A NEW Zn(II) COMPLEX OF UNUSUAL UNIDENTATE COORDINATION OF 4,4?-BIPYRIDINE, A NEW PRECURSOR FOR THE PREPARATION OF ZINC(II) OXIDE NANOPARTICLES

zinc(II) 4 4?-bipyridine coordination polymer fluorescence nanoparticles

КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА ДВУХ ГИДРАТНЫХ фаз ТЕТРАХЛОРИДОКОБАЛЬТАТА(II) ЦИПРОФЛОКСАЦИНИЯ, CADMIUM(II) COMPLEX WITH (1?H-[2,2?]BIIMIDAZOLY-1-YL)-ACETIC ACID: SYNTHESIS, CRYSTAL STRUCTURE, AND LUMINESCENCE, ...

The compound forms monomeric units as a result of unusual unidentate coordination of 4,4-bipy ligands. <...> The thermal stability of the compound is studied by thermal analyses. <...> Furthermore, the complex is luminescent with emission maxima at 329 nm in the methanol solvent. <...> Different sizes of zinc(II) oxide nanoparticles are prepared by calcination of the [Zn(4,4-bipy)2(H2O)4](ClO4)2 Œ4(4,4-bipy) compound at two different temperatures. <...> These nanostructures are characterized by X-ray powder diffraction and scanning electron microscopy. <...> In recent years, a wide variety of networks have been designed using the inorganic coordination polymers that provide very interesting information about supramolecular systems [ 5—7 ]. <...> The Zn(II) ion is particularly appropriate for the construction of coordination polymers and networks [ 8—23 ]. <...> We describe here on the preparation, thermal properties and crystal structure of [Zn(4,4-bipy)2(H2O)4](ClO4)2Œ4(4,4-bipy) in the room temperature. <...> Different sizes of zinc(II) oxide nanoparticles were prepared from calcinations of compound [Zn(4,4-bipy)2(H2O)4](ClO4)2Œ4(4,4bipy) at two different temperatures. <...> The thermal behavior was measured with a PL-STA 1500 apparatus. 1H and 13C NMR spectra were measured with a BRUKER DRX-500 AVANCE spectrometer at 500 MHz and all chemical shifts are reported in units downfield from Me4Si. <...> The complex shows a broad emission band with the maximum intensity at 329 nm upon excitation at 295 nm (Fig. 2, b). <...> These fluorescent emissions can be tentatively assigned to the intraligand fluorescent emission, since a similar emission at 347 nm upon excitation at 295 nm can also be observed for free 4,4-bipy (Fig. 2, c). <...> SEM photograph of ZnO microparticles produced by calcination of precursor 1 at 400 ēC (a) and (b) tified by X-ray diffraction (Fig. 4) and the particle size was investigated with scanning electron microscopy (Fig. 5). <...> The average particle size is 65 nm, which is in approximate agreement with that observed by scanning electron microscopy, as shown in Fig. 5, a. <...> This image shows that ZnO nanoparticles have <...>

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