Dicompartmental non-macrocyclic ligands containing six (N4O2) and four (N2O2) coordination atoms were prepared. The ligands were constructed in order to investigate the effect of an opened four-coordination site (non-marcocyclic effect) on the geometrical structure of a complex in a six-coordination site with a labile metal. In this regard, monometallic non-macrocyclic complexes of Zn(II), Co(II), and Co(III) were prepared and characterized. The preparation of a Co(III) complex through two different routes, and also the X-ray crystal structure of a Zn(II) complex demonstrated that the structures of the complexes were intact even in the presence of two bulky phenyl groups in four-coordination site. The characterization of the prepared complexes confirmed the presence of two protons in the four-coordination site of diimine complexes and a lack of them in diamine complexes.
Cupric oxide is a p-type semiconductor with a narrow band-gap which is suitable for catalysis, electrochemical cells, field emission devices and gas sensor applications. Despite considerable efforts devoted to the preparation of the nanosized CuO, there is a lack of information about ultrasonic-assisted (US) preparation methods. Nanosized cupric oxide was successfully prepared through different ultrasonic-assisted (US) preparation methods. Furthermore, the influence of preparation method on the structure, morphology and optical properties of nanosized CuO has been reported. XRD patterns were identical to the single-phase pure CuO with a monoclinic structure. The enhancement of the crystallinity and crystallite size was observed for the sample prepared through the US thermal decomposition. The absorption band of CuO nanocrystals prepared through the US liquid hydrolysis shows a clear red shift of about 40 nm compared to those obtained with other preparation methods. Our results indicated that almost spherical CuO nanoparticles with an average size of 65 nm were prepared during the US thermal decomposition, while CuO rod-like nanostructures with an average diameter of about 16 nm were obtained via the US liquid hydrolysis method. The band gap values of nanosized CuO samples were larger than the reported value for the bulk CuO. Synthesized CuO samples by US methods with adjustable and controllable properties make the applicability of cupric oxide even more versatile.
A simple hydrolysis process has been developed to prepare nanosized cupric oxide using cupric acetate as a starting material. In addition, the effects of different pH values varying from 5 to 10 and ultrasonic irradiation on the structure, morphology and optical properties of nanosized CuO samples have been investigated. Samples were characterized using X-ray diffraction, Fourier transform spectroscopy, scanning electron microscopy, transmission electron microscopy and UV–Vis spectroscopy. X-ray diffraction patterns of samples were identical to the single-phase pure CuO with a monoclinic structure. Our results indicated that properties of samples had great dependence on the reaction pH and ultrasonic irradiation. The crystallite size increased with increasing the pH value from 5 to 10. The band gap of samples was estimated to be in the range of 2.0–2.9 eV, which is larger than the reported value for bulk CuO. Synthesized CuO samples with adjustable and controllable optical properties make the applicability of cupric oxide even more versatile.
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