Abstract
In this chapter, we highlight recent advances and perspectives in the design and synthesis of NLO-active metal–organic frameworks (MOFs). Some of these compounds show impressive second harmonic generation (SHG) responses and may have potential use in NLO-applications. Noncentrosymmetric MOFs can be synthesized mainly by using chiral ligands, unsymmetrical achiral ligands, and mixed metal ions. Organic ligands containing donor-π-acceptor systems can be incorporated into MOFs to improve the SHG activity of the bulk materials through push–pull effect. Some diamondoid or octupolar MOFs have been shown to exhibit excellent SHG properties. Besides, a number of MOFs with 2D grid-type or 1D helical chain structures display good SHG activity.
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