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Related Concept Videos

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
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.
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...
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...
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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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
07:20

Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods

Published on: October 6, 2023

Cobalt(II) fluorophosphate frameworks.

Jennifer A Armstrong1, Edward R Williams, Mark T Weller

  • 1Chemistry, University of Southampton, Highfield Campus, Southampton, Hampshire, SO17 1BJ, UK.

Dalton Transactions (Cambridge, England : 2003)
|October 6, 2012
PubMed
Summary
This summary is machine-generated.

Nine novel cobalt fluorophosphate frameworks were synthesized using hydrothermal methods. These new materials exhibit unique structural features with bridging fluoride anions and potential for functional applications.

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Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Fluorophosphates are an important class of inorganic compounds with diverse structures.
  • Cobalt-based materials are of interest for various applications due to their magnetic and catalytic properties.

Purpose of the Study:

  • To synthesize and characterize new cobalt fluorophosphate frameworks.
  • To explore the structural diversity achievable under fluoride-rich hydrothermal conditions.

Main Methods:

  • Hydrothermal synthesis using CoF(3) and HPF(6) in a fluoride-rich medium.
  • Structure determination via single crystal X-ray diffraction.

Main Results:

  • Successfully synthesized nine new cobalt fluorophosphate frameworks.
  • Observed diverse structural motifs including chains, layers, and 3D frameworks.
  • Identified novel structural features involving μ(2), μ(3), and μ(4) bridging fluoride anions.
  • Characterized polyhedral linking of PO(3)F, PO(2)(OH,F)(2), and Co(O,F)(n) units (n=5-6).
  • Found that structures with inter-layer spaces and channels are often lined by terminal fluoride anions.

Conclusions:

  • Fluoride-rich hydrothermal conditions enable the formation of complex cobalt fluorophosphate frameworks.
  • The study expands the known structural chemistry of fluorophosphates.
  • The unique structural features, particularly bridging fluoride, may lead to interesting material properties.