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111.
《Journal of Coordination Chemistry》2012,65(8):691-700
Equilibrium studies in aqueous solution are reported for dimethyltin(IV) complexes of zwitterionic buffers, such as bicine and tricine (L). Stoichiometry and stability constants for the complexes formed were determined at 25°C and ionic strength 0.1M NaNO3. The results showed the best fit of the titration curves were obtained for complexes MLH, ML, ML2, MLH-1, and MLH-2 with the hydrolysis products of the dimethyltin(IV) cation. The bonding sites of the dimethyltin(IV) complexes with bicine and tricine at different pH were characterized in the solid state by elemental analyses, FTIR, and TG analysis. The molecular formula of the complexes synthesized at pH=3.0 is [(CH3)2Sn(L)(H2O)]Cl while in neutral and alkaline media the hydrolytic species are formed. 相似文献
112.
《印度化学会志》2023,100(3):100945
The new dibutyltin(IV) complexes of Schiff bases is designed & synthesis from the interaction between various substituted amines and aromatic aldehyde with general formula Bu2Sn(L1-7)2Cl2. Where L1: (E)-4-chloro-N-(thiophen-2-ylmethylene) aniline; L2: (E)-2-chloro-N-(3,4,5-trimethoxybenzylidene) aniline; L3: (E)-N-((1H-indol-3-yl) methylene)-4-chloro-2-nitroaniline; L4: (E)-4-nitro-N-(3,4,5-trimethoxybenzylidene) aniline; L5: (E)-N-(3,4,5-trimethoxybenzylidene) aniline; L6: (E)-4-nitro-N-(thiophen-3-ylmethylene) aniline; L7: (E)-4-chloro-2-nitro-N-(pyridin-3-ylmethylene) aniline. Analytical and spectroscopic methods, such as molar conductance measurement, UV–Vis, IR, NMR, and DFT studies, have been used to describe newly synthesised compounds. The DFT studies have also provided confirmation regarding the complexes' geometry. The results of the Tauc equation indicate that the fundamental band gap of the compound [Bu2Sn(L5)2Cl2] is 2.670 eV, which is in agreement with the findings of DFT studies, which indicate that the band gap is 2.657 eV. The bactericidal effects of Schiff bases and their dibutyltin(IV) complexes were tested. The antibacterial activity of organotin(IV) complexes is enhanced in comparison to that of the free ligands. 相似文献
113.
María del Carmen Fernández-Ramírez Kevin Kan-Shing Ng Margarita Menéndez Douglas V. Laurents Rubén Hervás Mariano Carrión-Vázquez 《Angewandte Chemie (International ed. in English)》2023,62(19):e202209252
Understanding early amyloidogenesis is key to rationally develop therapeutic strategies. Tau protein forms well-characterized pathological deposits but its aggregation mechanism is still poorly understood. Using single-molecule force spectroscopy based on a mechanical protection strategy, we studied the conformational landscape of the monomeric tau repeat domain (tau-RD244-368). We found two sets of conformational states, whose frequency is influenced by mutations and the chemical context. While pathological mutations Δ280K and P301L and a pro-amyloidogenic milieu favored expanded conformations and destabilized local structures, an anti-amyloidogenic environment promoted a compact ensemble, including a conformer whose topology might mask two amyloidogenic segments. Our results reveal that to initiate aggregation, monomeric tau-RD244-368 decreases its polymorphism adopting expanded conformations. This could account for the distinct structures found in vitro and across tauopathies. 相似文献
114.
C60与正丙胺反应,然后分别与氯亚铂酸钾或三氯化铑配合,制得出含配位氮原子的富勒烯铂,铑 配合物,它们均能有效地催化烯烃与三乙氧基硅烷硅氢加成,铂配合物还对苯乙烯有独特的催化性能,以近100%的区域选择性得到α-加成产物,对催化机理进行了初步的探讨。 相似文献