Sumit Sanotra

Sonochemical synthesis of a novel nanorod diaqua(pyridine-2,6-dicarboxylato)copper(II) 3-D supramolecular network: new precursor to prepare pure phase nanosized copper(II) oxide

A nanosized copper(II) supramolecular compound, [Cu(dipic)(H2O)2] n (1) [dipic = 2,6-pyridinedicarboxylate], has been synthesized by sonochemical method and characterized by elemental analysis, scanning electron microscopy, X-ray powder diffraction, IR spectroscopy, TGA/DTA, and BET surface area studies. The structure of single crystalline 1 developed from nanosized 1 has been determined by X-ray crystallography and further characterized by scanning electron microscopy, TGA/DTA, and BET surface area studies. The XRD studies reveal that nanorod copper(II) supramolecular compound adopts a 3-D supramolecular network owing to extensive hydrogen-bonding and π–π stacking. Solvent effects on size and morphology of nanosized 1 have been studied. Calcination of nanosized 1 at 500°C under air yields CuO nanoparticles.

Room temperature aqueous phase synthesis and characterization of novel nano-sized coordination polymers composed of copper(II), nickel(II), and zinc(II) metal ions with p-phenylenediamine (PPD) as the bridging ligand

Nanostructured metal-organic hybrid materials composed of nickel(II), copper(II), and zinc(II) metal ions and p-phenylenediamine (PPD) as the organic ligand were synthesized in aqueous medium at room temperature. The synthesized compounds were characterized by elemental analyses, powder X-ray diffraction (PXRD) spectra, Fourier transform infrared spectra, nuclear magnetic resonance (1H NMR) spectra, electronic spectra, scanning electron microscopy, N2 adsorption-desorption isotherm, and dynamic light scattering studies. N2 adsorption-desorption isotherm of copper(II)-PPD compound confirmed that it has mesoporous structure as it exhibits type-IV reversible isotherm with H1 hysterisis. Steep adsorption indicated that the mesopores possessing it are of uniform order. Barrett-Joyner-Halenda model showed an average pore diameter of 5.2 nm. The PXRD patterns of all the three compounds are identical and showed well-defined and highly intense diffraction peaks, thereby suggesting their nature as crystalline. The broadness of the diffraction peaks indicated that the particles are of nanometer dimensions.

Synthesis, crystal structure, photoluminescence, and DFT studies of bis(1,10-phenanthroline)di(κ2OO′ nitrato)cadmium(II) [Cd(phen)2(NO3)2]

A cadmium 1,10-phenanthroline complex, [Cd(phen)2(NO3)2] has been synthesized by and its crystal structure determined. The compound is monoclinic, C2/c, a=11.5008(2), b=15.3523(2), c=13.2767(2)Å, β=103.610(2), Z=4. The compound is monomeric with a octacoordinate cadmium ion bonded to two bidentate 1,10-phenanthroline molecules and two bidentate nitrate units. The metal ion is bis-chelated by two N-heterocycles as well as by two nitrate ions in a distorted dodecahedral CdN4O4 coordination environment. The complex is thermally stable up to 110°C. Photophysical investigation reveals that complex is luminescent in the solid state. The molecular geometry, harmonic vibrational frequencies and bonding features of complex [Cd(phen)2(NO3)2] in the ground-state have been calculated by using the density functional B3LYP method with 3-21G (d, p) as higher basis set. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. Finally the calculation results were applied to simulate infrared spectrum of the title compound which show good agreement with observed spectrum.

Hydrothermal synthesis and crystal structure of novel bis(6-carboxypyridine-2-carboxylato-κ3O2,N,O6)nickel(II) trihydrate, Ni(Hpydc)2·3H2O

The synthesis and crystal structure of the compound bis(6-carboxypyridine-2-carboxylato-κ(3)O(2),N,O(6))nickel(II) trihydrate, Ni(Hpydc)(2)·3H(2)O, with a supramolecular network is reported (H(2)pydc is pyridine-2,6-dicarboxylic acid). The compound has been prepared by hydrothermal methods. The crystal structure has been solved by direct methods using single-crystal X-ray diffraction data collected at 293 K and refined by full-matrix least-squares procedures to a final R value of 0.0323 for 2779 observed reflections. The compound has distorted octahedral geometry around the metal centre. The complex contains two identical singly ionized ligand molecules. The nickel(II) is bonded to four O atoms and two N atoms from the tridentate ligand molecules, which are nearly perpendicular to each other. Hydrogen-bonded interactions create a three-dimensional supramolecular porous network. The supramolecular structure accounts for the porous structure of the compound as is evident from the Brunauer, Emmett & Teller (BET) surface area of 80 m(2) g(-1). Thermal degradation of the compound shows that lattice water molecules give stability to the crystal structure.

Hydrothermal synthesis and crystal structure of a supramolecular dinuclear cobalt(II) complex containing the dianion of pyridine-2,6-dicarboxylic acid

Abstract Reaction of cobalt nitrate hexahydrate with pyridine-2,6-dicarboxylic acid (H2pydc) under hydrothermal conditions gave a supramolecular network containing the complex [Co(H2O)5][Co2(pydc)2]·2H2O. The compound was characterized by elemental analysis, infrared spectroscopy, single-crystal diffraction, and TGA/DTA studies. The complex crystallized in the monoclinic space group P21/c with four molecules per unit cell. Determination of the structure revealed that two independent cobalt(II) ions, each having a different coordination environment are bridged through carboxylate ligands. A three-dimensional supramolecular network having a porous structure is extended by hydrogen bonding.Graphical Abstract