Table 5.2 Properties of six different caging groups.

Caging Group Uncaging Rate * Photolysis Quantum Yield * Inertness of Photolysis By-product Confers Water Solubility Long-Wavelength Absorption
(≥360 nm)
CNB ++++ +++++ +++++ +++++ ++
NPE +++ +++ +++ + ++
DMNPE +++ +++ +++ + +++++
DMNB +++ +++ ++ + +++++
CMNB +++ +++ + ++++ +++
NP +++ +++ + + ++
+++++ = Optimal response. + = Poor response. * Both the structure of the nitrobenzyl moiety and the atom to which it is attached have some effect on the efficiency and wavelength required for uncaging.