Related Experiment Video
Updated: Oct 11, 2025
07:56
Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
Published on: August 12, 2019
8.1K
Fe4(OAc)10[EMIM]2: Novel Iron-Based Acetate EMIM Ionic Compound
Godwin Severa1, Edward Bruffey1, Phuong Q H Nguyen2
1Hawai'i Natural Energy Institute, University of Hawai'i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States.
ACS Omega
|December 6, 2021
Summary
We synthesized novel iron(II) coordination compounds, Fe4(OAc)10[EMIM]2, in anhydrous and dihydrate forms. These compounds exhibit properties of metal-containing ionic liquids and possess porous structures with potential for molecular accommodation.
Area of Science:
- Coordination Chemistry
- Materials Science
- Ionic Liquids
Background:
- Novel iron(II) aceto EMIM coordination compounds were synthesized and characterized.
- Two hydration forms were obtained: anhydrous monoclinic and triclinic dihydrate Fe4(OAc)10[EMIM]2·2H2O.
- The dihydrate is isostructural with the manganese counterpart, suggesting potential for solid solutions.
Purpose of the Study:
- To synthesize and characterize novel iron(II) coordination compounds with EMIM acetate.
- To investigate the structural, thermal, and decomposition properties of these compounds.
- To explore their potential as metal-containing ionic liquids and porous materials.
Main Methods:
- Synthesis and characterization of iron(II) aceto EMIM coordination compounds.
- X-ray diffraction for structural analysis.
- Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) for thermal properties.
- Temperature-programmed desorption mass spectrometry (TPD-MS) for decomposition pathway analysis.
- Variable-temperature infrared (VT-IR) spectroscopy for phase transition studies.
Main Results:
- The compounds feature chains of Fe2+ coordinated by acetate groups, with EMIM moieties interacting via non-covalent forces.
- Melting point around 94 °C classifies them as metal-containing ionic liquids.
- DTA revealed transitions at ~157 °C (rearrangement) and decomposition.
- TGA showed ~72 wt% mass loss between 280-325 °C.
- TPD-MS identified four decomposition regimes and key decomposition species.
- VT-IR indicated acetate reorientation during phase transitions.
Conclusions:
- The synthesized Fe4(OAc)10[EMIM]2 compounds are metal-containing ionic liquids with unique structural features.
- They exhibit higher thermal stability than their Mn counterparts but lower than iron(II) acetate.
- The compounds possess porous structures, indicating potential applications in molecular accommodation.
- The decomposition pathway involves multiple stages and specific volatile products.
Related Concept Videos
03:34Ionic Compounds: Formulas and Nomenclature
81.1K
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.
81.1K
03:02Colors and Magnetism
12.5K
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...
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...
12.5K
03:45Formation of Complex Ions
24.3K
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...
24.3K
01:22EDTA: Chemistry and Properties
2.4K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.4K
02:54Ions as Acids and Bases
24.5K
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:
24.5K
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K