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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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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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Aromatic Hydrocarbon Cations: Structural Overview01:18

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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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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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...
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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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One Octasubstituted Trisalkoxotetradecavanadate Cluster.

Li Huang1, Xing Liu1, Jian Zhou1

  • 1Chongqing Key Laboratory of Inorganic Functional Materials, College of Chemistry, Chongqing Normal University, Chongqing 401331, P. R. China.

Inorganic Chemistry
|December 14, 2020
PubMed
Summary

Researchers synthesized a novel octasubstituted trisalkoxotetradecavanadate cluster using a hydrothermal method. This new V14 cluster incorporates a record number of tris(hydroxymethyl)aminomethane ligands and exhibits interesting magnetic and photocurrent properties.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polyoxometalates (POMs) are versatile nanoscale materials with diverse structures and properties.
  • Vanadate clusters, a subclass of POMs, are of interest for their catalytic and electronic applications.
  • The synthesis of novel, highly substituted vanadate clusters remains a challenge, limiting exploration of their potential applications.

Purpose of the Study:

  • To synthesize and characterize a novel octasubstituted trisalkoxotetradecavanadate cluster.
  • To investigate the structural features of the new cluster, particularly the incorporation of tris(hydroxymethyl)aminomethane (H3tri) ligands.
  • To explore the magnetic and photocurrent response properties of the synthesized vanadate cluster.

Main Methods:

  • Hydrothermal synthesis was employed to obtain the novel vanadate cluster.
  • Single-crystal X-ray diffraction was used for structural elucidation.
  • Magnetic susceptibility measurements were performed to study magnetic properties.
  • Photocurrent response was investigated to assess electronic behavior.

Main Results:

  • A novel octasubstituted trisalkoxotetradecavanadate cluster, [V14O18(tri)2(Htri)6(HCOO)2]·2H2O (1), was successfully synthesized.
  • Compound 1 represents a new structural type of fully reduced trisalkoxotetradecavanadate, featuring two interconnected trisalkoxoheptavanadate units.
  • The cluster incorporates an unprecedentedly high number of H3tri ligands.
  • Preliminary investigations revealed magnetic and photocurrent response properties.

Conclusions:

  • The hydrothermal method is effective for synthesizing complex, highly substituted vanadate clusters.
  • The unique structure of compound 1, with its high ligand incorporation, opens new avenues for POM research.
  • The observed magnetic and photocurrent properties suggest potential applications in areas such as molecular magnetism and photocatalysis.