Stability Constants and Stabilization of TM Complexes

The degree of ________ between the metal ion and the ligand directly influences the stability of the complex in solution.

• association

• dissociation
• ionisation

• reaction

Which of the following factors does NOT significantly affect the stability of a transition metal complex?The charge of the metal ion

• The charge of the metal ion

• The size of the metal ion

• The oxidation state of the metal

• The number of protons in the metal nucleus

What does a large stability constant (K) for a complex indicate?

• The complex is highly unstable

• The complex is in equilibrium with its dissociated ions

• The ligand binds strongly to the metal ion

• The complex is likely to be colorless

Which of the following statements about the stepwise stability constants (K1, K2, etc.) is generally true? 

• K1 is always equal to K2

• K1 > K2 > K3..

• K1 < K2 < K3...

• The values of K1, K2, etc., are independent of each other

How are the stepwise stability constants (K) related to the overall stability constant (β)?

• β_n = K₁ + K₂ + …. + K_n

• β_n = 1/(K₁ + K₂ + …. + K_n)

• β_n = logK₁ + logK₂ + …. + logK_n

• β_n = K₁ x K₂ x … x K_n

Given the values of stepwise stability constants for a series of successive reactions are logK₁ = 4, logK₂ = 3.2, logK₃ = 2.7 and logK₄= 2, what is the value of β₄?

• 7.94 x 10¹¹

• 1.47 x 10⁵

• 11.9

• 27.4

Two complexes A and B have dissociation constants 1.0 x 10^-12 and 4.7 x 10^-14 respectively. Which complex will be more stable?

• A

• B

• Both are equally stable

• Cannot be determined

Name the process involved in the formation of metal-ligand complexes.

• Synthesis
• Redox

• Ligand substitution

• electron transfer