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Nel presente lavoro di tesi è stato studiato l’attacco da parte della dietilammina su composti di coordinazione di platino(II) contenenti un legante insaturo (CO, acetonitrile, propionitrile) e la trifenilfosfina come legante ancillare.... more
Nel presente lavoro di tesi è stato studiato l’attacco da parte della dietilammina su composti di coordinazione di platino(II) contenenti un legante insaturo (CO, acetonitrile, propionitrile) e la trifenilfosfina come legante ancillare. Questo studio è stato preceduto dalla messa a punto di nuove efficienti preparazioni dei complessi di partenza e da un controllo di alcuni aspetti della loro reattività. Sono state inoltre condotte prove preliminari sulla reattività di composti di platino(II) contenenti due leganti insaturi (CO, propionitrile) con la dietilammina. I composti ottenuti sono stati indagati mediante tecniche spettroscopiche IR e 1H, 13C, 195Pt e, ove possibile, 31P NMR
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An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Research Interests: Algorithms, Organic Chemistry, Quantum Theory, Crystallization, Macromolecular X-Ray Crystallography, and 9 moreTransition-Metal Oxides, Computer Simulation, Hydrogen Bonding, Liquid Chromatography / Electrospray Ionization Mass Spectrometry, Molecules, Crystal Structures, Molecular Conformation, DFT Calculations, and Alkalies
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Azahelicenes possess an extended conjugated π system which can endow their complexes with useful optical properties, including intense absorption bands in the visible region of the spectrum and photoluminescence. As such, azahelicene... more
Azahelicenes possess an extended conjugated π system which can endow their complexes with useful optical properties, including intense absorption bands in the visible region of the spectrum and photoluminescence. As such, azahelicene complexes may be regarded as promising functional components of light-harvesting and energy transfer systems. For this reason, mono- and diaza[5]helicenes were approached on one hand through gas-phase quanto-mechanic calculations aimed to determine the availability of the nitrogen(s) lone pair and on the other side through X-ray diffraction of their crystals, with the purpose to shed light on the intermolecular forces driving the formation of well-ordered structures in the solid state. Furthermore, N-alkylation of some of these molecules was realized, in order to relate the ease of formation of quaternary salts with the results obtained by density functional calculations. These results provide a rationale for designing new azahelicene-transition metal c...
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The synthesis and structural characterization of azahelicene platinum complexes obtained from cis-PtCl2(NCEt)(PPh3) and from ligands that differ in terms of both the position of the nitrogen atom and the number of fused rings are... more
The synthesis and structural characterization of azahelicene platinum complexes obtained from cis-PtCl2(NCEt)(PPh3) and from ligands that differ in terms of both the position of the nitrogen atom and the number of fused rings are reported. These square-planar complexes of the general formula PtCl2(nHm)(PPh3) (n = 4, 5; m = 5, 6) display mainly a cis configuration. However, by X-ray crystallographic analysis, we show that for both PtCl2(4H6)(PPh3) and PtCl2(5H6)(PPh3) there is chirality control of the cis/trans stereochemistry. Indeed, starting from a racemic mixture of aza[6]helicene, platinum complexes with a cis configuration are invariably obtained, and the more thermodynamically stable trans isomers are formed when using enantiopure ligands. We further corroborated these results by NMR analysis in solution.
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ABSTRACT Four different hexahelicenes, 5-aza-hexahelicene (1), hexahelicene (2), 2-methyl-hexahelicene (3), and 2-bromo-hexahelicene (4), were prepared and their enantiomers, which are stable at r.t., were separated. Vibrational circular... more
ABSTRACT Four different hexahelicenes, 5-aza-hexahelicene (1), hexahelicene (2), 2-methyl-hexahelicene (3), and 2-bromo-hexahelicene (4), were prepared and their enantiomers, which are stable at r.t., were separated. Vibrational circular dichroism (VCD) spectra were measured for compound 1; for all the compounds, electronic circular dichroism (ECD) and circularly polarized luminescence (CPL) spectra were recorded. Each type of experimental spectrum was compared with the corresponding theoretical spectrum, determined via Density Functional Theory (DFT). Following the recent papers by Nakai et al., this comparison allowed to identify some features related to the helicity and some other features typical of the substituent groups on the helical backbone. The Raman spectrum of compound 1 is also examined from this point of view.