Complex formation and cytotoxicity of Triapine derivatives: a comparative solution study on the effect of the chalcogen atom and NH-methylation
作者:Éva A. Enyedy、Nóra V. May、Veronika F. S. Pape、Petra Heffeter、Gergely Szakács、Bernhard K. Keppler、Christian R. Kowol
DOI:10.1039/d0dt03465g
日期:——
feasible chemical forms in solution, their stability and redoxproperties, as well as to reveal the relationships of the solution speciation and kinetic data with cytotoxic activity. The complex equilibria and redoxproperties of the complexes were characterized by the combined use of pH-potentiometry, UV-visible spectrophotometry, electron paramagnetic resonance spectroscopy, and cyclic voltammetry. These
α-N-杂环缩氨基硫脲是一类重要的研究性抗癌药物。最突出的代表是 3-氨基吡啶-2-甲醛缩氨基硫脲(Triapine),它在临床试验中显示出有希望的结果,目前正在 III 期评估。在这项研究中,我们研究了硫属元素原子从 S (Triapine) 交换到 O (O-Triapine) 和 Se (Se-Triapine) 的影响以及腙 NH 部分 (Me-Triapine) 的甲基化对其与 Fe 络合的影响( II )、Fe( III ) 和 Cu( II)) 离子及其细胞毒性。本研究的主要目的是表征和比较溶液中最可行的化学形式、它们的稳定性和氧化还原特性,并揭示溶液形态和动力学数据与细胞毒活性的关系。配合物的复杂平衡和氧化还原性质的特点是结合使用 pH 电位、紫外可见分光光度法、电子顺磁共振光谱和循环伏安法。这些结果表明,与 Triapine 相比,Se-Triapine 形成的 Cu( II
Oxidative addition of elemental selenium to 1,4,2,5-diazadiborinine
作者:Gillian Kor Hwee Goh、Yongxin Li、Rei Kinjo
DOI:10.1039/c9dt01081e
日期:——
synthesized and fully characterized. Computational studies revealed that compound 3 features a relatively small HOMO–LUMO gap (2.61 eV). When 3 was treated with elemental grey selenium (Se), oxidativeaddition of Se proceeded regioselectively at the boron centres of 3 to give a bicyclo[2.2.2] molecule 4 involving a B–Se–Se–B unit, which can be deemed a heavier analogue of dibora-peroxide.
Synthese des dianions du titre et addition de chlorures benzyliques. Obtention de seleniure, diseleniure, tellurure et ditellurure benzyliques
Synthese des dianions du titre et added de chlorures benzyliques。Obtention de seleniure, diseleniure, Tellurure et ditellurure benzyliques
Determination of the dissociation energy of selenium monoxide by the mass-spectrometric knudsen-cell method
作者:Simonne Smoes、Jean Drowart
DOI:10.1039/f29848001171
日期:——
Se2(g)+ SO(g) has been studied by the mass-spectrometric Knudsen-cell method in the temperature interval 1300–1800 K. It leads to the thermochemical value D°0(SeO)= 426.4 ± 6.3 kJ mol–1 for the dissociationenergy of the molecule SeO(g). By comparison with spectroscopic data, D°0(SeO)= 424.7+0.6–6.0 kJ mol–1 is retained as best present estimate of the dissociationenergy. The corresponding enthalpy of formation
On the Constituents of Aqueous Polyselenide Electrolytes: A Combined Theoretical and Raman Spectroscopic Study
作者:A. Goldbach、J. Johnson、D. Meisel、L. A. Curtiss、Marie-Louise Saboungi
DOI:10.1021/ja9836186
日期:1999.5.1
speciation of aqueous polyselenide solutions at high pH values has been investigated by Raman and UV/visabsorptionspectroscopy. Complementary, ab initio molecular orbital calculations at the HF/6-31+G* level of theory have been carried out on the vibrational frequencies of polyselenide dianions Sex2- (x = 2−4), polyselenide radicalanions Sex- (x = 2, 3), and protonated polyselenides HSex- (x = 1−3) in