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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
The Aufbau Principle and Hund's Rule03:02

The Aufbau Principle and Hund's Rule

To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the subshell of...
Weak Base Solutions03:21

Weak Base Solutions

Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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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:
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.

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Related Experiment Video

Updated: May 21, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

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Published on: October 27, 2018

K(2)[Fe(II) (3)(P(2)O(7))(2)(H(2)O)(2)].

Juan Yang1, Xin Zhang, Biao Liu

  • 1Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, Fujian Province, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|June 22, 2012
PubMed
Summary
This summary is machine-generated.

Dipotassium diaqua-bis-(diphosphato)triferrate(II) was synthesized, revealing a novel zigzag octahedral chain structure linked by diphosphate groups. Potassium ions further connect these layers into a network, expanding knowledge of iron diphosphate compounds.

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
08:46

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

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Area of Science:

  • Inorganic Chemistry
  • Crystal Engineering
  • Materials Science

Background:

  • Solvothermal synthesis is a key method for creating novel inorganic compounds.
  • Understanding the coordination chemistry and crystal structures of metal diphosphates is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize the novel iron diphosphate compound, dipotassium diaqua-bis-(diphosphato)triferrate(II).
  • To elucidate the crystal structure and bonding of the synthesized compound.
  • To investigate the role of potassium cations in the overall network structure.

Main Methods:

  • Solvothermal synthesis was employed for the preparation of the title compound.
  • Single-crystal X-ray diffraction was used to determine the detailed crystal structure.
  • Coordination geometry and bonding interactions were analyzed.

Main Results:

  • The crystal structure of K(2)[Fe(3)(P(2)O(7))(2)(H(2)O)(2)] was determined and found to be isotypic with its cobalt analogue.
  • Two distinct iron(II) coordination environments were observed: octahedral [FeO(6)] and pentagonal bipyramidal [FeO(5)(H(2)O)].
  • A zigzag octahedral chain structure was identified, linked by diphosphate groups into corrugated layers, with potassium ions forming an inter-layer network.

Conclusions:

  • The synthesis yielded a novel iron diphosphate with a unique layered structure.
  • The coordination and linking of iron polyhedra, diphosphate groups, and potassium ions create a complex three-dimensional network.
  • This study contributes to the understanding of structure-property relationships in metal diphosphates.