1,721,213 research outputs found
Helvetica Chimica ActaVol. 89 (8)
No full textSi è curata come guest Editor la pubblicazione di un volume della rivista indicata sopra per celebrare il 65° compleanno del Prof. Giambattista Consigli
Osmium(II) Complexes with the Hybrid Ligand 1-(Diphenylphosphino)-2-(2-pyridyl)ethane
No full textOsmium(II) forms with 1-(diphenylphosphino)-2-(2-pyridyl)ethane (ppye) either mononuclear [OsX2-(ppye-P,N)2] 1 or binuclear [(ppye-P,N)2Os(mu-X)2Os(ppye-P,N)2] [PF6]2 2 (X = Cl or Br) derivatives, which have been characterized by UV/VIS, IR, and NMR spectroscopy. The six-co-ordinate 1 reacted with CO yielding either neutral [OsX2(CO)(ppye-P)(ppye-P,N)] or cationic [OsX(CO)(ppye-P,N)2]+ depending on the nature of the solvent. The latter can also be prepared by reaction between 2 and CO in dichloromethane. All the carbonyl derivatives initially formed have the CO group trans to a P atom and can be thermally converted into the isomer having mutually cis P and CO groups. The binuclear complexes 2 dissociate in solution to give five-co-ordinate [OsX(ppye-P,N)2]+ or the solvento species [OsX(solv)(ppye-P,N)2]+ depending on the solvent. With MeCN also the disolvento species [Os(MeCN)2(ppye-P,N)2]2+ is formed, which has been isolated in the solid state as the hexafluorophosphate salt. It undergoes substitution reactions with neutral ligands affording the mono-acetonitrile complexes [Os(MeCN)L(ppye-P,N)2]2+ [L = P(OEt)3, PMe2Ph or pyridine]. Complexes 2 also react with the same ligands giving cationic derivatives of the type [OsX(L)(ppye-P,N)2]+
Civil rights v. social rights nella giurisprudenza della Corte europea dei diritti dell’uomo: c’è un giudice a Strasburgo per i diritti sociali?
No full textIl saggio ricostruisce la giurisprudenza della Corte europea dei diritti dell'uomo sul tema dei diritti sociali, in specie previdenziali, al fine di evidenziarne i profili critici. Il lavoro si sofferma in particolare sulla dialettica tra libertà negative e libertà positive che sembra permeare l'approccio dei giudici di Strasburgo
Octahedral and Trigonal-bipyramidal Complexes of Osmium(II) with 1,2-Bis(dicyclohexylphosphino)ethane. Stereochemistry of Addition Reactions to Five-co-ordinate Osmium(II) Derivatives and to Their Ruthenium(II) Analogues
No full text's Passion for Homogeneous Catalysis, CC Bond Formation, and Stereochemistry
No full textAs we asked our mutual friend Giambattista (Gianni) Consiglio to define himself
during a sort of scientific interview, he simply told us: ‘I’m an organic chemist interested
in the synthesis of small molecules’. This may surprise more than one, considering that
he has dedicated his whole scientific life to the study of transition metals, with a strong
overtone on polymerization. However, the statement sounds perfectly logical if one
considers that the goal of his research was the understanding of mechanistic details
of stereoselective transformations of organic molecules induced by transition-metal
complexes, and that a polymer is nothing else than the repetition of a small molecule.
Indeed, browsing through his more than 150 publications, one central and fundamental
topic emerges as fil rouge, that is, the control of stereochemistry in the C C bond formation
in metal-mediated reactions
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Ordine pubblico europeo e scioglimento dei partiti politici: verso la protezione della democrazia europea?
No full textIl contributo analizza la giurisprudenza della Corte europea dei diritti dell'uomo sullo scioglimento dei partiti politici, cercando di interpretare le scelte ermeneutiche del giudice di Strasburgo alla luce dei due modelli "democrazia aperta" e "democrazia protetta". Nel lavoro vengono evidenziate tuttavia diverse fasi nella giurisprudenza della Corte europea, che sembra ricondurre in un primo momento la Cedu ad un modello di democrazia aperta per poi optare, in alcune decisioni, per un'interpretazione più vicina al secondo modello, quello della democrazia protetta. In alcune sentenze infatti, come nel caso Refah Partisi, i giudici europei sembrano ammettere limiti all'operato delle associazioni politiche quando queste siano riconducibili alla c.d. opposizione anticostituzionale
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