A series of luminescent lanthanide–cadmium–organic frameworks with helical channels and tubes

Abstract

Lanthanide (Ln) oxides and cadmium (Cd) salts as sources of metals provided the first series of luminescent Ln-Cd-organic frameworks, [LnCd(imdc)(SO4)(H2O)3].0.5H2O (Ln = Tb, Eu, Dy, Gd, Er, Yb, Y, Nd, Pr; H3imdc = 4,5-imidazoledicarboxylic acid), in which the Ln atoms are linked by imdc ligands with skew coordination orientation, resulting in novel hetero-metallic-organic frameworks with left-/right-handed helical tubes (L1/R1) and channels (L2/R2) along the b axis.

Hydrothermal synthesis, crystal structure, and photoluminescence of novel lanthanide metal organic frameworks constructed from 1,4-benzene-dicarboxylic acid and 1,2,4,5-benzenetetracarboxylic acid as ligands

“…The research of metal organic frameworks (MOFs) constructed through the connection of metal ions and multifunctional organic linkers has been enjoying intensive concern from the view of their elegant framework topologies as well as their promising serviceable applications in gas storage, catalysis, nonlinear optics (NLO), molecular sieves, and magnetic devices and heterogeneous catalysis [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Generally, it is a direct and common preparation routine for creating MOFs with novel structures and interesting prosperities to utilize functional metal ions as nodes and a versatile ligands as spacers.…”

Crystal structure of diaqua-bis(2-methyl-1H-imidazole-4,5- dicarboxylato-O,N)nickel, [Ni(H2O)2(C6H5N2O4)2]

“…Imidazole carboxylic acids have attracted much attention because of their structural diversity and their potential applications as functional materials [1,2]. Recently our group reported two transition metal (cadmium and cobalt) complex with the 2-methyl-1H-imidazole-4,5-dicarboxylic acid (H 3 MIA) ligand.…”

“…Recently our group reported two transition metal (cadmium and cobalt) complex with the 2-methyl-1H-imidazole-4,5-dicarboxylic acid (H 3 MIA) ligand. Although cadmium and cobalt complex have the same formula, they crystallize in two different crystal systems, and there are many differences in their structures [3,4] 2 ]. X-ray single crystal diffraction studies reveal that the nickel complex and cobalt complex are isostructural.…”

“…Ah eavy-walled pyrex tube containing am ixture of Ni(NO 3 ) 2 .· 6H 2O( 0.0285 g, 0.1 mmol), 2-methyl-1H-imidazole-4,5-dicarboxylic acid (0.034 g, 0.2 mmol), 0.65 mol/L NaOH solution (0.3 ml) and H 2 O(2mL) was frozen in liquid N 2 ,sealed under vacuum and placed inside an oven at 160°C. The green single crystals of the title compound suitable for X-ray analysis were then obtained after heating of 3d.Chemical analysis -found: C, 33.47 %; H, 3.43 %; N, 12.71 %; calculated for C 12 H 14 NiN 4 O 10 : C, 33.29 %, H, 3.23 %, N, 12.93 %.…”

Syntheses, Structures and Photophysical Properties of New Heterodinuclear Cd–Ln Coordination Complexes (Ln = Sm, Eu, Tb, Nd, Ho, Er)

“…[17] In addition, the selection of the central metal ions from the d block is extensive, for example, Os II , Cr III , Au I , Zn II , Cu I , Ag I , and so forth, [18][19][20][21][22][23] but the reports on heterometallic Cd-Ln complexes are rare. [24,25] We selected the Cd II ion to synthesize Cd-Ln complexes. This choice has two main reasons.…”