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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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.
Removing one hydrogen from the intervening CH2 group...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

17.8K
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

28.4K
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...
28.4K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.5K
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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Related Experiment Video

Updated: Apr 23, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

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[U(III) {N(SiMe2 tBu)2 }3 ]: a structurally authenticated trigonal planar actinide complex.

Conrad A P Goodwin1, Floriana Tuna, Eric J L McInnes

  • 1School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 23, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a unique uranium(III) complex with a trigonal planar geometry, challenging previous assumptions for three-coordinate actinide compounds. This planar structure offers potential for developing new uranium(III) single-molecule magnets.

Keywords:
actinidesligand designligand effectssingle-molecule magnetsuranium

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Actinide Chemistry

Background:

  • Three-coordinate actinide complexes typically adopt trigonal pyramidal geometries.
  • Understanding the factors influencing coordination geometry is crucial for designing novel actinide compounds.

Purpose of the Study:

  • To synthesize and characterize a novel uranium(III) triamide complex.
  • To investigate the geometric preferences of three-coordinate actinide complexes.
  • To explore the potential of this complex in single-molecule magnet applications.

Main Methods:

  • Synthesis of the uranium(III) triamide complex [U(III)(N**)3].
  • Solid-state characterization of the complex.
  • Comparison with a known trigonal pyramidal uranium(III) complex [U(III)(N")3].
  • Theoretical calculations to understand geometric stabilization.

Main Results:

  • The uranium(III) triamide complex [U(III)(N**)3] unexpectedly exhibits a trigonal planar geometry.
  • This planar geometry is unprecedented for three-coordinate actinide complexes.
  • Sterically demanding ligands, like N**, can overcome the energetic preference for pyramidalization.
  • The planar geometry results in favorable magnetic dynamics.

Conclusions:

  • The synthesis of a planar three-coordinate uranium(III) complex challenges established geometric principles for actinides.
  • Steric bulk of ligands plays a critical role in determining the coordination geometry.
  • The observed magnetic dynamics suggest potential applications in the development of uranium(III) single-molecule magnets.