Syntheses, structures and properties of three metal–organic complexes containing 2,2′-dipyridyl-5,5′-dicarboxylate ligands

Copper/Zinc-Directed Heterometallic Uranyl-Organic Polycatenating Frameworks: Synthesis, Characterization, and Anion-Dependent Structural Regulation

“…Furthermore, these “ladder pairs” assemble through hydrogen bonds of Hbpdc – ligands and pack along the a -axis (Figure S7). According to the previous literature, these supramolecular interactions are useful to the formation and stabilization of compound 2-Cu′ …”

“…In compounds 1-Cu and 1′-Zn , uranyl ions in neighborhood are first connected by the bpdc linkers in 1-mode A to form 1D chains, which are further joined together via the bpdc linkers in 1-mode B through the coordination bonds of Cu­(II) or Zn­(II) cations to generate the final 3D frameworks. Interestingly, the degree of connectivity in the 3D frameworks of 1-Cu or 1′-Zn is even higher than those in the Cu­(II)-bpdc and Zn­(II)-bpdc complexes with only single Cu­(II) or Zn­(II) metal center, which were synthesized under similar hydrothermal conditions. ,, As demonstrated above, introducing a second metal ion may be helpful for constructing coordination polymers with higher dimensional structures.…”

“…Among these O/N mixed ligands, only N-containing monocarboxylic acid ligands, i.e., nicotinic or isonicotinic acid, have been attempted to assemble uranyl organic frameworks, ,,− while N-containing polycarboxylic acids, with more than one carboxylate group, have been rarely concerned. For example, 2,2′-bipyridine-5,5′-dicarboxylic acid ( H 2 bpdc ), which can be considered as an integration of 4,4′-biphenyl dicarboxylic acid and 2,2′-bipyridine, has not been employed to prepare uranyl-organic compounds, though it had been widely used for the construction of mono- and bimetallic coordination polymers. − Compared to the N-containing monocarboxylic acids, the rigid dicarboxylic acid moieties of H 2 bpdc ligand make it more suitable for the construction of MOF-like uranyl-organic frameworks. Meanwhile, two spare nitrogen atoms of pyridine groups can afford an additional cross-linking ability by coordination with other heterometallic ions (i.e., d-block transition metal ions).…”

Synthesis and Characterization of a New Nickel(II) Compound Derived from [BW12O40]3- and 2,2'-Bipyridyl

“…These water molecules that interact more strongly with the POM frame are separated from 80 to 200 °C (Canioni et al 2011). The second weight loss of 8.3% at 560 °C can be attributed to the decomposition of the 2,2′-bipy (Liu et al 2015).…”

“…These water molecules that interact more strongly with the POM frame are separated from 80 to 200 °C (Canioni et al 2011). The second weight loss of 8.3% at 560 °C can be attributed to the decomposition of the 2,2′-bipy (Liu et al 2015). The final mass loss around 880 °C (25.6%) is attributed to the complete rupture of the remainder POM cluster (Lan et al 2013).…”