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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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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Exceptions to the Octet Rule02:55

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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VSEPR Theory and the Effect of Lone Pairs04:01

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The Aufbau Principle and Hund's Rule03:02

The Aufbau Principle and Hund's Rule

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To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
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sp3d and sp3d 2 Hybridization
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関連する実験動画

Updated: Feb 16, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
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クサントイン・クォーテット (Au) (111)

Chong Chen1,2, Hongqian Sang3, Pengcheng Ding4

  • 1School of Chemistry & Chemical Engineering, Harbin Institute of Technology , Harbin 150001, China.

Journal of the American Chemical Society
|December 22, 2017
PubMed
まとめ

科学者たちは,金属のないピュリンの構造である,クザンチン (X) クォーテットを製造した. この発見は治療における 新しいDNA四重複の可能性と 生命の初期への洞察をもたらします

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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科学分野:

  • 生物化学
  • 超分子化学
  • 天体生物学

背景:

  • ザンチン (X) は,ヒトの組織と液体に含まれるピュリン基である.
  • グアニン (G) -クォーテットは,ピューリン構造として知られています.
  • ピューリン構造はDNAと生物学的プロセスに 根本的な役割を果たします

研究 の 目的:

  • シャンチン (X) クォーテットを初めて作り 視覚化しました
  • X四重奏とG四重奏の性質を比較する.
  • X四重奏の潜在的応用と起源を探求する.

主な方法:

  • シャンチン (X) クォーテットの製造と視覚化.
  • 安定性を決定するためにAu ((111) の表面研究.
  • グアニン (G) クォーテート組成による比較分析

主要な成果:

  • ザンチン (X) クォーテットは成功裏に製造され,視覚化されました.
  • X-クォーテットのネットワークは,A111上で最も高い安定性を示しています.
  • X四重奏は,G四重奏とは異なり,金属を含まない.

結論:

  • X四重奏は,遺伝子調節と抗腫瘍療法のための人工DNA四重複の可能性を持つ新しい,金属のないピューリン構造を表しています.
  • X四重体の固有のホモキラリティは,初期の地球における原始的なオリゴヌクレオチドの先駆者としての役割を示唆している.