Advertisements
Advertisements
Questions
[Ti(H2O)6]3+ is coloured, while [Sc(H2O)6]3+ is colourless – explain.
Explain why [Ti(H2O)6]3+ is coloured, while [Sc(H2O)6]3+ colourless.
Advertisements
Solution
Ti in [Ti(H2O)6]3+ is in +3 oxidation state. Sc in [Sc(H2O)6]3+ is in +3 oxidation state.
The outer electronic configuration of Ti, Sc and their trivalent ions are,
Ti: 3d2 4S2
Ti3+: 3d1
SC: 3d1 4S2
SC3+: 3d0
Ti3+has one unpaired electron in 3d orbital and they undergo d-d transition. This electron can be promoted to a higher energy level by light absorption. Therefore [Ti(H2O)6]3+ is coloured.
In the case of [Sc(H2O)6]3+ there is no electron in the 3d orbital of Sc3+, hence, a d-d transition is no possibility of light absorbance. Therefore [Sc(H2O)6]3+ is colourless.
RELATED QUESTIONS
Oxidation state of Iron and the charge on the ligand NO in [Fe(H2O)5NO]SO4 are ____________.
In which of the following coordination entities the magnitude of Δ0 will be maximum?
Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds.
Based on VB theory explain why \[\ce{[Cr(NH3)6]^3+}\] is paramagnetic, while \[\ce{[Ni(CN)4]^2-}\] is diamagnetic.
Classify the following ligand based on the number of donor atoms.
NH3
Classify the following ligand based on the number of donor atoms.
en
Classify the following ligand based on the number of donor atoms.
ox2−
Classify the following ligand based on the number of donor atoms.
pyridine
What is the coordination entity formed when excess of liquid ammonia is added to an aqueous solution of copper sulphate?
On the basis of VB theory explain the nature of bonding in \[\ce{[Co(C2O4)3]^3-}\].
