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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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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超陽子伝導性のユーテクティックCsHSO4-コーディネーションポリマーグラス

Nattapol Ma1, Nao Horike2, Loris Lombardo2

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

Journal of the American Chemical Society
|October 3, 2022
PubMed
まとめ
この要約は機械生成です。

超陽子伝導性を141°C以下で 実現する新型ガラスシステムを開発しました この突破は高度な伝導性があり 処理可能で透明なプロトン伝導体を提供しています

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科学分野:

  • 材料科学
  • 固体化学
  • 電気化学

背景:

  • セシウム硫酸水素 (CsHSO4) の超プロトン相移行は,高速なプロトン伝導を可能にしますが,141 °C以上の温度が必要です.
  • 既存のCsHSO4材料は,その高い動作温度と処理能力の欠如によって制限されています.
  • 低温で効率的に作動し 簡単に製造できる 固体プロトン伝導体の開発は 技術の進歩に不可欠です

研究 の 目的:

  • 超陽子伝導性を維持したCsHSO4基材料を 移行点より低い温度で作る
  • CsHSO4の処理能力を向上させ,デバイスの製造を容易にする.
  • 新しい材料システムにおける 陽子伝導性の強化の構造的起源を調査する.

主な方法:

  • 双対のCsHSO4コーディネーションポリマーガラスの形成は,ユーテクティックな融解を示している.
  • 温度範囲における無水質陽子の伝導性を測定する.
  • 固体核磁共振 (NMR) とX線ペア分布関数を用いた特徴付け.
  • 材料の粘度と薄膜特性 (抵抗性,透明性) の評価

主要な成果:

  • CsHSO4ガラスのシステムは,純CsHSO4よりも3倍の無水質陽子の伝導性を141°C以下で示しています.
  • 材料は,加湿なしに高温 (6.3 mS cm−1 at 180 °C) で高い伝導性を維持する.
  • 処理可能な粘度 (<103 Pa·s) を低温65 °Cで達成する.
  • 構造分析はオキシアニオン交換が 導電性の維持の鍵であることを明らかにした.
  • 低レジスティビリティと高光学透明性 (380~800 nmの間の85%以上) を有するマイクロメートルスケールの薄膜陽子導体の製造が実証されている.

結論:

  • 開発されたCsHSO4コーディネーションポリマーガラスシステムは,移行温度以下で超プロトン伝導性を成功裏に保ちます.
  • この材料は高陽子伝導性,低温処理性,光学透明性のユニークな組み合わせを提供します.
  • この発見により,先進的で効率的で汎用的な 固体プロトン伝導器を様々な用途で製造する道が開かれました