Abstract
The photochemistry of NCS- was investigated at wavelengths within its charge-transfer-to-solvent (CTTS) absorption band. Only a small yield of solvated electrons was detected; most of the excited ions dissociate to give CN- (or HCN) + S pairs, which undergo efficient cage recombination. The increase of the quantum yield with NCS- concentration is ascribed to self-scavenging: NCS- scavenges the sulfur atom from the cage. This mechanism is verified by the use of allyl alcohol as a foreign scavenger for S atoms. The photolysis is strongly affected by varying the acidity around pH 7.5. This is attributed to acid-base equilibrium involving the excited ion.
Original language | English |
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Pages (from-to) | 305-308 |
Number of pages | 4 |
Journal | Journal of Physical Chemistry |
Volume | 72 |
Issue number | 1 |
DOIs | |
State | Published - 1968 |