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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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 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...
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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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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...
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Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Coordination Number and Geometry02:57

Coordination Number and Geometry

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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Cation ordering in the double tungstate LiFe(WO4)2.

Marjorie Albino1, Stanislav Pechev, Philippe Veber

  • 1ICMCB-CNRS, 87 Avenue du Dr Albert Schweitzer, 33608 Pessac cedex, France.

Acta Crystallographica. Section C, Crystal Structure Communications
|February 7, 2012
PubMed
Summary

Single crystals of lithium iron tungstate, LiFe(WO(4))(2), were successfully grown and analyzed. The monoclinic crystal structure was confirmed, offering a more accurate description than previous orthorhombic models.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Lithium iron tungstate (LiFe(WO(4))(2)) is a material with potential applications.
  • Accurate crystallographic data is crucial for understanding material properties.

Purpose of the Study:

  • To synthesize single crystals of LiFe(WO(4))(2).
  • To determine the precise crystal structure of LiFe(WO(4))(2).
  • To compare monoclinic and orthorhombic structural descriptions.

Main Methods:

  • High-temperature solution growth method for crystal synthesis.
  • Single-crystal X-ray diffraction for structural analysis.
  • Bond-valence sum calculations for structural validation.

Main Results:

  • Single crystals of LiFe(WO(4))(2) were obtained.
  • The crystal structure was refined in the monoclinic space group C2/c (R1=0.0177).
  • The monoclinic description provides a better fit and more accurate bond-valence sums compared to an orthorhombic refinement.

Conclusions:

  • The monoclinic space group C2/c is the preferred description for the LiFe(WO(4))(2) structure.
  • The refined structure provides more reliable bond-valence sum values.
  • This work refines the understanding of lithium iron tungstate crystallography.