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In recent years there has been significant interest in the ability to switch the second-order nonlinear optical (NLO) response at the molecular level. A compound can be considered as an NLO switch when the response can be turned to an 'on 'and 'off' state. Several switching schemes at the molecular level have been envisioned. Earlier schemes used isomerisation and tautomerisation, causing changes in the nature and/or degree of conjugation between electron donor and acceptor. An alternative approach is based on lowering the electron donating capacity of the electron donor or the withdrawing capacity of the acceptor group. Here we will present results based on protonation/deprotonation and oxidation/reduction of the donor group.