The crystal and molecular structure of the bis(4-N, N1-dimethylaminopyridine) solvate of disalicylicacidatobis(nitrotodioxouranium)(VI)

The structure of the title compound [(C7H4NO8U)(C7H11N2)]2 has been determined by Patterson and Fourier methods from single crystal X-ray diffraction data collected on a four-circle diffractometer. Full-matrix least-squares refinement yielded a final conventional R of 0.041 for 2189 reflections. The complex crystallizes in the space group P with a = 11.004(5), b = 9.981(5), c = 9.928(5) Å, α = 119.6(3), β = 107.7(3), γ = 81.9(3)°, Dm = 2.17, Dc = 2.173g cm−3. The structure is dimeric. The uranium atoms are eight-coordinate and are bridged via centrosymmetrically related carboxylic oxygen atoms. The nitrate group is bidentate and the average U---O (ligand) distance is 2.463 Å. Hydrogen bonding of the type N---HO links two dimethyl-aminopyridine molecules to the dimer

The structure of aliphatic amine adducts of uranyl acetylacetonate. III. Dioxobis(2,4-pentanedionato)mono (2-N-isopropylaminopentan-4-one)uranium(VI)

Introduction: In two earlier structural determinations of compounds of this type we have shown that the conformation of the adduct moiety is dependent on the formation of intramolecular N-H...0 hydrogen bonds (part I: Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976; part II: Nassimbeni, Orpen, Pauptit, Rodgers & Haigh, 1977). We have carried out the present analysis to study the conformational effects on the ligand brought about by the steric influence of an isopropyl substituent at N

The crystal structure of caesium permanganate by x-ray diffraction

The crystal structure of caesium permanganate has been determined. CsMn0₄ crystallises in the orthorhombic space group Pnma. There are four molecules per unit cell with a = 10.0692 Å, b = 5.8080 Å, c = 7.9470 Å. The structure was determined by Fourier syntheses on the (010) and (001) projections and refined by two-dimensional difference syntheses. The structure is similar to that of KMn0₄. The manganese is surrounded by four oxygen atoms at an average distance of 1.629 Å arranged in a slightly distorted tetrahedron. The caesium is surrounded by eight manganese atoms at an average distance of 4.381 Å

The structure of aliphatic amine adducts of uranyl acetylacetonate. II. Dioxobis(2,4-pentanedionato)mono (2-N,N-dimethylaminopentan-4-one)uranium(VI)

Introduction: In a previous analysis of a compound of this type, we have established that the adduct molecule is bonded through O and that the geometry about U is pentagonal bipyramidal (Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976). We have carried out the present analysis to study the conformational effects on the ligand brought about by substitution at N

The structure of aliphatic amine adducts of uranyl acetylacetonate. IV. Dioxobis(2,4-pentanedionato) mono(2-aminopentan-4-one)uranium(VI)

Introduction: We have shown in three earlier determinations of aliphatic amine adducts of U02(AA)2 (part I: Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976; part II: Nassimbeni, Orpen, Pauptit, Rodgers & Haigh, 1977; part III: Rodgers, Nassimbeni & Haigh, 1977) that the conformation of the adduct is dependent on its ability to form hydrogen bonds. The present compound has two H atoms available for hydrogen bonding and may be regarded as the parent of the series

The structure of aliphatic amine adducts of uranyl acetylacetonate. I. Dioxobis(2,4-pentanedionato)mono (2-N-methylaminopentan-4-one)uranium(VI)

Crystals of the title compound are monoclinic with a= 8.314 (5), b= 22.723 (9), c= 12.589 (6) A, /3= 123.0 (2t, Z=4, space group P2dc. The structure was determined by Patterson and Fourier methods and refined by full-matrix least squares to a final R of 0.030 for 2043 independent reflexions. The U atom has pentagonal bipyramidal coordination and the N-methylacetylacetoneamine is bonded to U via O. There are two intramolecular N-H. . .0 hydrogen bonds which govern the geometry of the adduct molecule

Il back-reshoring manifatturiero nei processi di internazionalizzazione: inquadramento teorico ed evidenze empiriche

Obiettivo del paper. Il paper si prefigge di inquadrare il fenomeno del back-reshoring manifatturiero - ovvero la rilocalizzazione nel paese di origine delle attivit\ue0 produttive precedentemente delocalizzate all\u2019estero -nell\u2019ambito dei processi di internazionalizzazione dell\u2019impresa. Metodologia. L\u2019approccio metodologico utilizzato \ue8 di tipo esplorativo, data la mancanza di una letteratura consolidata specifica. In particolare si \ue8 fatto ricorso a dati secondari raccolti in maniera originale attraverso una pluralit\ue0 di fonti. Risultati. \uc8 stata identificata una definizione operativa di back-reshoring inserendo tale fenomeno in un framework teorico rappresentativo del processo evolutivo di internazionalizzazione dell\u2019impresa. Sulla base delle evidenze empiriche, sono state proposte delle direttrici di sviluppo per future attivit\ue0 di ricerca. Implicazioni manageriali. Sono state evidenziate le conseguenze che il fenomeno pu\uf2 avere sulla competitivit\ue0 e le performance economica delle imprese che adottano strategie di reshoring. Originalit\ue0 e limiti della ricerca. Il principale elemento di originalit\ue0 del lavoro \ue8 rappresentato dall\u2019utilizzo di una metodologia di ricerca esplorativa che ha coniugato l\u2019analisi della letteratura di International business e quella di Supply chain management con l\u2019analisi di evidenze empiriche raccolte in maniera originaria. Le scelte metodologiche effettuate rappresentano anche il principale limite del contributo, le cui conclusioni non sono generalizzabili ma costituiscono la base per ulteriori approfondimenti del dibattito scientifico, per i quali si sono identificate delle specifiche direttrici