Self-Assembly of Discrete Metallocycles versus Coordination Polymers Based on Cu(I) and Ag(I) Ions and Flexible Ligands: Structural Diversification and Luminescent Properties

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 AgCF 3 SO 3 and AgClO 4 salts leads to the formation of discrete binuclear metallocycles {Ag(L1)CF 3 SO 3 } 2 (1) and {Ag(L1)ClO 4 } 2 (2), respectively. However, self-assembly of the other ligand, L2, with AgCF 3 SO 3 and CuCl salts, results in a 1-D zig-zag chain {Ag(L2)CF 3 SO 3 } 8 (3) and a 1-D double-stranded helical chain {Cu 2 Cl 2 (L2) 2 } 8 (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.

Crystal structure of catena-poly[diaqua-bis(μ2-ethane-1,2-diyl-bis(pyridine-3-carboxylate-κ2 N:N′))copper(II)] dinitrate, C28H28CuN6O16

“…This paper forms part of our continuing study of the synthesis, structural characterization and physical properties of coordination polymers [2]. The Cu atom exists in a square-planar CuN4 coordination geometry; it lies on an inversion center.…”

Crystallization Induced Enhanced Emission in Two New Zn(II) and Cd(II) Supramolecular Coordination Complexes with the 1-(3,4-Dimethylphenyl)-5-Methyl-1H-1,2,3-Triazole-4-Carboxylate Ligand

“…The incorporation of carboxylate groups enhances the coordination capability, enabling the growth of the coordination network in the coordination compounds [ 38 , 39 , 40 ]. Interactions between this type of ligands and metal centers could give information about their synergistic capability, on the antenna effect, charge transfer transitions, or π-system extension that have been studied previously in other systems [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

The crystal structure of N,N′-(4,4′-oxydibenzyl)-bisisonicotinamide 3.5 hydrate, C24H24N4O6

“…This paper forms part of our continuing study of the synthesis, structural characterization and physical properties of coordination polymers [2] and references therein. There are seven water molecules and two organic molecules in the asymmetric unit.…”