Metal Coordinate Complexes
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. New Metal-Organic Systems with a Functionalized Oxamate-Type Ligand and MnII, FeII, CuII and ZnII
Four new complexes of formula [Fe(H2pcpa)2(H2O)2] (1), {[Mn(Hpcpa)(H2O)3]•1/2H2O}n (2), {[Zn(Hpcpa)(H2O)3]•1/2H2O}n (3) and [Cu2(Hpcpa)2(bipy)2]•8H2O (4) [H3pcpa = N-(4-carboxyphenyl)oxamic acid; bipy = 2,2¢-bipyridine] have been synthesized and their structures determined by X-ray diffraction. The structure of 1 consists of mononuclear iron(II) units
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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2. Supramolecular Approach to Decorate Multi-Walled Carbon Nanotubes with Negatively Charged Iron(II) Complexes
Poly(4-vinylpyridine) (P4VP) and P4VP/pentacyanoferrate(II) metallopolymer were used to suspend up to 1 mg mL-1 of multi-walled carbon nanotubes (MWCNT) in ethanol/water mixtures, providing noncolavent decoration of MWCNT with electroactive iron complex. The major interaction between polymer side chains and nanotubes is via π-π stacking, rather than charge
J. Braz. Chem. Soc.. Publicado em: 2017-01
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3. Desenvolvimento de Novos Metalofármacos Ativadores/Estimuladores da Enzima Guanilato Ciclase Solúvel / Development of Novel Activators metallodrugs / stimulators of soluble guanylate cyclase enzyme
Este trabalho é um esforço no sentido do desenvolvimento autóctone decomplexos coordenados com metais [Fe (II) e RU (II)] modelados a partir de grupos farmacofóricos que estimulam ou ativam a enzima guanilato ciclase solúvel(GCs). Para tanto, utilizou-se modelos in vitro de reatividades vascular (anéis de aorta) e medidas de pressão arterial in vivo p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2012
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4. SÍNTESE E ARRANJOS SUPRAMOLECULARES DE COMPLEXOS BIS(TRIAZENIDO) MACROCÍCLICOS E TRIAZENIDO 1-ÓXIDO COM OS CÁTIONS Cu2+, Ni2+, Cu+, K+. / SYNTHESIS AND SUPRAMOLECULAR ARRANGEMENTS OF BIS(TRIAZENIDE) MACROCYCLIC AND TRIAZENIDE 1-OXIDE COMPLEXES WITH Cu2+, Ni2+, Cu+, K+ CATIONS.
This work elaborates on the determination of crystal and molecular structures of four pro-ligands, emphasizing bis(triazenes), triazene 1-oxide and a new class of bis(triazenes) macrocyclic, and eight complexes involving Cu+, Cu2 +, Ni2 + and K+. Pro-ligands triazenes 1-oxide are relatively small and simple molecules. When they are deprotonated they presen a
Publicado em: 2010
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5. Reatividade de diazirinas e diaziridinas com compostos de paladio (II) em solventes proticos e aproticos
In this work, 3,3-pentamethylenediaziridine, N-methyl-3,3-pentamethylenediaziridine and N-cyclohexyl-3,3-pentamethylene diaziridine were prepared, as described in the literature. The coordination of these diaziridines with palladium(II) compounds was studied; these heterocycles react with bis-benzoni-trile-dichloropalladium(II), yielding air stable complexes
Publicado em: 1988
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6. Structural elements of metal selectivity in metal sensor proteins
Staphylococcus aureus CzrA and Mycobacterium tuberculosis NmtR are homologous zinc/cobalt-responsive and nickel/cobalt-responsive transcriptional repressors in vivo, respectively, and members of the ArsR/SmtB superfamily of prokaryotic metal sensor proteins. We show here that Zn(II) is the most potent negative allosteric regulator of czr operator/promoter bi
The National Academy of Sciences.
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7. Stereochemical Control of Valence and Its Application to the Reduction of Coordinated NO and N2
The electronic structures of transition metal complexes of NO are controlled by the stereochemistry about the metal atom (stereochemical control of valence). The six-coordinate complex, trans-[CoNO(NCS)-(C6H4 [As(CH3)2]2)2]+, consists of [Co(III)-(N=O-)]2+ (angleCo-N-O = 135°), while the pentacoordinate trigonal bipyramidal complex, [CoNO(C6H4[As(CH3)2]2)2]
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8. An x-ray absorption near edge structure spectroscopy study of metal coordination in Co(II)-substituted Carcinus maenas hemocyanin.
High-resolution x-ray absorption near edge structure spectroscopy was used to characterize the metal sites in three different cobalt-substituted derivatives of Carcinus maenas hemocyanin (Hc), including a mononuclear cobalt, a dinuclear cobalt and a copper-cobalt hybrid derivative. Co(II) model complexes with structures exemplifying octahedral, trigonal bipy
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9. Coordinate changes in heat shock element-binding activity and HSP70 gene transcription rates in human cells.
Activation of human heat shock gene transcription by heat shock, heavy metal ions, and amino acid analogs required the heat shock element (HSE) in the HSP70 promoter. Both heat shock- and metal ion-induced HSP70 gene transcription occurred independently of protein synthesis, whereas induction by amino acid analogs required protein synthesis. We identified a
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10. Neutral thiol as a proximal ligand to ferrous heme iron: Implications for heme proteins that lose cysteine thiolate ligation on reduction
Cysteine plays a key role as a metal ligand in metalloproteins. In all well-recognized cases, however, it is the anionic cysteinate that coordinates. Several cysteinate-ligated heme proteins are known, but some fail to retain thiolate ligation in the ferrous state, possibly following protonation to form neutral cysteine. Ligation by cysteine thiol in ferrous
The National Academy of Sciences.
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11. Preparation and Spectroscopic Studies of Cobalt(II) Derivatives of Blue Copper Proteins
Preparation of cobalt(II) derivatives of type 1 copper proteins has been extended to include bean plastocyanin and azurin from Pseudomonas aeruginosa. Fluorescence quenching data suggest that Co(II) binds to the type 1 site of both apoplastocyanin and apoazurin. Electronic absorption spectral measurements have been made for cobalt(II)-stellacyanin, cobalt(II