Could someone help me out with some of these questions for inorganic chemistry o
ID: 806927 • Letter: C
Question
Could someone help me out with some of these questions for inorganic chemistry on Polyoxometalates and Electron Transfer.
1) What is the oxidation state of P, Mo, and O in the POM?
2) What information can be obtained from the IR analysis?
3) What information can be obtained from Uv-vis analysis?
4) What does color arise from in this compound?
5) In what way might the color be changed (oxidation or reduction)?
6) What, chemically, could you do to change the structure?
7) How many electrons can be added to this structure?
8) What effect does the addition of electrons have upon molecular structures/bond lengths?
9) How might you be able to tell if you have maxed out for this reducing agent?
How might you add more? Could you add more?
10)How might you be able to determine how much the structure of the POM is affected by the electron transfer?
Any help would be much appreciated!!! :)
Explanation / Answer
(i) Mo is in +6 state, P in +5 state, O in -2
(ii) IR can give information about Mo-O bond also about presence of terminal or bridged phosphate group and oveall structure of POMp.
(iii) UV-vis spectra can give information about the oxidation state of the metal ion (from d-d transition ) and monolayer film
(iv) color arises due to ligand (O2-) to Mo charge transfer.
(v) The metal can be reduced. In that case the energy required for charge transfer will change and the color will change accordingly.
(vi) POM can be dissolved in water. By changing the pH of the medium the structure can be changed.
(vii) the number of electron that could be added depends on number of metal ions present. each Mo can be reduced upto the state of +3.
(viii) upon addition of electron the bond lengths increases
(ix) we can reduce the POM more without affecting the structure.
(x) by doing a cyclic Voltametry experiment we can predict how much the structure has changed