New Metal−Organic Framework with Uninodal 4-Connected Topology Displaying Interpenetration, Self-Catenation, and Second-Order Nonlinear Optical Response

An interesting coordination complex based on a designed X ligand has been prepared. It displays a novel 4-connected uninodal net with point symbol (4 2 ·6 3 ·8) and vertex symbol [4.6.4.6.6.10 12 ] which has never been observed in metal−organic frameworks/coordination polymers. Meanwhile, the compound displays intriguing structural features of interpenetration and self-catenation, as well as nonlinear optical properties.