Abstract
Three new Ag(I) and one Cu(I) coordination compounds with two different positional isomers, propane-1,3-diyl bis(pyridine-4-carboxylate) (L1) and propane-1,3-diyl bis(pyridine-3-carboxylate) (L2), of a bis-(pyridyl-carboxylate) ligand have been synthesized. X-ray diffraction analysis revealed that the self-assembly of L1 with AgCF3SO3 and AgClO4 salts leads to the formation of discrete binuclear metallocycles {Ag(L1)CF3SO3}2 (1) and {Ag(L1)ClO4}2 (2), respectively. However, self-assembly of the other ligand, L2, with AgCF3SO3 and CuCl salts, results in a 1-D zig-zag chain {Ag(L2)CF3SO3}∞ (3) and a 1-D double-stranded helical chain {Cu2Cl2(L2)2}∞ (4) coordination polymers, respectively. Solid emission spectra recorded at room temperature show interesting luminescence properties for all four compounds in the range from 438 to 550 nm, especially for compound 4 that was found to change its emission color when the wavelength of the excitation radiation is switched from 332 to 436 nm.
Highlights
Self-assembly of coordination polymers and metal-organic frameworks (MOFs) [1,2,3] has been attracting great attention in the last decade, mainly because of their great potential as functional materials for diverse technological applications [4,5,6,7,8]
From the structural point of view, the two principal themes in this field have been the synthesis of compounds having either discrete molecular architectures with polyhedral or polygonal shapes or infinite coordination polymers in one, two, or three-dimensions (1-D, 2-D, or 3-D) of metal ions in combination with deliberately-tailored organic ligands
In this study we report the synthesis, the crystal structures, and the luminescent properties of four such d10 complexes formed with the isomeric bis-(pyridyl-carboxylate) ligands L1 and L2 and different metals or counteranions: {Ag(L1)CF3 SO3 }2 (1), {Ag(L1)ClO4 }2 (2), {Ag(L2)CF3 SO3 }8 (3), and {Cu2 Cl2 (L2)2 }8 (4)
Summary
Self-assembly of coordination polymers and metal-organic frameworks (MOFs) [1,2,3] has been attracting great attention in the last decade, mainly because of their great potential as functional materials for diverse technological applications [4,5,6,7,8]. From the structural point of view, the two principal themes in this field have been the synthesis of compounds having either discrete molecular architectures with polyhedral or polygonal shapes or infinite coordination polymers in one-, two-, or three-dimensions (1-D, 2-D, or 3-D) of metal ions in combination with deliberately-tailored organic ligands. In the latter case, the resulting network topology [15] for the supramolecular complex can be usually more or less predicted by selecting the chemical structure of the organic ligands and the usual coordination geometry of the metal ions linking them together in the final structure [16]. In this study we report the synthesis, the crystal structures, and the luminescent properties of four such d10 complexes formed with the isomeric bis-(pyridyl-carboxylate) ligands L1 and L2 and different metals or counteranions: {Ag(L1)CF3 SO3 }2 (1), {Ag(L1)ClO4 }2 (2), {Ag(L2)CF3 SO3 }8 (3), and {Cu2 Cl2 (L2)2 }8 (4)
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