Structure Variation from One-Dimensional Chain to Three-Dimensional Architecture: Effect of Ligand on Construction of Lanthanide Coordination Polymers

Abstract

Four lanthanide coordination polymers were constructed from mixed ligands of phenanthroline derivative and flexible polydentate ligands, [Gd 2 (1,3-BDC) 3 (MOPIP) 2 ] n •nH 2 O (1), [Gd(1,4-BDC) 1.5 (MOPIP)] n (2), [Yb(1,4-BDC) 1.5 (MOPIP)] n (3) and [Sm(1,4-BDC) 1.5 (MOPIP)] n (4), (MOPIP = 2-(4-methoxyphenyl)-1Himidazo[4,5-f ][1,10]phenanthroline, 1,3-BDC = benzene-1,3-dicarboxylic acid, 1,4-BDC = benzene-1, 4-dicarboxylic acid). The polymers have been synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffraction analysis. Compound 1 possesses one-dimensional chain structure, and expands into the three-dimensional supramolecular architecture by π • • • π stacking and hydrogen-bonding interactions. Meanwhile, compounds 2-4 exhibit three-dimensional frameworks with pcu topology (4 12 •6 3). The structural differences among such compounds show that the steric hindrances of benzene dicarboxylic acid ligands play a key role in the assembly and the structures of the title compounds. Compounds 1 and 2 act as efficient Lewis acid catalysts for the cyanosilylation of benzaldehyde in high yields, due to the strong Lewis acidity.

Heteroleptic LaIII Anilate/Dicarboxylate Based Neutral 3D-Coordination Polymers

“…Metal−organic frameworks (MOFs) and coordination polymers (CPs) are an emerging class of microporous solids, which have been intensively studied during the last two decades due to their structural and functional diversity. They have potential applications as gas adsorbents [ 1 , 2 , 3 ]; luminescent [ 4 , 5 , 6 , 7 ]; electrochemical or photophysical sensors [ 8 , 9 ]; and catalytic [ 10 , 11 , 12 ], optical [ 13 ], electrically conductive [ 14 ], and magnetic materials [ 15 , 16 , 17 , 18 ]. The physical and chemical properties, crystalline structure and topologies of coordination polymers depend on the properties of the organic ligands and/or the metal ions.…”