Solvothermal synthesis and structure of coordination polymers of Nd(III) and Dy(III) with rigid isophthalic acid derivatives and flexible adipic acid

Abstract Two new coordination polymers (CPs) with the formula [Nd(hip)(adip) 0.5 (H 2 O) 2 ] n .nH 2 O ( 1 ) and [Dy(aip)(adip) 0.5 (H 2 O) 2 ] n .nH 2 O ( 2 ) were synthesized by self-assembly of lanthanide salts with rigid [5-hydroxyisophthalic acid (H 2 hip)], [5-aminoisophthalic acid (H 2 aip)] and flexible [adipic acid (H 2 adip)] linkers under solvothermal conditions. The CPs 1 & 2 crystallize in monoclinic C 2/ c space group. Both the CPs have 1D linear ladder shaped extension with the linkages having the backbone of hip 2− , aip 2− and adip 2− ligands. The 1D linear ladder chains generate three dimensional (3D) supramolecular frameworks via significant π-π and hydrogen bonding interactions. The CP 2 (Dy) emit strong ligand sensitized characteristic f-f luminescence emission. The CP 2 also exhibit weak ferromagnetic interactions at low temperatures.