[Cu(2)(HF(2))(H(2)O)(8)][FeF(6)]·2H(2)O.
Armel Le Bail1, Anne-Marie Mercier
1Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Université du Maine, 72085 Le Mans, France.
Summary
This study synthesized octaaqua-(hydrogenfluorido)dicopper(II) hexa-fluoridoferrate(III) dihydrate using hydrothermal methods. The research details the crystal structure, highlighting distorted copper coordination and extensive hydrogen bonding networks.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Materials Science
Background:
- Copper(II) and Iron(III) complexes are vital in various chemical and biological processes.
- Understanding the synthesis and structural properties of novel coordination compounds is crucial for developing new materials.
Purpose of the Study:
- To synthesize and characterize a novel copper-iron coordination compound, octaaqua-(hydrogenfluorido)dicopper(II) hexa-fluoridoferrate(III) dihydrate.
- To elucidate the crystal structure and hydrogen bonding interactions within the synthesized compound.
Main Methods:
- Hydrothermal synthesis technique.
- Single-crystal X-ray diffraction for structural analysis.
Main Results:
- Successful synthesis of octaaqua-(hydrogenfluorido)dicopper(II) hexa-fluoridoferrate(III) dihydrate.
- The crystal structure reveals dimeric [Cu(2)(H(2)O)(8)HF(2)](3+) units with distorted octahedral copper coordination.
- Extensive hydrogen bonding networks involving water molecules, fluoride ions, and [FeF(6)](3-) anions stabilize the crystal packing.
Conclusions:
- The study presents a novel copper-iron coordination compound with unique structural features.
- Hydrogen bonding plays a critical role in the self-assembly and stabilization of the crystal lattice.
- The findings contribute to the understanding of coordination chemistry and crystal engineering involving copper and iron.
Related Concept Videos
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.
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:
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:
Formation of Complex Ions
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...
Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Weak Acid Solutions
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
Water: A Bronsted-Lowry Acid and Base
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:


