共查询到20条相似文献，搜索用时 15 毫秒
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Dihydroxytrimethylstiborane – Properties and Structure (CH3)3Sb(OH)2 · H2O ( 1 ) is prepared by reaction of (CH3)3SbCl2 and NaOH. 1 reacts with CO2 to yield [(CH3)3SbOH]2CO3 · 2 H2O ( 2 ). Thermogravimetric investigations and mass spectra show that 1 and 2 decompose at low temperature and low pressure to H2O, CO2 and (CH3)3SbO. The crystal and molecular structures of 1 and 2 are determined. 1 crystallizes orthorhombic (Pbca) with a = 1185.2, b = 1069.6, c = 1207.6 pm and Z = 8. 2 crystallizes in the acentric monoclinic space group Cc with a = 657.3, b = 1168.5, c = 2048.2 pm, β = 95,33° and Z = 4. The infrared spectra are discussed with regard to the hydrogen bonding. 相似文献
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Cumarines as fluorescent substances are widely spread in living nature and can be found in different genera of plants and fungi. Due to their intensive fluorescence they can be easily observed. This gives the opportunity to make experiments with low costs, low complexity and without using toxic materials. 相似文献
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Coordinatively Unsaturated Iron Chalcogenolate Complexes with Trigonal Planar Ligand Spheres – Synthesis, Properties, and Reactions with Nitrogen and Oxygen Donor Molecules The new bulky organo-selenium compound 2,4,6-triphenylbenzeneselenole ( 1 A ) was synthesized by a multistep-reaction from 1,3,5-triphenylbenzene. 1 A was converted by oxidation into the air-stable bis(2,4,6-triphenylphenyl)diselenide ( 1 B ), which was characterized by X-ray diffraction. The stepwise reaction of [Fe2{N(SiMe3)2}4] with 1 A leads to the complexes [Fe2(SeC6H2-2,4,6-Ph3)2{N(SiMe3)2}2] ( 2 ) and [Fe2(SeC6H2-2,4,6-Ph3)4] ( 3 ), controlled by their molar ratios. The conversion of 2 to 3 is also described. In addition, the coordinatively unsaturated thiolate complexes [Fe2{SC6H3-2,6-(SiMe3)2}2{N(SiMe3)2}2] ( 4 ) and [Fe2{SC6H3-2,6-(SiMe3)2}4] ( 5 ) were synthesized by stepwise reaction of [Fe2{N(SiMe3)2}4] with 2,6-bis(trimethylsilyl)benzenethiole. It is also possible to convert the heteroleptic compound 4 into the homoleptic thiolate complex 5 . During our investigations of the reactivity of 5 towards small electroneutral molecules, the compounds [Fe2{SC6H3-2,6-(SiMe3)2}4 · (MeCN)2] ( 6 ) and [Fe{SC6H3-2,6-(SiMe3)2}2(OPEt3)] ( 7 ) were obtained. 6 is the product of the addition of two molecules of acetonitrile to 5 . The iron atoms of 6 are coordinated by three sulfur and one nitrogen atom in a distorted tetrahedral manner. When 5 is treated with triethylphosphine oxide instead of acetonitrile, the mononuclear complex 7 with the coordination number three is formed. The iron atom is surrounded by two sulfur and one oxygen donor functions. 相似文献
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