| Transient analysis of induction generator jointed to network at balanced and unbalanced short circuit faults In wind power stations, induction machines are used as induction generators. Transient stability analysis of induction generator used in wind power station, joint to infinite bus, before and ... [ 18 آبان 1387 ] | Optical detection of phenolic compounds based on the surface plasmon resonance band of Au nanoparticles An indirect colorimetric method is presented for detection of trace amounts of hydroquinone (1), catechol (2) and pyrogallol (3). The reduction of AuCl4- to Gold nanoparticles (Au-NPs) by these phenolic compounds in the presence of cetyltrimethylammonium chloride (CTAC) produced very intense surface plasmon resonance peak of Au-NPs. The plasmon absorbance of Au... [ 18 آبان 1387 ] |
| اثر ممانعت فضایی لیگاند ارتو-تولیل بر روی رفتار پویای بعضی از کمپلکس های دو هسته ای ارگانوپلاتین(۲) حاوی لیگاند پل زن بیس(دی فنیل فسفینو)متان A series of binuclear organoplatinum(II) complexes of general formula cis,cis-[R2Pt(μ-SMe2)(μ-dppm)Pt(o-MeC6H4)2], 3a-3d, in which R=Ph, p-MeC6H4, m-MeC6H4 or p-MeOC6H4, were prepared by the reaction of monomeric precursors [Pt(o-MeC6H4)2(dppm)] and cis-[PtR2(SMe2)2]. The binuclear dialkyl analogs in which R=Me (3e) or R2 ={(CH2)4}(3f), were prepared by the reaction of cis-[Pt(o-MeC6H4)2(SMe2)2] and [PtR2(dppm)]. The complexes were fully characterized by multinuclear (1H, 13C, 31P, 195Pt) NMR spectroscopy each as a mixture of syn and anti isomers (depending on the relative orientations of Me substituents on o-tolyl ligands) and each isomer was shown to have a rigid structure. Other binuclear analogs cis,cis-[R2Pt(μ-SMe2)(μ-dppm)PtR\'2], 3g-3j, in which R is a less steric demanding aryl groups m-MeC6H4 or p-MeOC6H4, and R\'=Me or R\'2={(CH2)4}, were prepared by the reaction of cis-[PtR2(SMe2)2] and [PtR\'2(dppm)], and shown to have fluxional structures. [ 6 بهمن 1386 ] | Ligand substitution reaction at a binuclear organoplatinum(II) complex Ligand substitution reaction at a binuclear organoplatinum(II) complex [ 6 بهمن 1386 ] |
