12 documents found, page 1 of 2
Triethylphosphinegold(I) complexes with secnidazole-derived thiosemicarbazones:...
Oliveira, Ana P. A.; Freitas, Jennifer T. J.; Diniz, Renata; Pessoa, Claudia; Maranhão, Sarah S.; Ribeiro, Juliana M.; Souza-Fagundes, Elaine M.Triethylphosphinegold(I) complexes [Au(HL1)P(CH2CH3)3]PF6 (1), [Au(HL2)P(CH2CH3)3]PF6 (2), and [Au(HL3)P(CH2CH3)3]PF6 (3) were obtained with (E)-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)hydrazinecarbothioamide (HL1), (E)-N-methyl-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)hydrazinecarbothioamide (HL2), and (E)-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)-N-phenylhydraz...
Experimental and theoretical investigations of the [Ln(β-dik)(NO3)2(phen)2]⋅H2O...
Santos, Paulo R.S.; Pereira, Dariston K.S.; Costa, Israel F.; Silva, Iran F.; Brito, Hermi F.; Faustino, Wagner M.; Carneiro Neto, Albano N.In this work, the coordination compounds presenting the formulas [Eu(acac)(NO3)2 (phen)2]⋅H2O (Eu1) and [Eu(bzac)(NO3)2(phen)2]⋅H2O (Eu2), acac: acetylacetonate, bzac: benzoylacetonate and, phen: 1,10-phenantroline, were successfully synthesized and some spectroscopic properties were investigated by theoretical and experimental methods. These compounds were characterized via elemental analysis, FTIR spectroscop...
Síntese e cristalização de complexos com ligantes policarboxílicos
Diniz, Renata; Carmo, Weberton Reis doEstrutura Cristalina de um complexo de Cu(II) com Ligante Nitrogenado 4,4’- dimetil – 2,2’- bipiridinaNos últimos anos a Química Inorgânica Supramolecular tem sido uma área freqüentemente investigada devido às novas topologias estruturaisobtidas e a potencial aplicação de novos compostos em catálise, óptica e magnetismo (1). Sendo importante o controle de formação de polímeros decoordenação de duas e três dimen...
Oxocarbonos, pseudo-oxocarbonos e esquaraínas
Oliveira, Vanessa E. de; Diniz, Renata; Oliveira, Luiz Fernando C. de-; Oxocarbons ions are cyclic compounds presenting unusual electronic and vibrational properties. These molecules anions possess a high symmetry and degree of electronic delocalization, characteristics that have been discussed in several structural and spectroscopic investigations. Compounds in which one or more of the carbonyl oxygen atoms are replaced by other atoms or groups are called pseudo-oxocarbons. Com...
Estudos de determinação estrutural e espectroscopia vibracional de complexos me...
Diniz, Renata; Freitas, Maria Clara Ramalho; Souza, Márcia Cristina deEstrutura Cristalina e Estudo Espectroscópico do Complexo de Transferência de Carga entre o Ácido o-sulfobenzóico (SBZ) e a Base Nitrogenada 4,4`-trimetileno dipiridina (BPP) Na literatura são descritos inúmeros trabalhos envolvendo transferência de carga, o estudo deste pode revelar interessantes propriedades eletrônicas dos sólidos (1). Um caso especial de transferência de carga seria a transferência de próto...
Design of bio-based supramolecular structures through self-assembly of α-lactal...
Monteiro, Adenilson A.; Monteiro, Márcia R.; Pereira, Ricardo N.; Diniz, Renata; Costa, Angélica R.; Malcata, F. Xavier; Teixeira, José A.Bovine α-lactalbumin (α-La) and lysozyme (Lys), two globular proteins with highly homologous tertiary structures and opposite isoelectric points, were used to produce bio-based supramolecular structures under various pH values (3, 7 and 11), temperatures (25, 50 and 75 °C) and times (15, 25 and 35 min) of heating. Isothermal titration calorimetry experiments showed protein interactions and demonstrated that str...
NOVEL ZINC(II) DERIVATIVES OF PHENOL SCHIFF BASES: SYNTHESIS, CHARACTERISATION,...
Maia, José Roberto da Silveira; Santos, Ane Francielly da Silva; Souza, Marcia Cristina de; Diniz, RenataZinc(II)-Schiff base derivatives of general formula [Zn(L)Cl]n.xH2O {n = 2; x = 1, L = 3-hmp (1), L = 4-hmp (2); x = 0, L = hmyp (3)} were synthesized by the condensation reaction of aminophenol with 2-hydroxybenzaldehyde. The Schiff bases in complex-1, 2 and 3 are bonded to the metal through the nitrogen and oxygen atoms. These complexes have dimeric structures with bridging oxygen atoms; the metal is at the c...
Comparação estrutural entre amostras de materiais tipo hidrotalcita obtidas a p...
Chagas, Luciano H.; Farias, Stephane B. P. de; Leitão, Alexandre A.; Diniz, Renata; Chiaro, Sandra S. X.; Speziali, Nivaldo L.; Abreu, Heitor A. de-; Three samples of hydrotalcite-like materials (HTC) were synthesized and their structural characteristics were compared with two HTCs obtained commercially. Thermal analyses, FT-IR, PXRD and textural analyses were used to investigate the structural differences between commercial and synthetic samples. Particularly, the memory effect was observed at temperature higher than 600 ºC. The Rietveld refinements were...
Antimicrobial effect of oligomeric copper(ii) derivatives of bis(pyrimidin-2-yl...
Silva, Ricardo Soares Mota; Souza, Márcia Cristina de; Berlini, Lilian; Maia, José Roberto da Silveira; Diniz, Renata; Speziali, Nivaldo LúcioA novel series of copper(II) derivatives of bis(pyrimidin-2-ylthio)- and bis(4,6-dimethylpyrimidin-2-ylthio)alkane of general formula [Cu x Cl y (L) z ] n {x = 1, y = 2, z = 1, L = ptm (1), pte (2), dptm (4), dpte (5), dpth (6); x = 2, y = 4, z = 3, L = pth (3)} were tested for antimicrobial activity. These complexes were characterized by elemental analysis, infrared spectroscopy (IR) and gel permeation chromat...
ANTIMICROBIAL EFFECT OF OLIGOMERIC COPPER(II) DERIVATIVES OF BIS(PYRIMIDIN-2-YL...
Silva, Ricardo Soares Mota; Souza, Márcia Cristina de; Berlini, Lilian; Maia, José Roberto da Silveira; Diniz, Renata; Speziali, Nivaldo LúcioA novel series of copper(II) derivatives of bis(pyrimidin-2-ylthio)- and bis(4,6-dimethylpyrimidin-2-ylthio)alkane of general formula [CuxCly(L)z]n {x = 1, y = 2, z = 1, L = ptm (1), pte (2), dptm (4), dpte (5), dpth (6); x = 2, y = 4, z = 3, L = pth (3) were tested for antimicrobial activity. These complexes were characterized by elemental analysis, infrared spectroscopy (IR) and gel permeation chromatography ...