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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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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.
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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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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.
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Water-Soluble Pentagonal-Prismatic Titanium-Oxo Clusters.

Guanyun Zhang1, Caiyun Liu1, De-Liang Long2

  • 1Key Lab for Colloid and Interface Science of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University , Ji'Nan 250100, P. R. China.

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Researchers crystallized novel titanium-oxo clusters with a unique {Ti18O27} core. These stable, soluble clusters show promise for surface modifications and homogeneous photocatalysis applications.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Titanium oxide materials are crucial in catalysis and surface modification.
  • Controlling the crystallization of prenucleation clusters is key to synthesizing novel materials.

Purpose of the Study:

  • To synthesize and characterize a new family of titanium-oxo clusters.
  • To explore the potential applications of these clusters in surface modification and photocatalysis.

Main Methods:

  • Solubility control for crystallization of prenucleation clusters.
  • Electrospray ionization mass spectroscopy (ESI-MS).
  • (17)O Nuclear Magnetic Resonance (NMR) and vibrational spectroscopy.

Main Results:

  • Successful synthesis of titanium-oxo clusters with a {Ti18O27} core arranged in a triple-decked pentagonal prism.
  • The synthesized clusters exhibit good solubility and stability in various solvents like acetonitrile and water.
  • Characterization confirmed the unique structure and properties of the titanium-oxo clusters.

Conclusions:

  • The study presents a novel method for synthesizing titanium-oxo clusters.
  • These clusters are promising candidates for advanced applications in surface modification and homogeneous photocatalysis.
  • The findings open new avenues for designing functional titanium-based materials.