A pair
of metal phosphonates, {[(CH3)2NH2][Zn2(HEDP)(BPDC)0.5(H2O)2]·H2O} (1) and {[CH3NH3][Zn2(HEDP)(BPDC)0.5(H2O)2]·3.5H2O} (2) (HEDP = 1-hydroxyethylidene
diphosphonate, H2BPDC = biphenyl-4,4′-dicarboxylic
acid), have been successfully synthesized by virtue of a dual-ligand
strategy. The Zn(II) centers in both 1 and 2 are bridged by the −PO3 units of HEDP to form
2D inorganic–organic hybrid layers. Adjacent Zn–HEDP
layers are further pillared and connected by linear O-containing linkers
to furnish 3D pillared-layer architectures showing a (3,4)-connected
network. Solid-state photoluminescence studies of compounds 1 and 2 have been performed, displaying intense
emissions at 335 and 340 nm under UV light irradiation, respectively.
Moreover, luminescence sensing experiments suggest that compound 1 exhibits a great selectivity and sensitivity for detection
of Cu2+/Fe3+, IO4
–/Cr2O7
2– and nitrobenzene,
which could be considered as a promising multiple sensor in an aqueous
system.
Room-temperature phosphorescence (RTP) materials with
recognizable
afterglow property have gained widespread attraction. Multicolor RTP
has added benefits in multiplexed biological labeling, a zero background
ratiometric sensor, a multicolor display, and other fields. However,
it is a great challenge to prepare multicolor RTP from a single-component
compound according to Kasha’s rule. Herein, we propose a strategy
to design multicolor RTP in a metal–organic hybrid framework
through constructing chromophores in both isolated
state and dimer state using a flexible tetradentate ligand. Two compounds
were synthesized that presented blue and green dual phosphorescence
with different lifetimes at ambient conditions. The photoluminescence
mechanism has been thoroughly studied by structure–property
analysis. This study provides various possibilities to prepare high-performing
RTP materials by the rational design and synthesis of similar compounds.
Two isostructural lanthanide (Ln) hybrid complexes co-bridged by organic oxalate and inorganic hypophosphite, [Ln(oxa)(HPO)(HO)] (oxa = oxalate; Ln = Gd (1), Dy (2)), were solvothermally prepared with the goal of elucidating the role of a hybrid framework in the generation of novel molecular magnetic materials. The title compounds feature a two dimensional (2D) hybrid layer. The Ln ions are octa-coordinated with distorted square antiprism geometry. The adjacent Ln ions are co-bridged by hypophosphite and one type of oxalate ligand to form 1D hybrid chains, which are further linked by a second type of oxalate ligand to generate the resulting 2D framework. Magnetic investigations reveal that compound 1 features a large magnetocaloric effect with -ΔS = 46.60 J kg K (134.39 mJ cm K), due to the combined advantages of organic oxalate and inorganic hypophosphite ligands, while compound 2 displays slow magnetic relaxation.
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