A Study on the Antioxidant Activity of Pyridylselenium Compounds and their Slow Release from Poly(acrylamide) Hydrogels
摘要:
The antioxidant activity of pyridylselenium compounds has been evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and nitric oxide (NO) scavenging methods. Pyridylselenium compounds have shown far superior (100-1000 times) antioxidant property than ebselen. The control release of bis(2-pyridyl) diselenide from poly(acrylamide) hydrogels has been studied in order to evaluate its release mechanism and diffusion coefficient. The later study also demonstrates that the pyridylselenium loading into the polymer matrix increases the magnitude and the rate of the radical scavenging activity of the poly(acrylamide) hydrogels.
A novel and convenient synthesis towards 2-pyridylselenium compounds: X-ray crystal structure of 4,4′-dimethyl-2,2′-dipyridyl diselenide and tris(2-pyridylseleno)methane
作者:K.K Bhasin、Jaspreet Singh
DOI:10.1016/s0022-328x(02)01627-3
日期:2002.9
hydrazine hydrate in sodium hydroxide reacts in situ with 2-bromopyridines to afford the title compounds in good to excellent yields. Hydrazine hydrate readily cleaves the selenium-selenium bond in these diselenides to generate 2-pyridylselenolate anion, which reacts with halomethanes to afford 2-pyridylseleno methanes. X-ray crystalstructure of 4,4′-dimethyl-2,2′-dipyridyl diselenide (4) and tris(2-pyridylseleno)methane
A mechanistic study of the synthesis, single crystal X-ray data and anticarcinogenic potential of bis(2-pyridyl)selenides and -diselenides
作者:Jaspreet S. Dhau、Avtar Singh、Amritpal Singh、Neha Sharma、Paula Brandão、Vítor Félix、Baljinder Singh、Vishal Sharma
DOI:10.1039/c5ra15577k
日期:——
A mechanistic study on LiAlH4 assisted scission of C–Se bond in bis(2-pyridyl)diselenides leading to bis(2-pyridyl)selenides generation has been presented.
Reactivity of 2-chalcogenopyridines with palladium–phosphine complexes: isolation of different complexes depending on the nature of chalcogen atom and phosphine ligand
作者:Rohit Singh Chauhan、G. Kedarnath、Amey Wadawale、Alexandra M. Z. Slawin、Vimal K. Jain
DOI:10.1039/c2dt30535f
日期:——
tellurolate complexes, [Pd2-TeC5H3(3-R)N}2(PPh3)2] (7a, 7b) which on prolonged standing in CDCl3 solution gave green crystals of [PdCl2-Te(Cl)2C5H3(3-Me)N}(PPh3)] (9). The molecular structures of TeC5H3(3-Me)N}2, [Pd2μ-TeC5H3(3-Me)N}2(dppp)2]Cl2·3H2O (5·3H2O), [Pd3(μ-Te)2(dppp)3]Cl2·3CHCl3 (6·3CHCl3) and [PdCl2-Te(Cl)2C5H3(3-Me)N}(PPh3)] (9) were established by single crystalX-ray diffraction
Copper(i) 2-pyridyl selenolates and tellurolates: Synthesis, structures and their utility as molecular precursors for the preparation of copper chalcogenide nanocrystals and thin films
作者:Rakesh K. Sharma、G. Kedarnath、Vimal K. Jain、Amey Wadawale、C. G. S. Pillai、Manoj Nalliath、B. Vishwanadh
DOI:10.1039/c1dt10461f
日期:——
the reaction between CuCl and NaEC5H3(R-3)N and were characterized by elemental analyses, uv-vis and NMR (1H, 13C) spectroscopy. The crystal structures of [CuSeC5H3(Me-3)N}]4 and [Cu(TeC5H4N)]4 revealed that the molecules are tetrameric in which each copper atom lies at the vertex of the tetrahedron and each face of the tetrahedron is capped by the bridging pyridylchalcogenolate ligand. Thermal behavior
通过CuCl和NaEC 5 H 3之间的反应分离出[Cu EC 5 H 3(R-3)N}} 4(E / R = Se / Me或Te / R; R = H或Me)络合物(R-3)N和通过元素分析,紫外可见和NMR(1 H,13 C)光谱进行表征。[Cu SeC 5 H 3(Me-3)N}] 4和[Cu(TeC 5 H 4 N)] 4的晶体结构揭示了分子是四聚体的,其中每个铜原子位于四面体的顶点,四面体的每个面都被桥联的吡啶硫属元素化物配体封端。通过热重分析研究了这些配合物的热行为。取决于反应条件,热解同时产生化学计量的和非化学计量的铜硫属元素化物,其通过XRD,EDX,SEM,TEM和SAED技术进行表征。这些前体用于制备纳米晶体和通过ACVD(气溶胶辅助化学气相沉积)沉积硫属铜化物的薄膜。
2-Pyridyl selenolates of antimony and bismuth: Synthesis, characterization, structures and their use as single source molecular precursor for the preparation of metal selenide nanostructures and thin films
作者:Rakesh K. Sharma、G. Kedarnath、Vimal K. Jain、Amey Wadawale、Manoj Nalliath、C. G. S. Pillai、B. Vishwanadh
DOI:10.1039/c0dt00263a
日期:——
NMR (1H, 13C and 77Se) spectroscopy. The single crystal X-ray analysis of [MSe–C5H3(Me-3)N}3]·nH2O (M/n = Sb/1.5 and Bi/0.5) revealed that the antimony complex adopts a trigonal pyramidal configuration with monodentate selenolate ligands while the bismuth analogue acquires a distorted square pyramidal configuration defined by two chelating and one monodentate selenolate groups. Pyrolysis of [MSe–C5H3(Me-3)N}3]
的反应 氯化锑3 和 氯化铋3 和 硒–C 5 H 3(R-3)N(M'=里 或者 娜; R =H或[Me],则得到通式[M Se–C 5 H 3(R-3)N} 3 ]的均硒化硒酸酯配合物(M =锑 或者 双)。通过元素分析,紫外可见和NMR(1 H,13 ℃ 和 77硒)光谱学。[M Se–C 5 H 3(Me-3)N} 3 ]·nH 2 O的单晶X射线分析(M / n =锑/1.5和 双/0.5)表明,锑配合物采用具有单齿硒烯酸酯配体的三角锥构型,而铋类似物则获得了由两个螯合和一个单齿硒烯酸酯基团定义的扭曲的方形锥体构型。[M Se–C 5 H 3(Me-3)N} 3 ]的热解在炉中或在十六烷基胺 (HDA)在不同温度下得到各种M 2 Se 3纳米结构。金属硒化物的薄膜也已经通过气溶胶辅助化学气相沉积(AACVD)沉积在玻璃基板上。紫外可见光谱,X射线衍射(XRD),扫描电子显微