Organic chemistry Lab - Oxidation of Luminol: Need answers for questions 1-6. ue

Question

Organic chemistry Lab - Oxidation of Luminol: Need answers for questions 1-6. uestions l. Why does a compound in the excited triplet state undergo intersystem crossing before returning to the ground state? 2. Describe the difference between fluorescence and phosphorescence. 3. Why does the formation of the diimide require temperatures in excess of 200 oC? 4. Identify the oxidation number of chromium in each of the following chemical species. (a) Cr207 (d) Cr2S3 (b) Cr2O3 (c) CrSO4 5. In each of the following reactions, identify the oxidizing and reducing agents. (a) CoHBO6 2 H 2 NO2 C6H6O6 2H20 2 NO (b) 2 KMno. 16 HCI 2 MnCl 5 Cl 8 H20 2 KCI 6. Balance each of the following redox reactions using the halfreaction method. Show your work. Cr (acidic medium) (a) l Cro. COH (b) Mno. C204 Mno2 CO3 (basic medium)

Explanation / Answer

1.A) Intersystem crossing means the deactivation of excited strange by changing electronic level by loosing energy in the form of heat.

The electron with a singlet ground state is excited to higher energy level either singlet excited state or an triplet state. The excited state is no longer paired with ground state electron they are in same spin.

The states S1 --------> T1 and T1----> S0 is forbidden.

So the compound undergoes Intersystem crossing triplet state (T1)are before returning to the ground state.

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