In the search for new drugs with more efficient active ingredients, various transition metals are being explored as potential metallopharmaceuticals. These compounds, which combine drugs with metals, have shown promis...In the search for new drugs with more efficient active ingredients, various transition metals are being explored as potential metallopharmaceuticals. These compounds, which combine drugs with metals, have shown promise as chemotherapeutic agents, akin to the accidental discovery of cisplatin and its organic derivatives in the late 20th century. This discovery transformed the sciences, particularly in the fields of organic and inorganic chemistry, by offering new insights into the compositions and molecular geometries of inorganic complexes through coordination chemistry, while also intersecting with other scientific domains such as pharmacology and medicine. To contribute to the development of new chemotherapeutic compounds through simple and reproducible synthetic processes, this study utilized rhodium(III) chloride hydrate (RhCl3.nH2O) to synthesize a series of compounds with the following organic N-heterocyclic ligands: 4,4'-dimethyl-2,2'-bipyridine, isonicotinamide, and N-(3-pyridyl)-isonicotinamide (3-pina). Two analytical techniques were employed to characterize the resulting materials: spectroscopic analysis in the infrared region, which suggested interactions and substitutions at the metal center by the organic compounds, and thermoanalytical analyses, which led to the proposal of minimum formulas for the compounds as follows: C1 [RhCl2(4,4'-Met-2,2'-bipy)2]Cl∙5/2H2O and C2 [Rh(4,4'-Met-2,2'-bipy)2(Iso)2] Cl3∙1/2H2O. However, the complexation of the third compound could not be confirmed due to the physicochemical characteristics of the resulting complex being very similar to those of the starting material, thereby validating the effectiveness of these techniques in differentiating and characterizing the synthesized salts. Due to their solubility in water and/or alcohol and thermal stability, the complexes were tested in biological media to assess cell viability in peripheral blood mononuclear cells. The solutions of these salts demonstrated favorable cell viability under the tested conditions, according to statistical analysis, obtaining average viability in the range of 95 ≤ x ≤ 100, with standard deviations between 3.29 ≤ x ≤ 4.44 for living cells.展开更多
The behaviour of poly(methyl methacrylate) was examined in the presence of phosphorus tri-bromide (PBr3) with varying concentrations. Films were cast from common solvent and subjected to TG, DTA, DTG, IR and Py-GC-MS ...The behaviour of poly(methyl methacrylate) was examined in the presence of phosphorus tri-bromide (PBr3) with varying concentrations. Films were cast from common solvent and subjected to TG, DTA, DTG, IR and Py-GC-MS for evaluating the degradation routes. Despite early decomposition of the blends, certain tempera-ture zones were identified for stabilization of the system. New products were found and mecha-nisms of their formation were proposed. Pyro-lysis of the blends was also carried out at dif-ferent temperatures to ascertain the nature of interaction between the constituents of the system.展开更多
文摘In the search for new drugs with more efficient active ingredients, various transition metals are being explored as potential metallopharmaceuticals. These compounds, which combine drugs with metals, have shown promise as chemotherapeutic agents, akin to the accidental discovery of cisplatin and its organic derivatives in the late 20th century. This discovery transformed the sciences, particularly in the fields of organic and inorganic chemistry, by offering new insights into the compositions and molecular geometries of inorganic complexes through coordination chemistry, while also intersecting with other scientific domains such as pharmacology and medicine. To contribute to the development of new chemotherapeutic compounds through simple and reproducible synthetic processes, this study utilized rhodium(III) chloride hydrate (RhCl3.nH2O) to synthesize a series of compounds with the following organic N-heterocyclic ligands: 4,4'-dimethyl-2,2'-bipyridine, isonicotinamide, and N-(3-pyridyl)-isonicotinamide (3-pina). Two analytical techniques were employed to characterize the resulting materials: spectroscopic analysis in the infrared region, which suggested interactions and substitutions at the metal center by the organic compounds, and thermoanalytical analyses, which led to the proposal of minimum formulas for the compounds as follows: C1 [RhCl2(4,4'-Met-2,2'-bipy)2]Cl∙5/2H2O and C2 [Rh(4,4'-Met-2,2'-bipy)2(Iso)2] Cl3∙1/2H2O. However, the complexation of the third compound could not be confirmed due to the physicochemical characteristics of the resulting complex being very similar to those of the starting material, thereby validating the effectiveness of these techniques in differentiating and characterizing the synthesized salts. Due to their solubility in water and/or alcohol and thermal stability, the complexes were tested in biological media to assess cell viability in peripheral blood mononuclear cells. The solutions of these salts demonstrated favorable cell viability under the tested conditions, according to statistical analysis, obtaining average viability in the range of 95 ≤ x ≤ 100, with standard deviations between 3.29 ≤ x ≤ 4.44 for living cells.
文摘The behaviour of poly(methyl methacrylate) was examined in the presence of phosphorus tri-bromide (PBr3) with varying concentrations. Films were cast from common solvent and subjected to TG, DTA, DTG, IR and Py-GC-MS for evaluating the degradation routes. Despite early decomposition of the blends, certain tempera-ture zones were identified for stabilization of the system. New products were found and mecha-nisms of their formation were proposed. Pyro-lysis of the blends was also carried out at dif-ferent temperatures to ascertain the nature of interaction between the constituents of the system.
