Nomenclature Of Coordination Compounds
Chapter Name : Coordination Compounds |
Sub Topic Code : 102_12_09_03_01 |
Topic Name : Nomenclature Of Coordination Compounds |
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Sub Topic Name : Formulas Of Mononuclear Coordination Entities |
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Introduction
Coordination compounds are molecules that poses a metal center that is bound to ligands (atoms, ions, or molecules that donate electrons to the metal). These complexes can be neutral or charged. When the complex is charged, it is stabilized by neighboring counter-ions.
Pre-Requisites:
Nomenclature Of Coordination Compounds
Activity:
Water.
Real Life Question:
What are Coordination compounds?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Coordination compounds | Coordination complexes have their own classes of isomers, different magnetic properties and colors, and various applications (photography, cancer treatment, etc.), so it makes sense that they would have a naming system as well. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Lewis base theory | The Lewis Acid and Base theory is another way of explaining reactions between H+ and OH- ions. |
Real life uses :
To begin naming coordination complexes, here are some things to keep in mind. Ligands are named first in alphabetical order. The name of the metal comes next. The oxidation state of the metal follows, noted by a Roman numeral in parentheses (II, IV).
Places to visit :
Chemistry laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Amminetetraaquachromium(II) ion | Amminetetraaquachromium (II) ion would be written as [Cr (H2O)4(NH3)]+2. Both ligands are neutral, so they are ordered alphabetically with H2O before NH3. |
What you learn in Theory:
The formula of a coordination complex is written in a different order than its name. The chemical symbol of the metal center is written first. The ligands are written next, with anion ligands coming before neutral ligands. If there is more than one anion or neutral ligand, they are written in alphabetical order according to the first letter in their chemical formula.
What you learn in Practice:
In a coordination compound's name, when one of the ions is just an element, the number of atoms is not indicated with a prefix. Since it still has to be written in the formula, it is determined by balancing the overall charge of the compound.