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Flashcards in Photochemistry Deck (24)
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1

Prompt Photodissociation

one molecule excited for each photon absorbed
so fast there is no clear excited state

2

Wavelength Dependence

change wavelength of irradiation change photochemistry

3

Delayed Photoreaction

electron excited into excited state
converted to a second excited state
then reacts

4

Typed of Excited State

metal centred
intraligand
ligand-metal charge transfer: need lone pair
metal-ligand charge transfer: need d electrons
metal-metal charge transfer
metal-metal bonding

5

Franck-Condon

absorption from one low level to many upper levels
emission from one upper level to many lower levels
0->0 same peak
mirror image spectra

6

Photoluminescence

light shon on a sample

7

Fluorescence

luminescence, no change in spin state

8

Phosphorescence

luminescence, change in spin state

9

Electroluminescence

apply potential within
out comes light

10

Absorption

scan wavelengths of light coming in
absorbance vs. yex

11

Emission

measure intensity of emission
Iem as function of yem
yex constant

12

Excitation

Iem as function of yex
yem constant

13

Selection Rules

spin
gu
asymmetric d->d

14

MLCT

absorption from ground state to 1(MLCT) state
emission from 3(MLCT) to ground state

15

Electron Transfer Redox

-ve potential, reducing
+ve potential, oxidising

16

Long Distance Electron Transfer

attach Ru(bpy)22+ to protein surface via histidine
repeat with different histidines at known distances from haem

17

DNA Probe

Ru(phen)2(dppz)2+ emits in presence of DNA
intercalates in chain

18

Solar Battery

electricity using light
TiO2 nanoparticle
electrons into conduction band

19

Light Emitting Diode

cathode provides electron
anode supplies hole

20

Organic Light Emitting Diode

charge injection
charge transport
exciton formation
emission

21

Full/Empty Orbital

(t2g)0 or (t2g)6
1A1g

22

1 Electron or 1 Hole

(t2g)1 or (t2g)5
2T2g

23

2 Electrons or 2 Holes

(t2g)1(eg)1 = T1g + T2g
singlets and triplets of each

24

Gas Phase

one photon absorbed can cause loss of several ligands
excess energy remains and causes sequential losses