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Related Concept Videos

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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Metallic Solids02:37

Metallic Solids

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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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 the dxy,...
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Ionic Crystal Structures02:42

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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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One-dimensional Magnus-type platinum double salts.

Christopher H Hendon1,2, Aron Walsh1,3, Norinobu Akiyama4

  • 1Department of Chemistry, Centre for Sustainable Chemical Technologies, University of Bath, Claverton Down, Bath BA2 7AY, UK.

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Researchers developed a simple crystallization method for unique platinum chains. These platinum compounds exhibit tunable colors and become conductive upon oxidation, opening new possibilities in platinum chemistry.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Platinum-chain complexes are of interest due to their unique oxidation states and physical properties.
  • The isolation of crystalline platinum chains has been a significant challenge despite compositional diversity.

Purpose of the Study:

  • To develop a simple crystallization technique for producing dimer-based 1D platinum chains.
  • To investigate the color-switching properties and electrical conductivity of novel platinum chain compounds.

Main Methods:

  • A straightforward crystallization technique was employed to synthesize platinum chains.
  • Color changes were observed in Pt(2+) compounds, and spontaneous oxidation in air was utilized.
  • Electrical conductivity measurements and quantum chemical calculations were performed.

Main Results:

  • A series of dimer-based 1D platinum chains were successfully isolated.
  • Pt(2+) compounds exhibited reversible color switching between yellow, orange, and blue.
  • Spontaneous air oxidation yielded black Pt(2.33+) needles with metallic properties and conductivity of 11 S cm⁻¹.

Conclusions:

  • A facile method for synthesizing crystalline platinum chains has been established.
  • The controllable color and tunable conductivity of these platinum materials offer new avenues in platinum chemistry.
  • The findings demonstrate potential for developing novel conductive materials based on platinum chains.