Two Types of Lanthanide Coordination Polymers of (2,3-f)-Pyrazino(1,10)phenanthroline-2,3-dicarboxylic Acid: Syntheses, Structures, and Properties

Abstract

Hydrothermal reactions of lanthanide oxides with a rigid ligand (2,3-f)-pyrazino(1,10)phenanthroline-2,3-dicarboxylic acid (H2PPDA) yielded 12 novel lanthanide coordination polymers with formulas [Ln(HPPDA)(PPDA)(H2O)2]·2H2O (Ln = Pr, 1·Pr; Nd, 2·Nd; Sm, 3·Sm; Eu, 4·Eu; Gd, 5·Gd; Tb, 6·Tb; and Dy, 7·Dy) and [Ln2 (PPDA)3 (H2O)4]·nH2O (Ln = Pr, n = 2, 8·Pr; Ln = Nd, n = 3, 9·Nd; Ln = Sm, n = 2,10·Sm; Ln = Eu, n = 1, 11·Eu; Ln = Gd, n = 1, 12·Gd). Single-crystal X-ray diffraction analysis reveals that they present two different structural types. Type I for 1·Pr−7·Dy possesses a two-dimensional 4·4 network, whereas type II for 8·Pr−12·Gd exhibits a two-dimensional framework with 3·6 topology. A rationalization for the synthetic pathways that lead to the formation of type I and type II is described. The synthetic reactions gave pure type I as the final product with the emergence of a small amount of type II as an intermediate within the reaction process. Photoluminescence, thermogravimetric, and magnetic analysis of type I were investigated.

Crystal structure of 4,4′-bipyridin-1-ium 3,3′,5′-tricarboxy-[1,1′-biphenyl]-2-carboxylate, (C26H18N2O8)

“…Its carboxylate group can also be used as hydrogen-bond acceptor. To our knowledge, the discrete subunits or low-dimensional entities have been linked highdimensional supramolecular compounds through hydrogen bonds, π · · · π stacking and host-guest interactions [6][7][8].…”

Crystal structure of 1,1'-(1,4-phenylenebis(methylene))bis(2-methyl-1Hbenzo[ d]imidazol-3-ium) 2,5-dicarboxyterephthalate, C17H14N2O4

“…Its carboxylate group can also be used as hydrogen-bond acceptor. To our knowledge, the discrete subunits or low-dimensional entities have been linked higher dimensional supramolecular compounds through hydrogen bonds, p×××p stacking and host-guest interactions [7][8][9]. In this contribution, we have report on as upramolecular network constructed via hydrogen bonds and p×××p interactions.The title structure comprises half of a1 ,1'-(1,4-phenylenebis(methylene))bis(2-methyl-1H-benzo …”

Crystal structure of 2-methyl-1-((4-((2-methyl-1H-benzo[d]imidazol-1-yl)- methyl)phenyl)methyl)-1H-benzo[d]imidazole (2,5-dicarboxybenzoate), C42H34N4O12

“…Its carboxylate group can also be used as hydrogen-bond acceptor. To our knowledge, the discrete subunits or low-dimensional entities have been linked highdimensional supramolecularc ompounds through hydrogen bonds, p×××p stacking and host-guest interactions [6][7][8].I nt his contribution, we have formed the interesting supramolecular network compound via hydrogen bonds and p×××p stacking interactions. Single-crystal X-raydiffractionreveals that compound 1is an ovelty supramolecular compound.…”