排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
Zazoua Hanane Touahra Fouzia Sehailia Moussa Chebout Redouane Lerari Djahida Bachari Khaldoun Saadi Adel 《Research on Chemical Intermediates》2019,45(5):3273-3290
Research on Chemical Intermediates - Delafossite mixed metal oxides of the form BaCuO2 and BaCu1M1?xO2 (M?=?Ni, Fe and Co) were successfully synthesized following a sol–gel... 相似文献
2.
Ilhem Kaabi Tahar Douadi Djahida Haffar Salah Chafaa Magali Allain Mustayeen A. Khan Gilles M. Bouet 《Transition Metal Chemistry》2007,32(5):666-673
The crystal structure of a new symmetrical pentadentate N2O3 Schiff base: di[4-(phenylimino)pentan-2-one] ether (H2L) is described. In the solid state, the ligand appears as a keto-imine tautomer, while in DMSO solution, the eneamine form
is observed. This ligand coordinates cobalt(II), nickel(II), copper(II) and cadmium(II). The structures of these new complexes
are described using infrared and electronic spectroscopy, 1H-n.m.r. and d.s.c. The cyclic voltammograms of the ligand and the complexes in DMF are discussed. 相似文献
3.
New phases with initial composition (1 ? x)CaTiO3 ? xNaF ? xMgF2 (0 ≤ x ≤ 0.20) have been prepared at low temperature (950 °C) from mixtures of CaTiO3 and fluorides NaF and MgF2. The oxyfluorides obtained have been characterized by X-ray diffraction at room temperature and indexed by isotypy with orthorhombic CaTiO3. The microstructures of these phases are observed by scanning electron microscopy. Dielectric measurements have been carried out during cooling cycle from 500 °C to room temperature at two frequencies (100 Hz, 1 kHz). Differential scanning calorimetry (DSC), thermogravimetry (TG) and differential thermogravimetry (DTG) analyses have been performed, respectively, from room temperature up to 550 °C (DSC) and 920 °C (TG–DTG). The dielectric measurements revealed two anomalies which have been confirmed by DSC analyses. These phenomena are ascribed to second order phase transitions. The variation of the real permittivity with temperature is in agreement with the class I capacitor specifications. However, the dielectric losses have to be improved. 相似文献
4.
Haffar Djahida Douadi Tahar Chafaa Salah Khan Mustayeen A. Bouet Gilles 《Transition Metal Chemistry》2004,29(3):245-250
We have prepared and characterised a new series of metal complexes obtained from 4,4-bis(salicylideneimino)diphenylethane (saldipH2) and cobalt(II), copper(II) and cadmium(II) chlorides. In every case, the coordinating atoms are N and O. However, each compound has its own structure:[Co(saldip)]·2 H2O is monomeric and a mononuclear species, [Cu2(saldip)2(H2O)] is a binuclear complex and finally the cadmium complex is formulated as:[(CdCl2)2(saldipH2)]·CdCl2. An electrochemical study (cyclic voltammetry) indicates that the reduction, as well as the oxidation, of copper in [Cu2(saldip)2(H2O)] proceeds in two steps. For the reduction of the two other complexes, two steps are indicated out: the first is attributed to the reduction of the metal and the second to the reduction of the coordinated ligands. 相似文献
1