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Related Concept Videos

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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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
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.
Removing one hydrogen from the intervening CH2 group...
3.5K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
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...
47.5K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

11.4K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
11.4K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

4.4K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Updated: May 4, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Hexagonal bipyramidal [Ta(2)B(6)](-/0) clusters: B(6) rings as structural motifs.

Wei-Li Li1, Lu Xie, Tian Jian

  • 1Department of Chemistry, Brown University, Providence, RI 02912 (USA) http://casey.brown.edu/chemistry/research/LSWang/index.html.

Angewandte Chemie (International Ed. in English)
|December 20, 2013
PubMed
Summary

Researchers discovered stable, bipyramidal atomic clusters of tantalum and boron ([Ta2 B6]). These findings advance the search for novel nanomaterials and offer insights into boron

Keywords:
B6 ringab initio calculationsboron clustersphotoelectron spectroscopytantalum

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

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Area of Science:

  • Cluster science
  • Materials science
  • Inorganic chemistry

Background:

  • Atomic clusters are key building blocks for nanomaterials.
  • Boron exhibits unique polymorphism, with 3D cages in bulk and prevalent 2D clusters in the gas phase.
  • Planar boron clusters are potential ligands and building blocks.

Purpose of the Study:

  • To investigate the stable structures of tantalum-boron clusters, specifically [Ta2 B6](-) and [Ta2 B6].
  • To explore the potential of these clusters as novel nanomaterial components.

Main Methods:

  • Joint experimental and theoretical study.
  • Computational modeling and analysis of cluster structures.

Main Results:

  • The most stable structures for both neutral and anionic [Ta2 B6] clusters were identified as D6h bipyramidal.
  • This structure resembles the MB6M motif found in solid compounds.

Conclusions:

  • The discovery of stable D6h bipyramidal [Ta2 B6] clusters provides new candidates for nanomaterial construction.
  • These findings deepen our understanding of boron cluster chemistry and its relationship to bulk properties.