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Related Concept Videos

Metallic Solids02:37

Metallic Solids

16.4K
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...
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Valence Bond Theory02:42

Valence Bond Theory

8.9K
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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Ferromagnetism01:31

Ferromagnetism

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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 Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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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Ionic Crystal Structures02:42

Ionic Crystal Structures

18.0K
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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Ferromagnetic ordering in the layer-structured Pd(HS(2)O(7))(2).

Jörn Bruns1, Oliver Niehaus, Rainer Pöttgen

  • 1Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Strasse 9-11, 26129 Oldenburg (Germany), Fax: (+49) 441-798-3352.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 17, 2013
PubMed
Summary

Researchers synthesized novel palladium(II) hydrogendisulfate crystals, Pd(HS2 O7 )2, revealing an uncommon octahedral coordination. This structure exhibits paramagnetic behavior and ferromagnetic ordering at low temperatures.

Keywords:
hydrogen disulfatemagnetochemistrypalladiumstructure elucidation

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • Palladium chemistry in strong acid media is underexplored.
  • Understanding coordination environments of transition metals is crucial for materials design.

Purpose of the Study:

  • To synthesize and characterize a new palladium compound using oleum.
  • To investigate the structural, electronic, and magnetic properties of the synthesized compound.

Main Methods:

  • Reaction of elemental palladium with NO2 + CF3 SO3 - in oleum.
  • Single-crystal X-ray diffraction analysis.
  • Magnetic susceptibility measurements.

Main Results:

  • Violet single crystals of Pd(HS2 O7 )2 were obtained.
  • The crystal structure features Pd(2+) in an unusual octahedral coordination of six oxygen atoms from six hydrogendisulfate anions.
  • The compound exhibits paramagnetic behavior due to a d(8) high-spin configuration and shows ferromagnetic ordering below 8 K.

Conclusions:

  • A novel palladium hydrogendisulfate complex, Pd(HS2 O7 )2, has been successfully synthesized and characterized.
  • The unique coordination environment and resulting electronic configuration contribute to its interesting magnetic properties.
  • This study expands the known chemistry of palladium in highly acidic media and highlights potential for new magnetic materials.