A Square Grid Coordination Polymer from Tetrahedral Metal Ions and Angular Dicarboxylate Ligands

The title compound, {[NH2(CH3)(2)](4)[Zn(C8H4O5)(2)](SO4)}(n), is a coordination polymer based on mononuclear Zn(O2C)(4) unit and 5-hydroxyisophthalate linker. The 120A degrees arrangement of the two carboxyl groups of the ligand effectively cancels out the tetrahedral coordination angles around Zn2+ ion and results in a two-dimensional (2D) square grid network. The surplus cations and anions balancing the extra charges of the framework form hydrogen bonds with carboxyl and hydroxyl groups of adjacent 2D layers. As a result, straight open channels are formed along a direction perpendicular to the 2D layers.This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0087194)