A luminescent metal-organic framework with an open cubic cage and eight-coordinate cadmium nodes

Abstract

1) Crystal data for 1: (H 4 N) 2 Cd(H 2 PA) 2 (DMF) 4 ·6H 2 O, Mr = 1321.68, monoclinic, space group Cc, a = 28.333(4) Å, b = 11.0343(15) Å, c = 20.516(3) Å,  = 120.878(3), V = 5505.0(13) Å 3 , T = 293 K, Z = 4, calcd = 1.536 g cm 3 , (Mo-K) = 0.486 mm 1 , S = 0.895, 5994 reflections measured, 4006 unique (R int = 0.0330), R 1 = 0.0734, wR 2 = 0.2454 (all data).2) Preparation and analytical data for 1: Pamoic acid (0.078 g, 0.2 mmol) was dissolved in 5 mL of DMF. 10 mL of an aqueous solution of Cd(ClO 4 )·6H 2 O (0.084 g, 0.2 mmol) was then added dropwise to this solution and the pH of the mixture was adjusted to 5 by dilute NH 3 ·H 2 O. After stirring for about 3 h, a yellow solution was obtained. After filtration, the filtrate was kept in air for several days. Yellow hexagonal tablet-shaped crystals of 1 were produced in 39% yield. Elemental analysis for 1:Self-assembly of cadmium ions and the rigid bridging ligand 4,4′-methylenebis(3-hydroxy-2-naphthoic acid) (pamoic acid, H 4 PA) leads to a one-dimensional metal-organic framework with open cube-like M 2 (H 2 PA) 2 cages within its backbone, and exhibiting interesting yellow fluorescence. framework, eight-coordinate cadmium, cubic cage, fluorescence, pamoic acid

A 2D layered Cd(II) coordination polymer supported by in situ generated tetracarboxylate ligand: luminescence sensing for Co2+ ions

“…The document has reported that free 4,4’‐bipy ligand is almost nonfluorescent in the visible light range [29] . Therefore, the luminescence of 1 may be attributed to intraligand of H 2 L 2− or ligand‐to‐ligand charge transfer (H 2 L 2− →4,4’‐bipy or 4,4’‐bipy→H 2 L 2− ) due to the stable d 10 electronic configuration of Cd 2+ ions [30‐31] . Further calculation of CIE chromaticity coordinate for 1 indicated that compound 1 may be served as a good candidate for blue luminescent material (Figure S2 inset).…”

“…4,4'-bipy or 4,4'-bipy!H 2 L 2À ) due to the stable d 10 electronic configuration of Cd 2 + ions. [30][31] Further calculation of CIE chromaticity coordinate for 1 indicated that compound 1 may be served as a good candidate for blue luminescent material (Figure S2 inset).…”

Crown Ether‐Based Supramolecular Polymers: From Synthesis to Self‐Assembly

“…4 and 5 could self‐assemble to form CSP through the host–guest interaction of B21C7–SAS ( Figure ). [ 32 ] They proved that monomer concentration was a pivotal factor for the formation of CSP. Because of the stimulus‐responsiveness of host–guest interaction and the dynamic nature of disulfide bonds, the linear CSP possessed pH‐, ion‐, redox‐, and light‐response properties.…”

A disulphide bond-mediated hetero-dimer of a hemoprotein and a fluorescent protein exhibiting efficient energy transfer

“…7 Additionally, a disulphide bond cross-linkage is now commonly used in polymerization by dynamic covalent bonds. 8 The use of the disulphide bond as the linkage structure provides stability, 9 reversibility, 10 and stimuli responsiveness 11 in dynamic smart materials. Although the disulphide linkage can be formed spontaneously under aerobic conditions, 12 this type of random air-oxidation reaction can lead to mixed disulphide aggregations.…”