Question

Which is not true for Type II photosensitization pathway?

Select one:

a. requires a donor molecule

b. involves transfer of excited spin-state energy from sensitizer to another molecule

c. does not need initial excitation of the photosensitizing molecule

d. requires a long-lived triplet excited state

Answer 1

%%%%%Answer and Explanation%%%%%

"Photosensitization is a light absorbing molecules, that is a reaction to light, it can involve reactions within cells or tissues"

Answers-

Option A is CORRECT option

Explanation- Yes , In type II photosensitization requires a donor (i.e. Photosensitizer- Energy donor molecules that lead to the chemical change in the photochemical processes) .

Option B is CORRECT option

Explanation- Yes , there is an acceptor of spin state of energy from the sensitizer to oxygen molecules, and it produces an excited singlet state of oxygen, state known as singlet oxygen.

Option C is INCORRECT option

Explanation- NO, because the donor molecules known as photosensitizing molecules NEED LIGHT then they are converted to a singlet state with a greater energy content,

Option D is CORRECT option

Explanation- Yes , The excited triplet state has a longer life time than an excited singlet state, since transition can be forbidden between triplet and singlet energy states.

Thanks