An unprecedented 2D → 3D polythreaded metal-lomefloxacin complex assembled from sidearm-containing 2D motifs

An unprecedented entangled metal-lomefloxacin complex, [Cd(1,4-bdc)(lomeH)]·1.25H2O (1) (1,4-bdc = 1,4-benzendicarboxylate, lomeH = lomefloxacin), displays a (2D → 3D) polythreaded framework self-assembled from 2D (4,4) nets with dangling lomeH ligands, which, not only represents the first and only example of polythreaded metal-quinolone complex, but also represents the first entangled coordination polymer constructed from mixed lomefloxacin and dicarboxylate ligands. Furthermore, when the strong hydrogen bonds between layers are taken into account, the resulting net of 1 becomes a binodal (3,10)-connected 3D self-penetrating network with an unprecedented (4.52)2(46.520.617.82) topology, which represents the first binodal (3,10)-connected self-penetrating network observed in coordination polymers.