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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.2K
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....
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.4K
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.
CFT focuses on...
31.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

52.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
52.4K
Unit Cells01:18

Unit Cells

34
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
34
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.3K
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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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Liquid-like cationic sub-lattice in copper selenide clusters.

Sarah L White1, Progna Banerjee2, Prashant K Jain1,2

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, CLSL A, 601 South Goodwin Avenue, Urbana, Illinois 61801, USA.

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Ultrasmall copper selenide clusters exhibit liquid-like ion movement at room temperature, unlike larger crystals. This unique property, driven by a disordered cationic sub-lattice, enables potential applications in fast electro-optic switches.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Super-ionic solids possess high ion mobility, crucial for applications like solid-state electrolytes and fast-ion conductors.
  • Fast-ion transport typically relies on disordered cation sub-lattices, often requiring high temperatures or pressures for phase transitions.

Purpose of the Study:

  • To investigate the cationic sub-lattice behavior in ultrasmall copper selenide clusters under ambient conditions.
  • To explore the potential of these clusters as components in advanced electronic devices.

Main Methods:

  • Synthesis and characterization of ultrasmall copper selenide (Cu2Se) clusters.
  • Analysis of cationic sub-lattice structure and ion mobility using advanced techniques.
  • Investigation of plasmonic properties and their tunability.

Main Results:

  • Ultrasmall Cu2Se clusters display a disordered, liquid-like cationic sub-lattice at room temperature, contrasting with larger nanocrystals and bulk materials.
  • A unique cationic arrangement stabilizes migration pathways through compressive strain within the clusters.
  • Tunable plasmonic properties were observed in the Cu2Se clusters.

Conclusions:

  • The room-temperature disordered cationic sub-lattice in ultrasmall Cu2Se clusters is a novel phenomenon.
  • These clusters offer a promising platform for developing fast electro-optic switches due to their ionic and plasmonic characteristics.