488 research outputs found
I2-adducts of thione containing-ligands: possible industrial and bio-medical applications
No full textAn alternative chemistry for the recovery of precious metals from waste industrial materials
No full textExploiting the potential of adaptive building components by means of innovative control strategies
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Charge-Transfer (C.-T.) adducts and Related compounds
No full textReactions of di-halogens (I2, Br2) and inter-halogens (IBr, ICl) with organic molecules containing Group 16-donor atoms (LE; L = organic framework, E = S, Se, Te) have been the subject of renewed interest in the past few years both for their intrinsic interest and for their implications in different..
Halogen-Chalcogen X-E (X = F, Cl, Br, I; E = S, Se, Te) Chemistry: Charge-Transfer (C.-T.) adducts and related compounds
No full textF. Cristiani, F. Demartin, F. A. Devillanova, F. Isaia, V. Lippolis, G. Verani Spectroscopic studies of charge-transfer complexes of 1,4,7-trithiacyclononane with diiodine.
No full text1,4,7-Trithiacyclononane ([9]aneS3) reacts with molecular diiodine in CH2Cl2 to form a 1:1 adduct. The formation constant and the thermodynamic parameters of this adduct have been determined by UV-visible spectra of several solutions at the temperatures of 15, 20, 25, 30, and 35-degrees-C. The C-13 NMR spectra show that adducts with higher ligand/diiodine molar ratios are formed. Two neutral charge-transfer molecular compounds having formula 2[9]aneS3 . 4I2 (I) and [9]aneS3 . 3I2 . (II) have been obtained as crystals. The crystals of I are triclinic (a = 8.498(2) angstrom, b = 13.984(4) angstrom, c = 14.898(6) angstrom, alpha = 65.57(2)degrees, beta = 89.19(2)degrees, gamma = 81.26(2)degrees, Z = 2, space group P1BAR; R = 0.025) and contain units formed by two [9]aneS3 molecules connected by a diiodine molecule; one [9]aneS3 binds two other diiodine molecules, while the second binds only one other diiodine molecule. The crystals of II are monoclinic (a = 13.810(2) angstrom, b = 9.829(4) angstrom, c = 16.198(6) angstrom, beta = 113.41(2)degrees, Z = 4, space group P2(1)/c; R = 0.019) and contain molecules of [9]aneS3 binding three diiodine molecules. FT-Raman spectra in the characteristic nu(I-I) region, carried out on the solid adducts, are discussed in comparison with the structural parameters
Francesco D’Ovidio
No full textIl contributo ricostruisce il profilo del Presidente della Classe di Scienze morali dell'Accademia dei Lincei Francesco D'Ovidio, carica che egli ricoprì dal 1916 al 1923. Glottologo, filologo e critico letterario, D'Ovidio ebbe rapporti con l'"Archivio glottologico italiano", Graziadio Isaia Ascoli, Alessandro Manzoni e Francesco De Sanctis, relazioni tutte che l'articolo analizza, ricostruendo l'attività d'insegnamento, la posizione politica, il ruolo nella storia dell'Università italiana e l'attività di gestione dell'Accademia dei Lincei di d'Ovidio
Copper(I) complexes from CuX2(X = NO3, BF4, 1 2SO4) and some heterocyclic ligands containing the thioamido group
No full textComplexes of copper(I) CuLnX(n = 2, 3; X = NO3, BF4 1 2SO4) have been obtained by reacting the corresponding copper(II) salts with the following ligands HNCH2·CH2X·C = S (where X = NH, NMe, NEt, S, O and CH2). All the ligands bind the metal through the thioketonic sulphur, as shown by the IR spectroscopy. The copper(I) seems always to realize a trigonal planar geometry both with three molecules of ligands and with two ligands and
1H bridging and terminal hydride T1 values. Comments on classical vs non classical hydride identification using T1 criteria.
No full textHydride 1H T1 values are reported for a selected series of ruthenium, iridium and platinum complexes. These T1 values range from 6.9 to 0.05 s with the shortest value, 0.05 s, assigned to a complex containing both hydride and coordinated molecular hydrogen, i.e. “M(H2)”. There are nuclear Overhauser enhancements arising both from protons on coordinated ligands and other hydride ligands. It is suggested that the molecular weight of the complex and the measurement conditions can be important factors for T1
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