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相关概念视频

Periodic Classification of the Elements04:00

Periodic Classification of the Elements

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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Noble Gases02:54

Noble Gases

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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The Periodic Table03:25

The Periodic Table

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As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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沉重的15组元素 帕克曼综合体

Pascal Schmidt1, Liesa Eickhoff2, Karsten Paul Lüdtke1

  • 1Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 3a, D-18059 Rostock, Germany.

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概括
此摘要是机器生成的。

卡利克斯[4]烯基宏循环与重型基物质 (As,Sb,Bi) 功能化,以创建新的基-基物质复合体. 一些复合物被分离和表征,揭示了有趣的动态和水解产物.

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科学领域:

  • 有机金属化学 有机金属化学
  • 宏观循环化学 宏观循环化学
  • 普尼克托基因的化学成分

背景情况:

  • 卡力克斯[4]烯基宏循环,也称为帕克曼联体,为协调金属离子和主要组元素提供了独特的支架.
  • 将重型菌素 (As,Sb,Bi) 纳入宏循环框架,为新型反应性带来了合成挑战和机遇.
  • 了解重型粉刺体的协调化学和反应性对于开发新材料和催化剂至关重要.

研究的目的:

  • 通过使用calix[4]pyrrole宏循环合成和描述新型素-pnictogen复合物.
  • 为了研究这些重型平素复合物的反应性和稳定性.
  • 探索从这些复合体中形成二基物种的潜力.

主要方法:

  • 素-基复合物 (Pac(EX) 2) 的合成,使用卡力克斯[4]pyrrole配体.
  • 使用光谱学 (NMR),晶体学和理论方法分离和描述复合物.
  • 研究复杂的动力学,水解和还原反应.

主要成果:

  • 成功合成和分离了 (III) 复合物Pac (AsCl) 2.
  • 形成但没有分离 (III), (III) 和 (III) 复合物.
  • 在 (III) 复合体中观察到温度和依赖的动态.
  • 从水解中发现的氧桥复合物 (Pac(E-O-E))
  • 在SbCl2合成过程中分离和表征了一种中间体PacH2 ((SbCl2) 2).
  • 暂时检测到石 (III) 的类似物.
  • 减少的尝试导致了分解,而不是激素的形成.

结论:

  • 卡利克斯[4]醇宏循环可以有效地将重型菌素纳入稳定的复合物中.
  • 合成的复合物表现出独特的反应性,包括水解和温度依赖的动态.
  • 在研究条件下,从这些复合体通过减少直接形成二基物种是不可行的.