Ultrasonic synthesis of 1D-Zn(II) and La(III) supramolecular coordination polymers nanoparticles, fluorescence, sensing and photocatalytic property

Two new 1D-supramolecular coordination polymers, {[Zn(HIN)(IN)NCS]}(n) (SCP 1) and {[La(IN)(3)(H2O)(2)]}(n) (SCP 2) where (HIN = isonicotinic acid, IN = isonicotinate anion), had been successfully synthesized by self-assembly method. SCP 1 and 2 and their nanoparticles, prepared by sonochemical method, had been characterized by elemental analysis, TGA, UV/Vis and FT-IR spectroscopy, transmission electron microscopy (TEM), powder and single crystal X-ray diffraction. In SCP 1, zinc(II) ion is four-coordinated in a distorted terahedral environment with a ZnN2O2 core. The La(III) atom in SCP 2 adopts distorted trigonal prism, square face tri-capped (TPRS-9) geometry via coordination to seven oxygen atoms of six IN ligands and two oxygen atoms of water molecules. The structure of SCP 1 extends via O17 of IN ligand forming 1D-wave like structure chain while that of SCP 2 extends via coordinate bonds creating 1D-polymeric chain. The structures of SCP 1 and 2 extend to 2D- and 3D-networks via H-bonds and pi-pi stacking. Luminescence properties of the SCP 1 and 2 were studied as sensors for detection of common organic solvents and showed high sensing ability for detection of nitrobenzene. The nanoparticles of 1 and 2 were utilized for removal of methylene blue (MB) dye under UV-light irradiation and direct sunlight irradiation. Mechanism of degradation using different scavenger techniques was proposed and discussed.