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Articles by Heloisa Beraldo
Total Records ( 2 ) for Heloisa Beraldo
  Thays Dos Santos Silva , Leticia R. Teixeira , Roberta L. Ziolli , Sonia R. W. Louro and Heloisa Beraldo
  Iron(III) complexes [Fe(H2Fo4pT)Cl3] (1), [Fe(H2Ac4pT)Cl3] (2) and [Fe(H2Bz4pT)Cl3] (3) with N4-para-tolyl-thiosemicarbazones derived from 2-formyl (H2Fo4pT), 2-acetyl (H2Ac4pT) and 2-benzoylpyridine (H2Bz4pT) were prepared and characterized. EPR data for 1-3 reveal the presence of low-spin iron(III) with dxz2dyz2dxy1 ground state. Electrochemical studies of the complexes showed mostly metal-centered redox changes with a quasi-reversible Fe(III)/Fe(II) couple. H2Fo4pT and H2Ac4pT exhibited toxicity against Artemia salina at low doses (LD50 = 27.5 μM and LD50 = 4.7 μM, respectively). Upon coordination the toxicity increased substantially in the case of [Fe(H2Fo4pT)Cl3] (LD50 = 1.9 μM) and did not change for [Fe(H2Ac4pT)Cl3]. H2Bz4pT and its iron(III) complex were not soluble in water.
  Jeferson G. da Silva , Lucas S. Azzolini , Solange M.S.V. Wardell , James L. Wardell and Heloisa Beraldo
  Reaction of N(4)-phenyl-2-formylpyridine thiosemicarbazone (H2Fo4Ph), N(4)-phenyl-2-acetylpyridine thiosemicarbazone (H2Ac4Ph) and N(4)-phenyl-2-benzoylpyridine thiosemicarbazone (H2Bz4Ph) with gallium nitrate gave [Ga(H2Fo4Ph)2](NO3)3 (1), [Ga(2Ac4Ph)2]NO3 (2) and [Ga(2Bz4Ph)2]NO3 (3). In all complexes coordination of the thiosemicarbazone via the Npy–N–S chelating system occurs. In 1 the thiosemicarbazone acts as a neutral ligand while in 2 and 3 the ligand is anionic. Upon slow diffusion of 2 in DMSO [Ga(2Ac4Ph)2]NO3·DMSO (2a) was formed. The crystal structure of 2a was determined. Upon coordination the antibacterial activity of both gallium and thiosemicarbazones against Pseudomonas aeruginosa significantly increases.
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