金属化物形成素键:测量结合的能量
Dan A Smith1, Lee Brammer, Christopher A Hunter
1Department of Chemistry, University of York , Heslington, York, YO10 5DD, U.K.
Journal of the American Chemical Society
|January 2, 2014
概括
这项研究证明了化醇和 bis ((cyclopentadienyl) 金属化物之间的素结合. 这些素键比典型的键更强,表明了新的化学相互作用的潜力.
科学领域:
- 有机金属化学 有机金属化学
- 超分子化学 超分子化学
- 素结合 素结合
背景情况:
- 双 (cyclopentadienyl) 金属化物是多功能有机金属化合物.
- 素结合是一种重要的非共价相互作用,具有越来越多的应用.
- 了解素键强度对于设计新材料和催化剂至关重要.
研究的目的:
- 为了研究化和各种 bis ((cyclopentadienyl) 金属化物之间的素键的形成和强度.
- 量化这些素结合相互作用的热力学参数.
- 为了比较类似系统中的键与键的键强度.
主要方法:
- 使用质子核磁共振 (1H NMR) 光谱学来证明素键的形成.
- 异热定位热量计 (ITC) 用于确定相互作用和.
- 对于更具反应性的复合物,测量了低温关联常数.
主要成果:
- 在iodopentafluorobenzene和1-iodoperfluorohexane与bis ((cyclopentadienyl) 金属化物之间成功形成素键.
- 发现复合体1与C6F5I和C6F13I的相互作用度分别为-10.9 ± 0.4和-11.8 ± 0.3kJ/mol.
- 这些素键比与醇的键更强,其 ΔH° 值为 -7.3 ± 0.1 kJ/mol.
结论:
- 双 (cyclopentadienyl) 金属化物是有效的素键受体.
- 素键的强度可以通过金属中心和连接体来调节.
- 这项工作为金属有机系统中素结合的性质和强度提供了宝贵的见解.
更多相关视频
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
2.8K
12:43The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
Published on: November 28, 2016
7.9K
相关概念视频
Bond Energies and Bond Lengths
25.3K
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
25.3K
Hydrogen Bonds
11.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
11.9K
Hydrogen Bonds
109.5K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
109.5K
Alkyl Halides
16.8K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
16.8K
Covalent Bonding and Lewis Structures
54.9K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
54.9K
Halogens
17.2K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
17.2K
