We were inspired by Dr Matthew Stoltzfus’s approach in flipped classrooms, here at KFUPM we adapted similar approach. Dr. Fus thankfully agreed to share his video lectures with us.
The following videos are organised by sections of “Chemistry, by Julia Burdge”

22.1 Coordination compounds – Part 1

Being able to properly interpret the properties of the electromagnetic spectrum will allow us to interpret how our eyes detect color.

22.1 Coordination compounds – Part 2

The discreet nature of the energy levels in molecules allows us to determine the energy it would take to excite an electron from an energy level of lower energy to one of higher energy. If this excitation falls in the visible range of the electromagnetic spectrum, our eye will detect color.

22.1 Coordination compounds – Part 3

Chemists are able to measure the wavelength of light a material absorbs using a UV-Vis Spectrometer, and by measuring which wavelengths of radiation are absorbed and which are not, we can gain valuable information on a molecules electronic excitations, or electronic structure.

22.1 Coordination compounds – Part 4

22.1 Coordination compounds – Part 5

Keep in mind that a transition metal atom has very different properties than when it is the central atom in a coordination complex. This is due to the difference in how the electrons fill the orbitals to achieve the lowest energy configuration possible.

22.1 Coordination compounds – Part 6

Coordination Compounds consist of a transition metal complex ion (transition metal center with ligands attached) and counter ions. The relative energies of the d orbitals in these transition metal complexes lead to some unique physical properties, including color and magnetism.

23.3 Ligands

We have discussed that transition metal complexes exhibit a wide variety of colors and have varying magnetic properties. In order to explain the similarities and differences in these properties we need to look into the bonding theories of transition metal complexes.

22.2 Structure of Coordination Compounds – Part 1

In 1893 Alfred Werner proposed a theory that successfully explaining the difference in color for various transition metal complexes. This theory is still used today, but before we go into the modern day theory, lets take a look into how Werner developed his theory.

22.2 Structure of Coordination Compounds – Part 2

22.2 Structure of Coordination Compounds – Part 3

Once the modern day formulas were introduced, chemists began to investigate how ligands surrounded the transition metal center. The term isomer is given to complexes that have the same overall composition, but different structures. This prompted chemists to introduce two new terms: coordination sphere and coordination number.

22.2 Structure of Coordination Compounds – Part 4

Once Werner showed coordination complexes could exist as isomers, chemists began to investigate various isomers and in this class we will cover two types of structural isomers (linkage and coordination sphere) and two types of stereo isomers (geometric and optical).

22.2 Structure of Coordination Compounds – Part 5

22.2 Structure of Coordination Compounds – Part 6

22.2 Structure of Coordination Compounds – Part 7

22.2 Structure of Coordination Compounds – Part 8

22.2 Structure of Coordination Compounds – Part 9

22.2 Structure of Coordination Compounds – Part 10

When you are given a transition metal complex you will need to know how to determine its oxidation state, its coordination number, and its geometry.

22.2 Structure of Coordination Compounds – Part 11

When a transition metal complex has a coordination number of 4 it can exist as either a tetrahedral or square planar molecule. There are a set of empirical observations that can allow you to predict whether a complex with a coordination number of 4 will exist as a tetrahedral molecule or a square planar molecule.

22.2 Structure of Coordination Compounds – Part 12

22.2 Structure of Coordination Compounds  – Part 13

22.2 Structure of Coordination Compounds – Part 14

Transition metal complexes bond to a variety of surrounding atoms/molecules which we refer to as ligands. The nature of the ligand that binds to the transition metal center has a large influence on the properties of the transition metal complex.

 

22.3 Bonding in Coordination Compounds – Part 1

22.3 Bonding in Coordination Compounds – Part 2

In order to understand the bonding theories of transition metal complexes you need to visualize how the ligands interact with the 5 different d orbitals. You cannot visualize how the d orbitals interact with the ligands if you do not know the shapes of the d orbitals like the back of your hand.

22.3 Bonding in Coordination Compounds – Part 3

By observing the colors of various transition metal complexes, we can start to see how the nature of the ligand bound to the transition metal center plays a big role in determining the resulting color of a transition metal complex.

22.3 Bonding in Coordination Compounds – Part 4

22.3 Bonding in Coordination Compounds – Part 5

22.3 Bonding in Coordination Compounds – Part 6

22.3 Bonding in Coordination Compounds – Part 7

22.3 Bonding in Coordination Compounds – Part 8

22.3 Bonding in Coordination Compounds – Part 9

22.3 Bonding in Coordination Compounds – Part 10