Syntheses, structures and photoluminescent properties of lanthanide coordination polymers based on pyridyl functionalized imidazole dicarboxylic acid

Abstract

A series of lanthanide coordination polymers formulated as {[Ln 2 (HPIDC) 6), Tm (7), Yb ( 8)] (H 3 PIDC = 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid, H 2 bdc = 1,4-benzenedicarboxylic acid) based on pyridyl functionalized imidazole dicarboxylic acid ligand have been synthesized by hydrothermal methods and characterized by single crystal X-ray diffraction, powder X-ray diffraction, elemental analysis and thermogravimetric analysis. Compounds 1-3 are one-dimensional (1D) cationic chains linked by the H 3 PIDC ligands, and the free H 2 PIDC 2 act as counter ions in the crystal lattice. Compound 4 displays a 2D layer built up from 3-connected HPIDC 22 ligands and 4-connected Dy(III) ions. While compounds 5-8 possess 2D network constructed from HPIDC 22 and bdc 22 ligands. The solid-state photoluminescent measurements show the photoluminescence of 1-5 are typical narrow emission bands of their lanthanide cations.

A two-dimensional cadmium(II) coordination polymer constructed from 4-carboxy-1-(4-carboxylatobenzyl)-2-propyl-1H-imidazole-5-carboxylate and 1-(4-carboxylatobenzyl)-2-propyl-1H-imidazole-4-carboxylate ligands

“…) We are interested in the coordination behaviour between nonsymmetrical tricarboxylate ligands and divalent metal ions, especially where the ligand can exhibit different degrees of deprotonation and thus diverse coordination modes. Imidazoledicarboxylic acid and its derivatives have been widely used with various types of metal ions for the construction of coordination polymers with interesting topologies (Xiong et al, 2013;Liu et al, 2013;Zhang et al, 2013). Here we have selected a new tricarboxylic acid, namely 1-(4-carboxybenzyl)-2-propyl-1H-imidazole-4,5-dicarboxylic acid (H 3 cpimda), which can be partially or fully deprotonated to generate the H 2 cpimda À , Hcpimda 2À and cpimda 3À anions under different reaction conditions.…”

Two Series of Substituent‐Group‐Directed Adipate‐Based Lanthanide Coordination Polymers: Syntheses, Structures, Photoluminescence, and Magnetism

“…For 2 (Figure ), the excitation sharp lines at 295, 307, 318, 332, 346, 363, 376, 391, 403, 418, 441, 453–480, 500, and 531 nm can be ascribed to the 4 H 15/2 → 4 F 9/2 / 4 I 9/2 , 4 H 15/2 → 4 P 5/2 , 4 H 15/2 → 4 P 3/2 , 4 H 15/2 → 4 G 9/2 , 4 H 15/2 → 4 D 7/2 , 4 H 15/2 → 6 P 5/2 / 4 D 5/2 , 4 H 15/2 → 6 P 7/2 , 4 H 15/2 → 4 L 15/2 , 4 H 15/2 → 6 P 3/2 , 4 H 15/2 → 4 P 5/2 / 6 P 5/2 , 4 H 15/2 → 4 M 17/2 / 4 G 9/2 , 4 H 15/2 → 4 I 11/2 / 4 I 13/2 , 4 H 15/2 → 4 G 5/2 , and 4 H 15/2 → 4 F 3/2 transitions of Sm III , respectively. [23a] The emission spectrum of 2 (Figure ) excited at 404 nm displays the characteristic emissions of Sm III at 562 ( 5 G 2 → 6 H 5/2 ), 597 ( 5 G 2 → 6 H 7/2 ), 643 ( 5 G 2 → 6 H 9/2 ), and 705 nm ( 5 G 2 → 6 H 11/2 ), respectively . The most intense 5 G 2 → 6 H 9/2 emission at 643 nm is responsible for the pink luminescence of the Sm III ion.…”

Two d10 metal–organic frameworks based on a novel semi‐rigid aromatic biscarboxylate ligand: Syntheses, structures and luminescent properties

“…[54][55][56][57][58][59][60][61][62][63] Typically, luminescent materials have been extensively explored for their diverse functionalities and application in sensing and optical devices. [64][65][66] The syntheses and preparation of MOFs are mainly dependent on several factors, such as center metal ions, [67][68][69] organic ligands, [70,71] inorganic/organic anions, [72][73][74] the ratios of metals and organic ligands, [75] pH values, [76,77] reaction temperature, [78,79] and reaction time. [80] Among these, the organic ligands and center metals play vital roles in the synthesis of MOFs.…”