Hydrothermal Syntheses, Crystal Structures, and Luminescence Properties of Lanthanide-Based Coordination Polymers Constructed by Sulfonate Functionalized Imidazophenanthroline Derivative Ligand

Ten
new LnIII-H3sfpip compounds [Pr­(Hsfpip)­(fum)0.5(H2O)]n·n(H2O) (1), [Ln­(Hsfpip)­(glu)0.5(H2O)2]n·n(H2O) (Ln = La (2), Pr (3), Sm (4)), [Ln2(Hsfpip)2(OH)2(H2O)6]n·2n(H2O) (Ln = Dy
(5), Ho (6), Er (7)), [La­(Hsfpip)­(adip)0.5(H2O)2]n (8), [Y­(Hsfpip)­(suc)0.5(H2O)3]n·n(H2O) (9), and [Y­(Hsfpip)­(adip)0.5(H2O)2]n·n(H2O) (10) (H2fum =
fumaric acid, H2suc = succinic acid, H2glu =
glutaric acid, H2adip = adipic acid, H3sfpip
=2-(2,4-disulfophenyl)­imidazo­(4,5-f)­(1,10)-phenanthroline)
have been synthesized under hydrothermal conditions and characterized
by elemental analysis, IR, and single crystal X-ray diffraction. Compounds 1–4 possess 2D layered structures based
on alternately arranged loop chains with fum2– anions
and glu2– anions as bridges, respectively. Compounds 5–7 are isostructural and show 2D layered
structures containing binuclear Ln2 units, while the hydroxyl
groups participated in the construction of structures. Compound 8 is a 3D network built up by polygonal La2(COO)2 binuclear units. Compound 9 displays a 2D layer
which is extended to a 3D supramolecular framework by means of weak
interactions. Compound 10 presents a 3D network structure
with (adip)2– anions as bridges. The versatile structures
well exhibit the rich coordination chemistry of H3sfpip
and the coordination geometries of LnIII ions. In addition,
the photoluminescence and thermal stabilities of 1–10 were also studies.