DM.6 Flashcards
Structure and properties of complexes
What does a complex consist of?
A central metal ions and ligands surrounding it.
What is it called when a complex is charged?
A complex ion.
What is the coordinate number of a complex?
The number of coordinate/dative bonds from the central ions to the ligands.
What are the two most common coordinate numbers?
4 and 6.
Complex with the coordinate number six normally have what shape?
Octahedral.
What are the two common shapes complexes take when they have a coordinate number of four?
Tetrahedral or square planar.
Complex with the coordinate number two normally have what shape.
Linear.
Can complexes have irregular shapes that don’t fit with the categories?
Yes, this may be due to stronger and therefore shorter bonds for some ligands.
What is the ring formed when the metal ion is attached to a bidentate ligand known as?
Chelate ring.
What kind of ligand is EDTA4-?
Hexadentate ligand, meaning it forms 6 dative bonds.
What is the reaction known as when one ligand displaces another from a complex?
Ligand exchange or substitution.
Why does ligand substitution occur?
It occurs because the new complex formed is more stable than the previous complex.
What is the reaction known as when a water ligand turns into a hydroxide ligand?
Deprotonation reaction.
What happens in the reaction where a water ligand turns into a hydroxide ligand in alkaline conditions?
A hydrogen from the water ligand leaves to join when OH- ions in the solution, it is not a substitution reaction.
