42-dt-content-rid-17108994-1/courses 21 79-19936 PS3-DueNov 16th%2829629 pdf .Ma

Question

42-dt-content-rid-17108994-1/courses 21 79-19936 PS3-DueNov 16th%2829629 pdf .Making Predictions about reactivity and Address the following using the example provided. This example will be provided on Exam 2 NOTE: on the final, you will not be given the example below, but the equations will be provided 4 -1371-0086 +0+0914.-0457A, UAE·LFBEt.usE+4457.-04+0057, i. Predict whether the molecule is inert or labile. (non-programmable calculator allowed) [Fe(CN [Fe(CNA. d, e, low spin d' ii. the hexamine complex [Cun(NHjr"does not exist on any appreciable time scale,what is the Answer in once sentence or less. (Hint: the tetraamine [Cu (NH" is stable) ii. Describe the phenomenon behind each observation; answer in once sentence or less. a. [Mn(Olbkis essentially colorless why is this? b. Besides manganese, most molecules in section () are colored, but only faintly. Why is this? c. [CuONH).is actually quite dark in comparison, why is this? d. The [Fe'(bipyh and el(bipyh] complexes are even darker than all the above complexes What kind of transition is responsible? ALIENWARE

Explanation / Answer

If the complex contains empty t2g orbital, then it will be labile because ligands can approach easily without much repulsion. In short, if the complex contains less than three d-electrons, it will be labile. Or, if one or more eg electrons are present, it will be labile.

Compound

No.of d electrons

Nature

V[H2O]6

d3: t2g3, eg0

Inert

Cr[(NH)3]3+

d3: t2g3, eg0

Inert

Mn[(H2O)6]2+

d5(high spin): t2g3, eg2

Labile

Fe[(CN)6]3-

d5(low spin): t2g5, eg0

Inert

Fe[(CN)6]4-

d4(low spin): t2g5, eg0

Inert

FeII[(bipy)32+ low spin d6

d6(low spin): t2g6, eg0

Inert

FeII[(bipy)33+ low spin d5

d5(low spin): t2g5, eg0

Inert

Compound

No.of d electrons

Nature

V[H2O]6

d3: t2g3, eg0

Inert

Cr[(NH)3]3+

d3: t2g3, eg0

Inert

Mn[(H2O)6]2+

d5(high spin): t2g3, eg2

Labile

Fe[(CN)6]3-

d5(low spin): t2g5, eg0

Inert

Fe[(CN)6]4-

d4(low spin): t2g5, eg0

Inert

FeII[(bipy)32+ low spin d6

d6(low spin): t2g6, eg0

Inert

FeII[(bipy)33+ low spin d5

d5(low spin): t2g5, eg0

Inert

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