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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...
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.
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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...
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...
Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Fe(II)/Fe(III) Mixed-Valence Fluorophosphate Frameworks and Their Magnetic Characterization.

Feifan Li1, Xiedong Cheng1, Laura C J Pereira2

  • 1School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212100, China.

Inorganic Chemistry
|July 13, 2026
PubMed
Summary

Two novel mixed-valence fluorophosphate frameworks, (N2H5)Fe3(PO4)F6 and (NH4)4Fe5(PO4)2(PO3F)2F4(OH)2, exhibit unique 1D structural motifs influencing their magnetic properties.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Mixed-valence metal compounds offer tunable electronic and magnetic properties.
  • Fluorophosphate frameworks are of interest for their structural diversity and potential applications.
  • Understanding structure-property relationships in novel materials is crucial for scientific advancement.

Purpose of the Study:

  • To synthesize and characterize novel Fe(II)/Fe(III) mixed-valence fluorophosphate frameworks.
  • To elucidate the crystal structures and dimensionality of the synthesized compounds.
  • To investigate the magnetic behaviors and their correlation with structural features.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Mössbauer spectroscopy for characterizing iron valence states and magnetic ordering.
  • Magnetization measurements to probe magnetic transitions and interactions.

Main Results:

  • Synthesis and characterization of (N2H5)Fe3(PO4)F6 (I) and (NH4)4Fe5(PO4)2(PO3F)2F4(OH)2 (II).
  • Compound I exhibits a 3D framework with 1D channels and double chains; Compound II shows a 3D network with diamond chains.
  • Compound I undergoes an antiferromagnetic-to-ferromagnetic transition at 30 K; Compound II displays competing magnetic interactions below 40 K.

Conclusions:

  • The magnetic properties of both compounds are dictated by their respective 1D structural motifs (double chains in I, diamond chains in II).
  • These findings highlight the importance of structural dimensionality in controlling magnetic behavior in mixed-valence fluorophosphates.
  • The study provides insights into the design of new magnetic materials based on fluorophosphate frameworks.