Rational Synthesis of Noncentrosymmetric Metal-Organic Frameworks for Second-Order Nonlinear Optics

Rational synthesis of noncentrosymmetric Metal-Organic Frameworks (MOF) for second-order nonlinear optics is discussed. Lin et al. demonstrated the ability to crystal engineer noncentrosymmetric MOFs of the diamondoid topology by tuning the length of p-pyridinecarboxylate linkers. Xiong et al. extended the in-situ ligand synthesis strategy first developed in the Lin group to prepare Zn-tetrazole MOFs by reacting nitriles, sodium azide, and Zn 2+ salts under hydro (solvo)thermal conditions. Lin et al. synthesized a noncentrosymmetric 1-D coordination polymer using 3-(4-(2-(pyridine-4-yl)vinyl) phenyl)-acrylate and Zn 2+ nodes. Xiong et al. constructed noncentrosymmetric 3-D framework from zigzag chains or strips using a pyridinetetrazole ligand and Cd 2+/Zn 2+ ions. Xiong et al. also used racemic 3-amino-3-(pyridine-3-yl)propanoate (app) and Zn 2+ ions to construct a SHG-active MOF by taking advantage of the self-resolution process.