Abstract
Two new coordination polymers were synthesized solvothermally using 4,4'-dimethoxy-3,3'-biphenyldicarboxylic acid (H2dmbpdc), and di- and trivalent metal salts (Cu(NO3)2·2.5H2O and La(NO3)3·6H2O). Their structures were determined by single-crystal X-ray diffraction analysis, and their thermal stability was evaluated by thermogravimetric analysis. The copper compound Cu(dmbpdc)(DMF; N,N-dimethylformamide), CPO-71-Cu, is based on the well known copper acetate paddlewheel secondary building unit. The asymmetric unit comprises one copper cation with one DMF molecule and one linker molecule coordinated. The lanthanum compound La2(dmbpdc)3(DMF)(H2O)3, CPO-72-La, is formed from a dimer of nine-coordinate, edge sharing lanthanum cations. To this dimer, three water molecules and one DMF molecule are coordinated in an ordered fashion. In addition, the asymmetric unit contains three crystallographically unique linker molecules. Both CPO-71-Cu and CPO-72-La form two-dimensional layered structures, and topological analyses reveal sql topologies with point symbol 4(4)·6(2) and vertex symbol 4·4·4·4·6(2)·6(2). The thermal behavior of CPO-71-Cu was investigated in an in situ structural analysis by variable temperature powder- and single-crystal X-ray diffraction.
Highlights
Coordination polymers (CPs) and metal–organic frameworks (MOFs) have attracted significant attention in the literature in the last decades
The solvothermal synthesis of 4,4′-dimethoxy-3,3′-biphenyldicarboxylic acid and either Cu(NO3)2·2.5H2O or La(NO3)3· 6H2O resulted in two new CPs; CPO-71-Cu and CPO-72-La (Table 1)
Topological analyses with the TOPOS40 software[26] reveal that the underlying topologies of the structures are the same. Both CPO-71-Cu and CPO-72-La are based on cation dimers that form four-connected nodes coupled by linker molecules
Summary
Coordination polymers (CPs) and metal–organic frameworks (MOFs) have attracted significant attention in the literature in the last decades. The compounds can be both porous and non-porous with interesting properties within highly diverse fields such as gas separation and sorption, catalysis, magnetism and optical applications.[1,2,3,4,5,6,7]. Investigating the properties of known MOFs and coordination polymers is a highly active research field. The new coordination polymers are layered 2D structures based on dinuclear metal SBUs, not previously reported in combination with H2dmbpdc. This is the first report of a coordination polymer combining H2dmbpdc and a trivalent rare-earth cation
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