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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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. Many...
Valence Bond Theory02:42

Valence Bond Theory

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Related Experiment Video

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

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

Published on: February 15, 2016

Copper-linked hexaniobate lindqvist clusters-variations on a theme.

Ranko P Bontchev1, Eugene L Venturini, May Nyman

  • 1Sandia National Laboratories, P.O. Box 5800, MS 0754, Albuquerque, New Mexico 87185, USA.

Inorganic Chemistry
|May 3, 2007
PubMed
Summary

New 1D materials and a dimer complex were synthesized by linking niobium-oxygen clusters with copper complexes. These structures show tunable properties based on copper species, with some forming extended solids for the first time.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • The Lindqvist ion, [Nb6O19]8-, is a versatile building block in inorganic chemistry.
  • Previous studies have primarily focused on incorporating this ion into discrete dimers or monomers.
  • Exploring the formation of extended solid-state structures with transition-metal complexes is an active area of research.

Purpose of the Study:

  • To synthesize and characterize novel one-dimensional materials and dimer complexes based on the [Nb6O19] cluster.
  • To investigate the influence of different copper complexes ([CuLx]n+) on the resulting chain structures.
  • To explore the formation of extended solids using the [Nb6O19] Lindqvist ion.

Main Methods:

  • Single-crystal X-ray diffraction for structure determination.
  • Thermogravimetric analysis (TGA) for thermal stability.
  • Fourier transform infrared (FTIR) spectroscopy for vibrational analysis.
  • Chemical analysis and magnetic measurements for composition and magnetic properties.

Main Results:

  • Five new compounds were synthesized: four 1D materials and one dimer complex.
  • The structures feature [Nb6O19] clusters linked by various [CuLx] species (L=ethylenediamine, NH3, H2O).
  • Compounds 2-5 represent the first extended solids formed by the [Nb6O19] ion with transition-metal cationic complexes.
  • The conformation, charge, and geometry of the chains are tunable by altering the [CuLx]2+ species.
  • Weak antiferromagnetic Cu2+-Cu2+ interactions were observed in all phases.

Conclusions:

  • The assembly of [Nb6O19] clusters with [CuLx] complexes under ambient conditions yields diverse one-dimensional structures.
  • The choice of [CuLx]2+ species allows for modulation of the resulting chain structures and their properties.
  • Compounds 2-5 demonstrate a new pathway for constructing extended solids with the [Nb6O19] Lindqvist ion.
  • These findings expand the structural diversity and potential applications of niobium-oxygen cluster-based materials.