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Updated: May 3, 2026

Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates
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金を"ダイヤモンド"に変える: Sr-Al-Auシステムの三角形のクラスターで相互接続された六角形のダイヤモンド型のAuフレームワークのファミリー

Andriy Palasyuk1, Yuri Grin, Gordon J Miller

  • 1Department of Chemistry, Iowa State University , Ames, Iowa 50011.

Journal of the American Chemical Society
|February 4, 2014
PubMed
まとめ

研究者らは,ユニークな3Dの金原子構造を持つ,ストロンチウム・金・アルミニウム間の金属化合物の新シリーズを発見した. これらの材料は,ストロンチウムからアルミニウム・ゴールド・フレームワークへの電荷の移転とともに,複雑な結合を示し,新しい化学相互作用を明らかにします.

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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.
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CFT focuses on...
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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...
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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...
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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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