點知邊個ligand可以displace另一個ligand

It is mainly depends on Ligand stregth of the ligand

Ligand strenght depends on (a)basic strength and (b) no of atoms which have lone pair that can donate

Usually basic strenght increase imply Ligand strenght increase

Usually no of atoms which have lone pair that can donate increase imply Ligand strenght increase

because of the change in entropy

eg ECTA>>N2O, (C2O4)^2-

Minor factor such as pH (low pH may lead the protonation of the Donor atoms)

2008-04-26 16:58:57 補充：
series : CO> CN->NO2>EDTA4->HN2-CH2-CH2-NH2>NH3> NCS-> H2O>(C2O4)2->F->OH->Cl->br->I-

the power of being a ligand is different.
and it has to be remembered.
just like metal reactivity series.K>Na>Ca>Mg>Al
it has to be remembered too. right?