メタリック行動と周期的なバレンスの順序は,MMX連鎖化合物,Pt (((2) (((EtCS ((2)) (((4) I にある
M Mitsumi1, T Murase, H Kishida
1Department of Material Science, Himeji Institute of Technology, 3-2-1 Kouto, Kamigori-cho, Hyogo 678-1297, Japan.
Journal of the American Chemical Society
|November 8, 2001
まとめ
新しいプラチナ化合物は,電気伝導性を示し,205Kで金属半導体変異を経験する.構造とスペクトロスコピーの分析により,混合バルエンス状態と温度に依存する変化が明らかになり,複雑な電子行動を示す.
科学分野:
- 固体化学 固体化学
- マテリアルサイエンス 材料科学
- 無機化学 無機化学とは
背景:
- 一次元の (1-D) ハロゲンブリッジ混合バレンスの金属化合物は,そのユニークな電子的および構造的特性のために興味があります.
- ディプラチウム化合物は,複雑な電荷移転現象の探索のためのプラットフォームを提供します.
研究 の 目的:
- 新しい1Dハロゲンブリッジ混合バレンスのジプラチウム ((II,III)) 化合物を合成し,特徴づけること.
- その構造的,電子的,磁気的性質,特に電気伝導性と金属半導体変換を調査する.
主な方法:
- Pt ((2)) (((EtCS ((2)) ((4) I (3) の合成について
- UV-visible-near-IR,IR,偏光ラーマン光譜,X線光電子光譜 (XPS),X線結晶構造分析,電気輸送測定,変温X線 difraktion,X線拡散散射,およびSQUID磁気測定を用いた特徴付けを行いました.
主要な成果:
- 化合物3は,1Dの鎖構造に結晶し, -Pt-Pt-I-ユニットを繰り返します.
- 電気伝導度 (5-30 S cm(-1)) と金属半導体移行を205 Kで示しています.
- XPSはPt(2+) / Pt(3+) の混合値状態を示し,構造的およびスペクトル学的異常は移行温度と相関する.
結論:
- 合成された二プラチナ化合物は,魅力的な1D鎖の行動と金属半導体移行を示しています.
- 観測された現象は,Pt-Iフレームワーク内の混合バレンスの性質と温度に依存する構造変化に起因する.
さらに関連する動画
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
07:14Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
関連する概念動画
02:37Metallic 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...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:58Properties of Transition Metals
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
02:42Valence Bond Theory
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...
01:23Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.