Using simple monodentate Lewis basic ligands of your choice (e.g. halides, carbo

Question

Using simple monodentate Lewis basic ligands of your choice (e.g. halides, carbonyls, aqua, ammine, etc.) and transition metals of your choice, sketch 3 different complexes that each have an electron count of 18. At least one of the complexes should be 5 coordinate, each complex should have a different metal, each complex should have a different metal oxidation state, and each complex should have two or more different ligands. Give the metal oxidation state and d electron count for each complex.

Explanation / Answer

1.K4[ Fe F4 (Cl)2 ]

here two simple ligands are F- and Cl- . this complex coordination number 6. and it follows 18 electrons rule

18 e- = 6 ( d6 from Fe+2 ) + 6x2 (from ligand 6)= 18 total electrons

here metal oxidation state(Fe) +2. and two different ligands are taken

EAN= 26-2 + (2X6)= 36 (Kr)

it follows EAN rule also

2.[ Co (NH3)4 (H2O)2 ]Cl3

here Co oxidation state +3

two different ligands NH3 and H2O

total electrons= 6 ( d6 from Co+3 ) + 6x2 (from ligand 6)= 18

it follows 18 electron rule also

EAN= 36(Kr)

3. [ Cr (CO)5(NO)]

here Cr oxidation state =0

two neutral ligand = CO , NO

total electrons= 6 ( d6 from Cr(0)) + 6x2 (from ligand 6)= 18

EAN= 24+ 12=36(Kr)

MORE EXAMPLES

These complexes follow 18 electron count. These are you can use .

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