Structure and bonding of Metalic carbonyls

we will here study the structure and bonding of ...:

i) Mononuclear carbonyls:-

The structure of mononuclear metalic carbonyls have been studied by x-ray difraction, IR spectroscopy and electron difraction. All the mononuclear carbonyls have linear metal-carbonyl bond in which metal atom is linked to carbonyl molecule through the carbon atom since oxygen atom is more electronegative than carbon atom.

Sapes of metal carbonyls:-

i) Hexacarbonyls:-

                           The carbonyls having six carbonyl molecules attached to metal atom are called hexacarbonyls.

                           Shape = Octahedral

                           Hybridization = d2sp3

                          Co-ordination number = 6

Examples:-

               V ( CO)6, Cr(CO)6, W(CO)6

ii) Pentacarbonyls:-

                              Such carbonyls ehich contain five carbonyl molecules attached to the metal atom are called pentacarbonyls.

                         Shape = Trigonal bipyramidal

                         Hybridization = dSp3

                         Co-ordination number = 5

Examples:-

               Fe(CO)5, Ru(CO)5, Os(CO)5

iii) Tetracarbonyls:-

                               The carbonyls which contain four carbonyl molecules attached o the metal atom are called tetracarbonyls.

                           Shape = tetrahedral / Square planner

                   Hybridization= Sp3         / dSp2

                     Co-ordination number = 4

Example:-

                Ni(CO)4