Synthesis and characterization of a new nano lead(II) 0-D coordination supramolecular compound: A precursor to produce pure phase nano-sized lead(II) oxide

Sonochemical synthesis of two novel Pb(II) 2D metal coordination polymer complexes: New precursor for facile fabrication of lead(II) oxide/bromide micro-nanostructures

Two new lead(II) coordination polymer complexes (CSCs) (2D), [Pb₂(L)₂(Br)₂]_n·H₂O (1), [Pb₂(HL^/)(L^/)(H₂O)₂]_n·H₂O (2), where L = C₆H₅NO₂ (2-pyridinecarboxylic acid) and L^/ = C₉H₆O₆ (1,3,5-tricarboxylic acid), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or microsized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy. Single crystal X-ray analyses on complexes 1 and 2 shows that Pb²⁺ ions are 8-coordinated, 7 and 9-coordinated, respectively. Topological analysis shows that the compound 1 and 2 are 4,6L26 and bnn net, respectively. However, neither the shape nor the morphology is maintained, showing the role of sonochemistry to modulate both morphology and dimensions of the resulting crystalline material, independently of whether we have a 2D coordination polymer (CP). Finally, micro structuration of lead(II) bromide oxide and lead(II) oxide have been prepared by calcination of two different lead (II) CPs at 700 °C that were characterized by SEM and XRD.

A novel high performance nano chemosensor for copper (II) ion based on an ultrasound-assisted synthesized diphenylamine-based Schiff base: Design, fabrication and density functional theory calculations

A novel high selective colorimetric chemosensor was introduced based on a nano diphenyl-based Schiff base (H₂L), 2,2'-((1E,1'E)-(((hexylazanediyl)bis(4,1-phenylene))bis(methanylylidene))bis(azanylylidene))bis(4-methylphenol) that synthesized using sonochemical method. H₂L was characterized by FT-IR, MS, TGA, ¹H NMR, ¹³C NMR, SEM and elemental analysis techniques, then fabricated as the portable strips for sensing copper (II) ions in aqueous media. The binding interaction between H₂L and various metal ions was investigated by UV-Vis spectroscopic that showed favorable coordination toward Cu²⁺ ion. H₂L exhibited binding-induced color changes from yellow to pink and practically no interference in the presence of other metal ions, i.e., Cr²⁺, Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Zn²⁺, Cd²⁺, Hg²⁺, Pb²⁺, Mg²⁺ and Ca²⁺. The chemsensor showd the color change from yellow to pink in presence of copper (II) ion in aqueous media due to binging of H₂L and Cu (II). This sensor can determine the copper (II) at in the rang of 7.5 × 10^-8-1.8 × 10^-5 mol L^-1 with a correlation equation: Absorbance = 0.0450[Cu²⁺] × 10^-6 + 0.71 and R² = 0.975 and low detection limit of 1.89 × 10^-8 mol L^-1. Density functional theory (DFT) calculations were carried out at the B3LYP levels of theory with B3LYP/6-311+G(d,p) and LANL2DZ/6-311+G(d,p) basis sets for chemosensor and its copper complex respectively. The optimized geometry, harmonic vibrational frequencies, ¹H NMR and ¹³C NMR chemical, Molecular orbital (M.O.), Mulliken population analysis (MPA), contour of Electrostatic Potential (ESP) and Molecular Electrostatic Potential (MEP) map of H₂L were calculated which show good agreement with behavior of sensor for detection of Cu²⁺ ion.

Sonochemical synthesis and characterization of new seven coordinated zinc, cadmium and mercury nitrate complexes: New precursors for nanostructure metal oxides

The nitrate complexes of group 12 elements with a tridentate Schiff base ligand (L = (E)-N1-((E)-3- phenylallylidene)-N2-(2-((E)-((E)-3-phenylallylidene) amino)ethyl) ethane-1,2-diamine) were synthesized via sonochemical process and characterized by various physical and chemical methods. The structural analysis of the zinc nitrate complex by single crystal X-ray diffraction analysis shows that the central atom is seven-coordinated by three nitrogen atoms from the Schiff base ligand as well as four oxygen atoms from two different nitrate anions. The geometry around the metal center can be described as a distorted pentagonal bipyramid. The crystal packing analysis of zinc nitrate complex indicates that the intermolecular interactions related to nitrate groups plays the essential role in the orientation of supramolecular structure. Hirshfeld surfaces (HS) and their corresponding fingerprint plots (FP) have been also used for further investigation of crystal structure of zinc nitrate complex. Furthermore thermal analyses (TG/DTG) of three nanostructure complexes were carried out and discussed. Finally, direct thermolysis of zinc and cadmium nitrate complexes in air atmosphere led to the production of zinc and cadmium oxide nanoparticles.

Sonochemical synthesis and characterization of a new nano Ce(III) coordination supramolecular compound; highly sensitive direct fluorescent sensor for Cu2

Micro and nano-structures of a new Ce(III) Coordination supramolecular compound, [Ce (1,5-NDS)_1.5(H₂O)₅]_n,1, (1,5-Naphthalenedisulfonic acid), were prepared using hydrothermal and sonochemical approaches, respectively. These new micro and nano structures were characterized by elemental analysis, IR spectra, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), and powder X-ray diffraction. The X-ray single crystal structure determination of 1 shows that it features a neutral 2D framework based on the [Ce₂H₂₀O₁₆S₂] clusters as a secondary building unit (SBU) which shows a sql/Shubnikov tetragonal plane net. Moreover by considering the H-bonds, the final structure can be considered as 3D supramolecular network. The influence of ultrasound irradiation time on the morphology and size of the nanostructure 1 was investigated. The results indicated that by increasing the time of ultrasonic radiation, smaller nanostructures form and morphological changes occur. Fluorescent properties of the nanoparticles of 1 were also investigated. Coordination polymer 1 shows high fluorescence intensity and good tendency to copper ion that can be used as an optical sensor for selective and sensitive determination of Cu²⁺ in aqueous media with detection limit of 3.0μM.