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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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Colors and Magnetism03:02

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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Trinuclear Magnesium Imidazolate Borohydride Complex.

Maja Reberc1, Matjaž Mazaj2, Jernej Stare2

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A novel hybrid material combining metal-organic frameworks and borohydrides was synthesized. This new compound exhibits unique structural features and holds promise for future energy storage applications.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Metal-organic frameworks (MOFs) and borohydrides are important classes of materials with diverse applications.
  • Hybrid materials offer the potential to combine the advantageous properties of different material types.

Purpose of the Study:

  • To synthesize and characterize a new hybrid compound integrating MOF and borohydride properties.
  • To investigate the crystal structure and thermal stability of the synthesized material.
  • To explore the potential of this novel compound for energy storage applications.

Main Methods:

  • Solvothermal synthesis using magnesium borohydride and imidazole.
  • Single crystal X-ray diffraction for structural determination.
  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Density Functional Theory (DFT) quantum chemical calculations.
  • Synchrotron powder X-ray diffraction for phase transformation analysis.

Main Results:

  • A novel hybrid compound with a linear trinuclear magnesium complex bridged by {(Im)BH2(Im)} units was successfully synthesized.
  • Two solvates (acetonitrile and imidazole) and a subsequent layered phase Mg(Im3BH)2 were characterized.
  • The compounds exhibit thermal stability up to 160 °C and 220 °C, respectively.
  • The structure features reactive hydrogens bonded to boron and nitrogen, indicating potential for chemical reactivity.

Conclusions:

  • A new class of hybrid materials combining MOF and borohydride characteristics has been developed.
  • The synthesized compounds possess unique structural motifs and tunable thermal stability.
  • The presence of reactive hydrogen sites suggests significant potential for energy storage applications.