Three 2D/2D → 2D or 3D Coordination Polymers: Parallel Stacked, Interpenetration, and Polycatenated

Three fascinating coordination polymers, {[Zn₂(TPPBDA)­(HCO₂^–)₄]·2H₂O}_<i>n</i> (<b>1</b>), {[Zn­(TPPBDA)_1/2(4,4′-sdb)]·2H₂O }_<i>n</i> (<b>2</b>), and {[Zn­(TPPBDA)_1/2(oba)·2DMF·2H₂O]}_<i>n</i> (<b>3</b>), have been successfully synthesized and characterized by the self-assembly of the TPPDBA ligand as well as Zn²⁺ metal salts, or in the presence of carboxylate ligands (TPPDBA = <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetrakis­(4-(4-pyridine)-phenyl) biphenyl-4,4′-diamine), 4,4′-H₂sdb = 4,4′-sulfonyldibenzoate, 4,4′-H₂oba = 4,4′-oxybis­(benzoate), DMF = <i>N</i>,<i>N</i>-dimethylformamide). In complex <b>1</b>, the 2D ABAB parallel stacked network in which left- and right-handed helical chains coexist and array alternately (2D_chiral/2D_chiral → 2D_achiral) makes <b>1</b> give rise to a new interesting 2D interwoven network. Complex <b>2</b> exhibits a 2D + 2D → 2D parallel interpenetrated network. For compound <b>3</b>, the polycatenation among the 2D layer further extends the 2D net into a 3D framework