Question

if ethyl groups are added to a benzene ring of a siderophore, why would it incresse the stability constant of the complex?

Answer 1

Stability constant means measure of strength of the interaction between the ligand and metal ion which come together to form complex , any factor which enhances this rate will tend to increase the value of stability constant. Here in case of sidophore ( sidophores are the cheating compounds having benzene ring ) if ethyl group is added to the benzene ring electron density will increase on the ring and electron donating capacity will increase so these sidophores will bind faster to the binding agents consequently stability const will increase.