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関連する概念動画

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Electron Configurations02:46

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
Naming Enantiomers02:21

Naming Enantiomers

The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three steps:...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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関連する実験動画

Updated: Jun 6, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

第1原理による計算によるレニウム二重合金におけるオーダーされた構造.

Ohad Levy1, Michal Jahnátek, Roman V Chepulskii

  • 1Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.

Journal of the American Chemical Society
|December 15, 2010
PubMed
まとめ
この要約は機械生成です。

レニウム合金に関するデータは稀です. 総合的な第一原理計算は,28のレニウム移行金属系のうち20の安定した構造を予測し,多くの報告されていない化合物を明らかにし,理解の見直しの必要性を示唆しています.

さらに関連する動画

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

関連する実験動画

Last Updated: Jun 6, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

科学分野:

  • 材料科学 材料科学とは
  • コンピューティング・マテリアル・サイエンス・サイエンス
  • 固体化学 固体化学

背景:

  • レーニウム (Re) は,触媒と超合金に不可欠です.
  • Reバイナリ合金に関する既存の実験データと計算データは限られている.
  • Re 移行金属システムのほんの一部しかよく特徴づけられていない.

研究 の 目的:

  • 二重レニウム過渡金属合金の相安定性を包括的に調査する.
  • 理論的計算を用いて安定した有序構造を予測する.
  • 潜在的な新しい化合物を特定し,Re合金システムの現在の理解を修正する.

主な方法:

  • ハイ・スループットなファースト・プリンシプルの計算を活用した.
  • 28の異なるレニウム移行金属バイナリ系を調査した.
  • 理論的な予測を既存の実験データと比較した.

主要な成果:

  • 28の調査されたReシステムのうち20の安定した秩序化された構造を予測した.
  • 以前に特徴づけられたシステムで既知の化合物をすべて再現した.
  • 報告されていない可能性のあるいくつかの安定化合物を特定しました.
  • 安定した化合物が形成されることが予測されていない8つのシステムを特定しました.

結論:

  • 理論的予測は,これまでに知られていたよりも,化合物を形成するRe合金システムの数が著しく高くなっていることを明らかにしています.
  • レーニウム合金相図に関する現在の理解を徹底的に見直す必要がある.
  • 理論的および実験的アプローチの組み合わせは,合金の正確な特徴付けに不可欠です.