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Related Concept Videos

Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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...
Electron Configurations02:46

Electron Configurations

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The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...

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Related Experiment Video

Updated: May 24, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
08:15

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Published on: February 11, 2012

Didysprosium hepta-nickel.

Volodymyr Levytskyy, Volodymyr Babizhetskyy, Bohdan Kotur

    Acta Crystallographica. Section E, Structure Reports Online
    |March 14, 2012
    PubMed
    Summary
    This summary is machine-generated.

    The Dy(2)Ni(7) compound crystallizes in the β-Gd(2)Co(7) structure. Researchers detailed its complex atomic arrangement, including multiple Dy and Ni sites and unique coordination polyhedra.

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    Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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    Published on: February 11, 2012

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    Published on: November 22, 2021

    Area of Science:

    • Solid State Chemistry
    • Crystallography
    • Materials Science

    Background:

    • Understanding intermetallic compound structures is crucial for materials development.
    • The Dy(2)Ni(7) compound's structural characteristics are not fully elucidated.
    • Frank-Kasper polyhedra are common in intermetallic phases.

    Purpose of the Study:

    • To determine the crystal structure of Dy(2)Ni(7).
    • To characterize the coordination environments of Dy and Ni atoms.
    • To identify the types of coordination polyhedra present in the Dy(2)Ni(7) structure.

    Main Methods:

    • Single-crystal X-ray diffraction was used to analyze the crystal structure.
    • Detailed crystallographic analysis was performed on the asymmetric unit.
    • Coordination polyhedra were identified and characterized based on atomic neighbors.

    Main Results:

    • Dy(2)Ni(7) adopts the β-Gd(2)Co(7)-type structure.
    • The asymmetric unit contains two distinct Dy sites and five distinct Ni sites.
    • Four types of Ni coordination polyhedra (Frank-Kasper icosahedra) and two types of Dy coordination polyhedra (pseudo and normal Frank-Kasper icosahedra) were identified.

    Conclusions:

    • The study provides a comprehensive structural description of Dy(2)Ni(7).
    • The identified coordination polyhedra offer insights into the bonding and stability of the intermetallic compound.
    • This detailed structural information is fundamental for further research into the properties of Dy(2)Ni(7).