Photochemistry

Question 1

Photosensitisation

Answer 1

energy transfer process

Question 2

quantum yield

Answer 2

number of times a specific event occur per photon absorbed by the system

Question 3

why is quantum yield of fluorescence important

Answer 3

competes with ISC which is needed to TTA

Question 4

first law of photochemistry

Answer 4

only light absorbed by a molecule is effective in producing a photochemical change in the molecule

Question 5

2nd law of photochemistry

Answer 5

for each photon of light absorbed by a system only one molecule is activated for a photochemical reaction

Question 6

direct photochemistry

Answer 6

direct excitation of substrates/reaction intermediates

Question 7

photocatalyst

Answer 7

absorbs light and then activates non-absorbing species, recovered unchanged at end

Question 8

modes of interaction

Answer 8

e- transfer = photoexcited state acts as single e- oxidant/reductant
energy transfer = physical energy transfer from photoexcited species to acceptor
atom transfer = photoexcited species abstracts atom from donor