硒酸，是一种 无机化合物，化学式为H2SeO4。 外观为白色六方柱晶体，极易吸潮。 [1]主要用作分析试剂，也可用于有机合成。 2017年10月27日，世界卫生组织国际癌症研究机构公布的致癌物清单初步整理参考，硒和硒化合物在 3类致癌物 清单中。 [2] 外观：白色结晶性粉末，由于过冷现象，它在室温常维持液态。 [3] 溶解性：易溶于水，不溶于氨水，溶于硫酸。 [1]硒酸溶于水中可形成一水合物和四水合物。 [3] 固体硒酸是 正交晶系 晶体，晶胞参数 …

Selenate is the form required by organisms that need selenium as a micronutrient. These organisms have the ability to acquire, metabolize and excrete selenium. [ 7 ] The level at which selenium becomes toxic varies from species to species and is related to other environmental factors like pH and alkalinity that influence the concentration of ...

Selenium is a neutral atom with no charge until it gains or losses electrons. Selenium gains two electrons to complete its octet structure and forms selenide, Se2-. This is the more common charge it exhibits. In some other reactions, selenium will lose four of its valence electrons and form Se 4+. This selenium ion is not as common as the -2 ion.

Each oxidation form exhibits distinct toxicological and chemical characteristics (Santos et al., 2015). Se speciation plays a significant role in its environmental behavior and toxic influences...

2020年7月14日 · Se6+ is bonded to four O2- atoms to form SeO4 tetrahedra that share corners with six equivalent CuO6 octahedra. The corner-sharing octahedra tilt angles range from 49–59°. There are a spread of Se–O bond distances ranging from 1.66–1.75 Å. There are three inequivalent O2- sites.

2020年6月1日 · Pb 2 (SeO 3) (SeO 4) is centrosymmetric (CS) and crystalizes in the space group Pnma. Pb 2 (SeO 3) (SeO 4) exhibits a 3D framework composed of chains of edge-sharing [PbO 6] octahedra linked to [SeO 3] and [SeO 4] groups.

2023年5月23日 · Lewis structure of SeO4 2- ion contains two double bonds and two single bonds between the Selenium (Se) atom and Oxygen (O) atoms. The Selenium atom (Se) is at the center and it is surrounded by 4 Oxygen atoms (O). Let’s draw and …

2019年1月11日 · In the first Se6+ site, Se6+ is bonded to four O2- atoms to form SeO4 tetrahedra that share corners with two LiO4 tetrahedra and corners with two LiO4 trigonal pyramids. There are a spread of Se–O bond distances ranging from 1.65–1.69 Å.

Organic Chemistry Animations Introduction. Nucleophilic Addition to C=O. Borohydride reduction. Cyanide addition. Hemiacetal formation. Organometallic reagents. Grignard addition. Organolithium addition. Diastereoselective ketone reduction. Nucleophilic Substitution at C=O. Ester hydrolysis and transesterification.

Selenic acid is the inorganic compound with the formula H2SeO4. It is an oxoacid of selenium, and its structure is more accurately described as O2Se (OH)2. It is a colorless compound. Although it has few uses, one of its salts, sodium selenate is used in the production of glass and animal feeds. [3]