos Robson M., Mangrich Antonio S., Sá Eduardo L. de, Leigh G. Jeffery, Soares Jaísa F.
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 14, Iss 6, Pp 922-929 (2003)
The novel binuclear titanium(IV) complex [{TiCl(OPr i)2(HOPr i )}2(mu-OPr i)2], 1, and the first mononuclear vanadyl(IV) chloroalcoholate [VCl(O)(HOPr i)4]Cl, 2, have been prepared from 2:1:1 mixtures of [Ti(OPr i)4], KOPr i and VCl3. Products were c
Externí odkaz:
https://doaj.org/article/8e46fa13ba8946b99427364475405e4e
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 14, Iss 5, Pp 777-789 (2003)
Two multisite 5,5'-disubstituted 2,2'-bipyridine ligands containing N-methyl hydroxamic acids as substituents [5,5'-bis(N-methylhydroxamic)-2,2'-bipyridine (4) and 5-methyl-5'-(N-methylhydroxamic)-2,2-bipyridine (10)] were synthesized. These ligands
Externí odkaz:
https://doaj.org/article/5084577862894f2db17c46607ba9c3c0
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 13, Iss 2, Pp 177-182 (2002)
Humic acids (HA) extracted from two coals of different ranks, from their regenerated samples and from a nitrated sample, were characterized by elemental analysis and by infra-red (FTIR), solid state 13C nuclear magnetic resonance (NMR) and eletronic
Externí odkaz:
https://doaj.org/article/3f2c7cda0b0d4f6886ff69577d9c6abb
Autor:
Lombardi Kátia C., Guimarães José L., Mangrich Antonio S., Mattoso Ney, Abbate Miguel, Schreiner Wido H., Wypych Fernando
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 13, Iss 2, Pp 270-275 (2002)
We report a structural and morphological characterization of the natural kaolinite PP-0559, from the Brazilian Amazon region, with the aim to contribute to the understanding of this clay mineral in environmental redox reactions. The triclinic structu
Externí odkaz:
https://doaj.org/article/9fb8a5d6f9a848428c5a892abb47f0d8
Autor:
Guimarães Elisete, Mangrich Antonio S., Machado Vanderlei G., Traghetta Dinis G., Lobo Maria A.
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 12, Iss 6, Pp 734-741 (2001)
Humic acids (HA) extracted from sheep (SHHA), cow (COHA), goat (GOHA) and rabbit (RAHA) vermicomposted manure were analyzed by electron paramagnetic resonance and hydrogen nuclear magnetic resonance spectroscopies. Carboxylic acids, amine, amide, est
Externí odkaz:
https://doaj.org/article/9b1d6899c3774973bbe1a26276d58138
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 12, Iss 6, Pp 791-798 (2001)
Galactomannans can be employed in food industries to modify the final rheological properties of the products. Since they are not absorbed by the living organisms they can also be used in dietary foods. The equilibria involving the interactions of Fe(
Externí odkaz:
https://doaj.org/article/6d72dc981b61473d9b6affb7a1c899fa
Evaluation of the complexes of galactomannan of Leucaena leucocephala and Co2+, Mn2+ , Ni2+ and Zn2+
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 11, Iss 3, Pp 224-231 (2000)
The binding constants for the complexed species formed in aqueous solution between galactomannan of Leucaena leucocephala and the metal ions Co2+, Mn2+, Ni2+ and Zn2+ were determined by potentiometric titrations. The calculated values showed Ni2+ as
Externí odkaz:
https://doaj.org/article/626c1a766e86442eb6218b31562d0bd1