Search results for "Ruth"

Electronic Interactions in Ferrocene‐ and Ruthenocene‐Functionalized Tetraazamacrcocyclic Ligand Complexes of Fe II/III , Co II , Ni II , Cu II and Z…

2005

The syntheses of ferrocene- and ruthenocene-functionalized tetraazamacrocyclic ligands and their corresponding transition metal complexes are described. Reaction of N,N′-bis(2-aminoethyl)-1,3-propanediamine (2,3,2-tet) with 1,1′-diformylferrocene and 1,1′-diformylruthenocene produces the ligands fcmac and rcmac in 81−85% yield. Examination of their CuII, NiII, CoII, ZnII and FeII/III complexes by IR, UV/Vis, EPR and Mossbauer spectroscopy as well as by electrochemical studies suggests electronic communication between the two metal centers of each complex. The molecular structure of [CuII(fcmac)(FBF3)]BF4, determined by X-ray structure analysis, is reported and shows that the distance betwee…

Towards a Library of “Early‐Late” Ti–Ru Bimetallic Complexes

2005

A series of new titanocene phosphanes 3–6 have been prepared by replacing both chloride atoms at the titanium atom of the complexes [TiCl2(η5-C5H5){η5-C5H4(CH2)2PR2}] (1: R = Ph; 2: R = Cy) by sodium fluoride or sodium benzoate in two-phase systems. Treatment of these new metalloligands with the binuclear complex [(p-cymene)RuCl2]2 affords the targeted titanocene difluoride and titanocene dibenzoate bimetallic ruthenium complexes 8–11. The first chiral Ti–Ru bimetallic complex 12 bearing a binaphthyloxy ligand at the titanium centre has been synthesised in this way. In each series, an X-ray crystal structure has been determined. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, …

Resonance Raman Studies of Bis(terpyridine)ruthenium(II) Amino Acid Esters and Diesters

2009

Resonance Raman (rR) spectroscopy in combination with DFT calculations was used to elucidate the nature of the 1metal-to-ligand charge-transfer states (1MLCT) of ester derivatives of homo- and heteroleptic bis(terpyridine)ruthenium(II) complexes [RuII(tpy–COOC2H5)(tpy–R)](PF6)2 with R = NH2 (1a), R = COOC2H5 (1b) and R = NHCOCH3 (1c). The rR spectra provide evidence that the 1MLCT states of 1b and 1c are well described by the expected 1[(“t2g”)5{π*(tpy–COOC2H5)}1] electron configuration, while the 1MLCT state of the donor/acceptor-substituted complex 1a also involves the amine-substituted terpyridine ligand. The excited state of 1a can be described by a 1[{dyz/π(tpy–NH2)}1{π*(tpy–COOC2H5)}1…

Il pensiero linguistico nella Grecia arcaica e classica

2016

Il saggio è un'analisi delle principali idee sul linguaggio nel pensiero greco arcaico e classico (da Omero ad Aristotele) con particolare riferimento alla tematica del rapporto tra verità ed efficacia. The paper is a study of the main ideas on language in ancient Greek thought (from Homer to Aristotle) with a particular focus on the relationship between truth and efficacy.

Introduction to the special issue on Empirical Data and Pragmatic Theory

2008

Tautology as presumptive meaning

2008

Ever since the seminal work of Paul Grice, tautologies such as Business is business have been discussed from a number of angles. While most approaches assume that tautological utterances have to do with the operation of conversational maxims, an integrated analysis is still lacking. This paper makes an attempt at analysing tautologies within the framework of Levinson (2000), who proposes a distinction between three pragmatic levels, namely Indexical Pragmatics, Gricean Pragmatics 1, and Gricean Pragmatics 2. It is shown that observations of Ward and Hirschberg (1991) on the exclusion of alternatives, the claim of Autenrieth (1997) that the second NP in nominal equatives is predicative, and …

Probabilistic and fuzzy logic in clinical diagnosis

2007

In this study I have compared classic and fuzzy logic and their usefulness in clinical diagnosis. The theory of probability is often considered a device to protect the classical two-valued logic from the evidence of its inadequacy to understand and show the complexity of world [1]. This can be true, but it is not possible to discard the theory of probability. I will argue that the problems and the application fields of the theory of probability are very different from those of fuzzy logic. After the introduction on the theoretical bases of fuzzy approach to logic, I have reported some diagnostic argumentations employing fuzzy logic. The state of normality and the state of disease often figh…

Luminescence and structural properties of defects in ion implanted ZnO

2006

ZnO substrates and films were intentionally implanted with rare earth and transition metal ions. The influence of the implantation and subsequent air thermal annealing treatments on the structural and optical properties of ZnO samples were studied by using Rutherford backscattering spectrometry and low temperature photoluminescence techniques. Intraionic Tm-related emission was observed for bulk and ZnO films. Similarly, Eu and Tb-doped ZnO films follow the same trend observed in bulk samples. No intraionic related emission was observed for Eu-doped samples even being the ion in Zn sites and for the Tb-doped samples ion segregation was observed for thermal annealing temperatures above 800 °…

Prospettive dialettiche intorno alla definizione del fenomeno mafioso

2023

Il fenomeno mafioso non nasce certo con l’istituzione della legge n. 646, del 13 settembre 1982, fortemente voluta da Pio La Torre e approvata, non già dopo la sua morte (il 30 aprile del 1982) ma solo all’indomani della strage di via Carini, dove persero la vita il prefetto di Palermo Carlo Alberto Dalla Chiesa, la giovane moglie Emanuela Setti Carraro e l’agente di scorta Domenico Russo. Ma in quella data viene dato un nome e un riconoscimento giuridico – suggellato in uno specifico articolo del codice penale, il 416bis – a un fenomeno criminale risalente nel tempo. Su queste diverse prospettive, sulla tardività del parlamento nel legiferare in questa materia e sulle battaglie dialettiche…

End Capping Ring-Opening Olefin Metathesis Polymerization Polymers with Vinyl Lactones

2008

The selective placement of a functional group at the chain end of a ring-opening metathesis polymer using ruthenium carbene initiators has been a significant limitation. Here we demonstrate a highly effective and facile end-capping technique for ROMP with living ruthenium carbene chain ends using single-turnover olefin metathesis substrates. Vinylene carbonate and 3H-furanone are introduced as functionalization and termination agents for the ruthenium-initiated ring-opening metathesis polymerization. This leads directly to the formation of functional polymer end groups without further chemical transformation steps. Aldehyde and carboxylic acid end groups can be introduced by this new method…