Synthesis, Crystal Structure, and Properties of Two 2D Lamella Coordination Polymers Generated from Unsymmetrically Carboxylate Bridging Ligand

<div><p>Self-assembly between simple unsymmetrical ligands, such as h<sub>2</sub>epda (5-ethyl-pyridine-2,3-dcarboxylic acid) and H<sub>2</sub>hmph(homophthalic acid) and two transition metals produce two new 2D lamella coordination polymers [Cu(hedpa)<sub>2</sub>]<sub>n</sub><b>1</b> and [Co(hmph)(bpe)]<sub>n</sub><b>2</b> (bpe = 1,2-di(4-pyridyl)ethylene), respectively. The 2D lamella structure of <b>2</b> features hmph-bridged binuclear cobalt(II) chains joined by less flexible trans-bpe ligands, whereas the 2D layer of <b>1</b> manifests that unsymmetrical ligand h<sub>2</sub>epda directly bridges mononuclear copper(II) running along the <i>bc</i> plane. The thermogravimetric (TG) reveal that both compounds are stable. Magnetic measurements show that complex <b>2</b> exhibits global metamagnetic behaviors.</p></div>