Why Is Br A Weaker Field Ligand Than Co?

Br- has a weaker field ligand than CO because CO has pi- bonds and these bonds are available for donating pi-electrons to metal-ion or atom. While Br- has less pairs of electrons for donation making CO stronger than Br-. Br- has a weaker field ligand than CO because CO has pi- bonds and these bonds are available for donating pi-electrons to metal-ion or atom. While Br- has less pairs of electrons for donation making CO stronger than Br-.

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