排序方式: 共有70条查询结果,搜索用时 46 毫秒
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Tommaso Carofiglio Euro Solari Carlo Floriani Angiola Chiesi-Villa Corrado Rizzoli 《Polyhedron》1996,15(24):4435-4440
The UV-stabilizer 2-(2′-hydroxy-5′-methylphenyl)benzotriazole (Tinuvin P, LH) has been used as a monoanionic bidentate ligand for complexing oxocations. Displacement of acacH from [VO(acac)2] and [MoO2(acac)2] gave [*VO(acac)2*(μ-L)] (2) and [cis-O2Mo(acac)L] (3) respectively, as crystalline compounds. Their structure has been determined by an X-ray analysis showing the structural changes occurring upon coordination. The UV spectrum of Tinuvin P is significantly affected by complexation. 相似文献
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Domenico Osella Mauro Ravera Carlo Floriani Euro Solari 《Journal of organometallic chemistry》1996,510(1-2):45-50
We describe the redox behaviour in non-aqueous solvents of some cyclopentadienyl(oxo)titanium derivatives. The derivative [Ti4{η5-C5H4(SiMe3)}4(μ-O)6] shows an electrochemically and chemically reversible le reduction process, followed by a multi-electron, chemically complicated reduction at a fairly cathodic potential. On the basis of the overall electrochemical features and the comparison with the redox behaviour of the quasi-planar compound [[Ti{η5-C5H4(SiMe3)}Cl(μ-O)]4] we propose an EECCEE mechanism for the first derivative, where the second electron-transfer induces a cascade of chemical reactions giving rise to irreversible cluster breakdown. The electrochemically induced fragmentation can be viewed as a retrosynthetic pathway. The heterometallic derivative [{Ti(η5-C5H4Me)2(μ2-MoO4)2}2] shows two consecutive reduction processes; the first is chemically reversible, and the second quasi-reversible. The molybdate bridges apparently increase the stability of the electrogenerated anions. However none of these poly-oxo clusters can be considered as good models of electron ‘sinks’. 相似文献
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Tensor and scalar unparticle couplings to matter have been shown to enhance gravitational interactions and provide corrections to the Schwarzschild metric and associated black hole structure. We derive an exact solution to the Einstein equations for vector unparticles, and conclusively demonstrate that these induce Riessner–Nordström (RN)-like solutions where the role of the “charge” is defined by a composite of unparticle phase space parameters. These black holes admit double-horizon structure, although unlike the RN metric these solutions have a minimum inner horizon value. In the extremal limit, the Hawking temperature is shown to vanish. As with the scalar/tensor case, the (outer) horizon is shown via entropy considerations to behave like a fractal surface of spectral dimension dH=2dU. 相似文献
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Olivier C Grote Z Solari E Scopelliti R Severin K 《Chemical communications (Cambridge, England)》2007,(39):4000-4002
The reaction of [(benzene)RuCl(2)](2) with a piperazine-bridged bis(dihydroxypyridine) ligand and LiOH leads to the formation of an expanded helicate, which is able to bind phosphate and acetate in aqueous solution at neutral pH. 相似文献
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Luca Giannini Silvia Dovesi Euro Solari Carlo Floriani Angiola Chiesi-Villa Corrado Rizzoli 《Angewandte Chemie (International ed. in English)》1999,38(6):807-810
The chemically reversible reduction of [(Me)2W(calix)] to the diamagnetic [(Me)2W(calix)Na2] [Eq. (1)], without major changes in the connectivity of the molecule, illustrates the flexibility of the calixarene ligand and stresses its potential as a molecular functional model of heterogeneous oxo surfaces. 相似文献
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Silvia Dovesi Euro Solari Rosario Scopelliti Carlo Floriani 《Angewandte Chemie (International ed. in English)》1999,38(16):2388-2391
The introduction of a heteroatom at the alkylidene carbon atom of calixarene complexes such as 1 results in an organometallic compound that shows properties of both Fischer carbenes and Schrock alkylidenes. Such modified alkylidenes allow access to dimetallic alkylidene complexes. For example, 1 reacts with [CuCOCl] to provide 2 . 相似文献