The diversity of five metal–organic complexes based on an unsymmetrical biphenyl tetracarboxylate: Synthesis, structures, magnetism and luminescence

A Multistimuli Responsive Crystalline Cd(II)-Viologen Coordination Polymer with Single-Crystal–Single-Crystal Transformation

“…In addition, there were no bands in the region of 1720–1680 cm –1 of 1 , indicating the complete deprotonation of the carboxylic groups. Complex 1Z shows one intense band at 1720 cm –1 , indicating that the carboxyl group is not completely deprotonated …”

“…Complex 1Z shows one intense band at 1720 cm −1 , indicating that the carboxyl group is not completely deprotonated. 36 Structure analysis reveals that 1 crystallizes in the monoclinic system with the space group C2/c (Table S1). As shown in Figure 1a, the asymmetric unit of 1 includes one metal Cd(II) ion, one cbbpy ligand, two coordinated Cl − ions, and 3.…”

Novel 2D isomorphic lanthanide complexes based on a bifunctional 5-(pyridin-3-yloxy)isophthalic acid: synthesis, structure, fluorescence and magnetic properties

“…The broad band at 3400 cm −1 indicates the O–H stretching vibration of the free or coordinated water molecules in the complex. 44 Peaks at 1555 and 1455 cm −1 representing the characteristic absorption peaks of the asymmetric and symmetric stretching vibrations of the carboxylate groups appear for complexes 1–5 , showing a shift compared with 1578 and 1422 cm −1 of the ligand. 45 The CO stretching vibration characteristic peaks of complexes 1–5 appear near 1705 cm −1 , which are red shifted compared with those of the ligand, 46 while the stretching vibration peaks of the C–O bond shift from 1261/1184 cm −1 to 1260/1226 cm −1 , respectively.…”

Syntheses, Crystal Structures, and Catalytic Properties of Three Cu(II) and Cobalt(II) Coordination Compounds Based on an Ether-Bridged Tetracarboxylic Acid

“…Following our consistent research path, we have chosen purchasable polycarboxylic acid ligands, which are rarely used in the synthesis of functional coordination polymers [10,13,25,26]. In the current study, we selected an ether-bridged tetracarboxylic acid: 3-(3,4-dicarboxyphenoxy)phthalic acid (H 4 dppa, Scheme 1).…”