Crystal structure of hexaaqua-bis(1,1'-biphenyl-2,2',6,6'-tetracarboxylic acid)cadmium(II) tetrahydrate, [Cd (H2O)6](C16H9O8)2 · 4H2O

A 3-D lanthanide coordination polymer constructed from biphenyl-2,2′,6,6′-tetracarboxylic acid: synthesis of a trinodal (3,4,5)-connected topology and luminescence

“…Multidentate organic polycarboxylates, such as 1,2-benzenedicarboxylate [40][41][42][43], 1,3,5-benzenetricarboxylate [44][45][46][47], and 1,2,4,5-benzenetetracarboxylate [48][49][50], have been used for construction of coordination polymers with multidimensional networks. We and others have used biphenyl-2,2′,6,6′-tetracarboxylic acid (H 4 bta) to yield discrete dinuclear complexes, 1D polymers, and 2D and 3D frameworks [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67]. The ligand has some unique features (Scheme 1): (a) it has a variety of coordination modes and completely/partially deprotonated forms with four carboxylic groups; (b) it is a flexible ligand and the two phenyl rings can rotate around the C-C single bond, which may help to construct chiral coordination polymers due to noncoplanarity of the phenyl rings; (c) it possesses D 2d symmetry, which is easy for assembly of higher symmetrical topological networks.…”

“…The ligand has some unique features (Scheme 1): (a) it has a variety of coordination modes and completely/partially deprotonated forms with four carboxylic groups; (b) it is a flexible ligand and the two phenyl rings can rotate around the C-C single bond, which may help to construct chiral coordination polymers due to noncoplanarity of the phenyl rings; (c) it possesses D 2d symmetry, which is easy for assembly of higher symmetrical topological networks. However, complexes based on H 4 bta mainly focus on Ag(I), Zn(II), Cd(II), Mn(II), Co(II), and Ni (II) ions, and no lanthanide coordination polymer has been reported so far [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67].…”