Just Ask Antoine!
Glossary: Introduction to inorganic chemistry
- ammine. Compare with amine.
- A metal ion complex containing ammonia as a ligand. The ammonia nitrogen is bound directly to a metal ion in ammines; amines differ in that the ammonia nitrogen is directly bound to a carbon atom.
- A stable complex of a metal with one or more polydentate ligands. For example, calcium complexes with EDTA to form a chelate.
- coordination number.
- The number of bonds formed by the central atom in a metal-ligand complex.
- crystal field splitting energy. ()
- Ligands complexed to a metal ion will raise the energy of some of its d orbitals and lower the energy of others. The difference in energy is called the crystal field splitting energy.
- crystal field theory. crystal field.
- The color, spectra, and magnetic properties of metal-ligand complexes can be explained by modeling the effect of ligands on metal's d orbital energies.
- EDTA. ethylenediaminetetracetic acid; versine.
- A polydentate ligand that tightly complexes certain metal ions. EDTA is used as a blood preservative by complexing free calcium ion (which promotes blood clotting). EDTA's ability to bind to lead ions makes it useful as an antidote for lead poisoning.
- high spin complex. high-spin complex.
- A metal-ligand complex with the same number of unpaired electrons as the uncomplexed metal ion. When a weak ligand complexes the metal ion, the crystal field splitting is small and the electrons can still occupy all of the d orbitals without pairing.
- inorganic chemistry.
- The study of inorganic compounds, specifically their structure, reactions, catalysis, and mechanism of action.
- inorganic compound. inorganic. Compare with organic.
- A compound that does not contain carbon chemically bound to hydrogen. Carbonates, bicarbonates, carbides, and carbon oxides are considered inorganic compounds, even though they contain carbon.
- 1. In inorganic chemistry, a molecule or ion that binds to a metal cation to form a complex. 2. In biochemistry, a molecule that binds to a receptor, having a biological effect.
- low spin complex. low-spin complex. Compare with high spin complex.
- A metal-ligand complex with fewer unpaired electrons than the uncomplexed metal ion. When a strong ligand complexes the metal ion, the crystal field splitting is large and some electrons pair rather than occupying the higher energy d orbitals.
- A ligand that has only one atom that coordinates directly to the central atom in a complex. For example, ammonia and chloride ion are monodentate ligands of copper in the complexes [Cu(NH3)6]2+ and [CuCl6]2+.
- polydentate. polydentate ligand.
- A ligand that has more than one atom that coordinates directly to the central atom in a complex. Polydentate ligands are called chelating agents when two or more coordinating atoms are attached to the same metal ion in a complex. For example, EDTA or ethylenediaminotetracetic acid is a hexadentate ligand of calcium ion.
- strong ligand. strong field ligand. Compare with weak ligand.
- A ligand that causes a large crystal field splitting which results in a low-spin complex.
- superoxide. superoxide ion.
- A binary compound containing oxygen in the -½ oxidation state. For example, KO2 is potassium superoxide, an ionic compound containing the superoxide ion, O2-.
- water gas. blue gas; synthesis gas.
- A fuel gas used in industrial synthesis of organic chemicals, and in welding, glassmaking, and other high-temperature industrial applications. Water gas made by passing steam over a bed of hot coal or coke. It consists mainly of of carbon monoxide (CO) and hydrogen (H2), contaminated with small amounts of CO2, N2, CH4, and O2.
- weak ligand. weak field ligand. Compare with strong field ligand.
- A ligand that causes a small crystal field splitting which results in a high-spin complex.