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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.
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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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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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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Large decanuclear calcium and strontium hydride clusters.

Johannes Martin1, Jonathan Eyselein1, Jens Langer1

  • 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Inorganic and Organometallic Chemistry, Erlangen, Bavaria, Germany. sjoerd.harder@fau.de.

Chemical Communications (Cambridge, England)
|July 14, 2020
PubMed
Summary

Two new decanuclear metal hydride clusters were synthesized. These compounds contain a novel [Ae10H16]4+ core structure with unique hydride arrangements.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Metal hydride clusters are of interest for their unique structural motifs and potential applications.
  • The synthesis and characterization of large, polynuclear metal hydride complexes remain a significant challenge in inorganic chemistry.

Purpose of the Study:

  • To isolate and characterize novel decanuclear metal hydride clusters.
  • To elucidate the structural features of the [Ae10H16]4+ core in calcium and strontium derivatives.

Main Methods:

  • Synthesis of decanuclear clusters with the general formula Ae10H16[N(R)R']4·(PMDTA)2, where Ae = Ca, Sr.
  • Structural analysis of the isolated compounds, likely involving X-ray diffraction and spectroscopic techniques.

Main Results:

  • Successful isolation of two large decanuclear hydride clusters: [Ca10H16][N(R)R']4·(PMDTA)2 and [Sr10H16][N(R)R']4·(PMDTA)2.
  • Determination of a [Ae10H16]4+ core structure composed of two edge-shared metal octahedra.
  • Identification of interstitial hydrides within the octahedra and hydrides capping triangular faces of the core.

Conclusions:

  • The study reports the synthesis and structural characterization of unprecedented decanuclear calcium and strontium hydride clusters.
  • The novel [Ae10H16]4+ core represents a new structural motif in metal hydride cluster chemistry.