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Related Concept Videos

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.
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.

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Related Experiment Video

Updated: Jun 1, 2026

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
09:09

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

Published on: March 29, 2019

K(2)Ho(PO(4))(WO(4)).

Katherina V Terebilenko, Igor V Zatovsky, Vyacheslav N Baumer

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    A novel compound, dipotassium holmium(III) phosphate(V) tungstate(VI) (K(2)Ho(PO(4))(WO(4))), was synthesized. This new material features a unique framework structure with linked holmium-oxygen chains and phosphate/tungstate tetrahedra.

    Area of Science:

    • Inorganic Chemistry
    • Solid-State Chemistry
    • Crystallography

    Background:

    • Investigation of the K(2)O-P(2)O(5)-WO(3)-HoF(3) phase system is crucial for discovering new inorganic compounds.
    • Understanding structure-property relationships in complex phosphates and tungstates is an active area of research.

    Purpose of the Study:

    • To synthesize and characterize a new compound within the K(2)O-P(2)O(5)-WO(3)-HoF(3) system.
    • To elucidate the crystal structure of the newly discovered compound.

    Main Methods:

    • Flux technique utilized for the synthesis of the new compound.
    • Isotypical comparison with K(2)Bi(PO(4))(WO(4)) for structural insights.
    • Analysis of the framework structure involving HoO(8), PO(4), and WO(4) units.

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    Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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    Main Results:

    • Successful synthesis of dipotassium holmium(III) phosphate(V) tungstate(VI), K(2)Ho(PO(4))(WO(4)).
    • The compound was found to be isotypic with K(2)Bi(PO(4))(WO(4)).
    • Detailed description of the framework structure, including (∞)(2)[HoPO(4)] layers, (∞)(1)[HoO(8)] zigzag chains, and the arrangement of PO(4) and WO(4) tetrahedra.

    Conclusions:

    • The flux technique is effective for synthesizing complex inorganic compounds like K(2)Ho(PO(4))(WO(4)).
    • The determined crystal structure reveals a layered framework with specific coordination polyhedra and tetrahedral units.
    • The symmetry of the constituent units (HoO(8), PO(4), and WO(4)) was identified as 2.