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Question 43648

posted 11 months ago

Consider the Frost diagram of some actinoids (An) in aqueous solution shown below:
Answer the following questions and fully explain your reasoning in each case.
Why does Bk show only 2 oxidation states while Am, Pu, U show 4 different oxidation states?
Why is the oxidation state +4 particularly stable for the element Th?[6]
The oxocations AnO2* and AnO2²* (An = U, Pu, Am) have been isolated and studied. However, the oxocations LnO2+ and LnO2²+(Ln = Nd, Sm, Eu) areunknown. How can these observations be explained?
Would you expect the following molecules to be observed? Explain your answer.
CIF7
ArF4
Fully explain the origin of the difference in overall stability constants, measured in aqueous solution, for the two copper complexes in the table below.

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Question 43679

posted 11 months ago

The observed rate constant kobs for ligand substitution reactions at square planar platinum(II) complexes is a combination of the rate constants from competing pathways with (kı) and without (k2) solvent participation. The rate constant (k2) for the substitution of a chloride in trans-[Pt(py)2C12] by different ligands (Y) in methanol solvent at 30 °C and the nucleophilicity parameter (npi) of these ligands is given below:(c)
when Y = MeOH=solvent; the rate of reaction is 0.00027 s-'.
Use this data to calculate the nucleophilic discrimination factor (s) for the complex [Pt(py)2C12]. Show all of your working. (py = pyridine)
In methanol solvent at 30 °C the nucleophilic discrimination factor (s) for[Pt(dien)(OH2)]* = 0.44. Using your value of s from part (i) would you expect [Pt(dien)(OH2)]2* to be generally more or less reactive towards ligand substitution? Explain your answer.dien=diethylenetriamine H2N(CH2)2NH(CH2)2NH2)

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Question 43792

posted 11 months ago

1. For the following questions you may need to look-up character tables online.
An object has a four-fold principle rotation axis. For the irreducible representationcontaining (x,y) in its linear functions column, use matrices to determine thecharacters in the columns headed by E, C4 and the next listed rotation operation.Also show how matrices can be used to determine the number in front of each ofthe operations i.e. the number of unique operations. Fully explain your reasoning.
For the Dsh character table explain the logic used to assign Mulliken symbols to the irreducible representations. You should ignore the subscripts 1 and 2 for the representations but explain all other parts of each Mulliken symbol.
Explain the relationship between the symmetry element i, the characters in the column headed by i in character tables and the subscripts g or u that are used in crystal field and molecular orbital energy level diagrams.

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Question 38446

posted 1 years ago

What is the ground state(A or E) for Octahedral d7,d8 and d9 ?:For an A ground state, a= 4. and for an E ground state, a= 2 Also Is it high or low spin? Give two examples for each of them (d7,d8and d9) and Calculate ueff ( like the example in the attachment)for each?
\mu \mathrm{eff}=\mu(\text { spin-only })(1-\alpha \lambda / \Delta o c t)

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Question 34250

posted 1 years ago

2. Discuss the Laporte and Spin selection rules, and ways in which they can be lifted for octahedral and tetrahedral complexes.

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Question 34251

posted 1 years ago

3. Derive ground state terms for d- to do ions in the absence of a lig and field. Explain what happens to the energy of the free ion terms in a tetrahedral field.

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Question 34252

posted 1 years ago

4. What is the nature of the electron transition causing light absorption for intensely coloredMnO4 (purple-red), MnO42 (green), and CrO42 (yellow) ions?

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Question 34256

posted 1 years ago

8. Calculate the energy level value of 4F72 deduced from d7
where (E=0.5*A[(J;(J;+1)-L(L+1)-S(S+1)|)

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Question 34253

posted 1 years ago

5. In the octahedral d complex, VCI3, the two lowest energy transitions occur at 6600 and13300 cm1. Use a Tanabe-Sugano diagram to calculate the values of the crystal field splitting and Racah parameters and work out the frequency of the higher energy transition.

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Question 34254

posted 1 years ago

6. Determine the possible values of (J) representing the effect of spin orbit coupling on the energy level 4D of d5

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