Answer:
Solution
verified
Verified by Toppr
Coordination entity:
A central metal atom/ion bonded to fixed number of oppositely charged ions or neutral molecules. Examples include [Ni(CO)
4
],[CoCl
3
(NH
3
)
3
].
Ligand:
An atom or molecule or ion capable of donating a pair of electrons to the central metal or ion and forms a coordinate bond with it. Examples include chloride ions, water and ammonia.
Coordination number:
The total number of ligands in a coordination compound attached to the central metal atom or ion. For example, in [Ni(CO)
4
], the coordination number of Ni is 4. In CoCl
3
(NH
3
)
3
, the coordination number of Co
3+
is 6.
Coordination polyhedron:
The spatial arrangement of ligand atoms which are directly attached to the central atom. For example, [Co(NH
3
)
6
]
3+
has octahedral geometry and Ni(CO)
4
has tetrahedral geometry.
homoleptic :
Metal is bound to only one kind of donor groups. For example [Ni(NH
3
)
6
]
2+
,[Co(NH
3
)
6
]
3+
.
heteroleptic :
Metal is bound to more than one kind of donor groups. For example [CoCl
3
(NH
3
)
3
],[NiCl
2
(H
2
O)
4
].
