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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
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
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

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Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
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Cooperative Iron(II) spin crossover complexes with N4O2 coordination sphere.

Birgit Weber1, Eike Kaps, Jan Weigand

  • 1Department of Chemistry and Biochemistry, Ludwig Maximilian University Munich, Butenandtstrasse 5-13 (Haus D), D-81377 München, Germany. bwmch@cup.uni-muenchen.de

Inorganic Chemistry
|December 22, 2007
PubMed
Summary

Two novel spin crossover complexes exhibit cooperative spin transitions with distinct thermal hysteresis loops. Complex 2 shows potential for photomagnetic applications, demonstrating light-induced excited spin state trapping.

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Solid-State Physics

Background:

  • Spin crossover (SCO) complexes are molecular materials exhibiting a reversible switch between low-spin and high-spin states.
  • SCO phenomena are driven by external stimuli like temperature, pressure, or light, making them promising for molecular devices.
  • Investigating SCO complexes with cooperative transitions is crucial for understanding and designing advanced functional materials.

Purpose of the Study:

  • To synthesize and characterize two new spin crossover complexes, [FeL(py)(2)] (1) and [FeL(DMAP)(2)] (2).
  • To investigate their spin transition properties, including cooperativity and thermal hysteresis.
  • To explore potential photomagnetic behavior and light-induced effects.

Main Methods:

  • Temperature-dependent magnetic susceptibility measurements.
  • Thermogravimetric analysis (TGA).
  • Mössbauer spectroscopy and X-ray structure analysis.
  • Temperature-scanning calorimetry.
  • Reflectivity measurements and SQUID magnetometry.

Main Results:

  • Both complexes displayed cooperative spin transitions with varying thermal hysteresis widths (2 K for complex 1, 9 K for complex 2).
  • X-ray analysis revealed elastic interactions driving cooperativity, more pronounced in complex 2 due to short Fe-Fe distances.
  • The spin transition correlated with a change in the O-Fe-O angle.
  • Complex 2 exhibited photomagnetic properties, including light-induced excited spin state trapping (LIESST) at 53 K.

Conclusions:

  • The synthesized iron(II) complexes exhibit cooperative spin crossover behavior driven by elastic interactions.
  • Complex 2 demonstrates significant photomagnetic properties, indicating potential for light-switchable molecular devices.
  • The study provides insights into the structure-property relationships governing SCO phenomena.