1- i think in mn 3 plus only1 d is vecant hybridisation is dsp3
2-justify this vbt doesnt make exact prediction regarding the tetrahedral and square planer str of 4- coordinated complex
3- justify and explain d orbitals splitting is inverted and is smaller as compare to octahedral field splitting
4- how dd transition helps in deciding the colour of complex
5- explain instability constant and compile complex
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2. According to valence bond theory, square planar complexes are formed only in case of central metal ion with configuration of (n-1)d8 or (n-1)d9.But this generalisation is not always true as for example the the complex [NiCl4]2- with d8 configuration is tetrahedral and not square planar.
So, it can be said that vbt doesnt make exact prediction regarding the tetrahedral and square planer structure of 4-coordinated complex.
4. d-d transition refers to the transition of electron/s from a lower energy t2g level to the higher energy eg level on absorption of light.When an electron in t2g d orbital absorbs light it gets excited and makes a transition to eg d orbital.If the light absorbed is in visible region, the transition complex appears coloured.Therefore, d-d transition helps in deciding the colour of complex.For example: in the complex [Ti(H2O)6]3+, Ti3+ ion has 3d1 configuration.The only electron in d orbital occupies t2g level in ground state.If this electron absorbs light in blue-green region, it gets excited to eg level and appears violet in colour.
2. According to valence bond theory, square planar complexes are formed only in case of central metal ion with configuration of (n-1)d8 or (n-1)d9.But this generalisation is not always true as for example the the complex [NiCl4]2- with d8 configuration is tetrahedral and not square planar.
So, it can be said that vbt doesnt make exact prediction regarding the tetrahedral and square planer structure of 4-coordinated complex.
4. d-d transition refers to the transition of electron/s from a lower energy t2g level to the higher energy eg level on absorption of light.When an electron in t2g d orbital absorbs light it gets excited and makes a transition to eg d orbital.If the light absorbed is in visible region, the transition complex appears coloured.Therefore, d-d transition helps in deciding the colour of complex.For example: in the complex [Ti(H2O)6]3+, Ti3+ ion has 3d1 configuration.The only electron in d orbital occupies t2g level in ground state.If this electron absorbs light in blue-green region, it gets excited to eg level and appears violet in colour.