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Your search keyword '"G. Longoni"' showing total 24 results
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24 results on '"G. Longoni"'

17. ChemInform Abstract: A STRUCTURAL AND SPECTROSCOPIC CHARACTERIZATION OF BIS(μ-DIPHENYLPHOSPHIDO)-μ-HYDRIDOTRIS(TRIPHENYLPHOSPHINE)TRIPLATINUM TETRAFLUOROBORATE DICHLOROMETHANE (1/2)

Author

G. Longoni, Brian T. Heaton, Pier Luigi Bellon, Alessandro Ceriotti, and Francesco Demartin

Subjects
chemistry.chemical_compound, Tetrafluoroborate, chemistry, Polymer chemistry, Organic chemistry, General Medicine, Triphenylphosphine, Dichloromethane, Characterization (materials science)
Published
1982

23. Synthesis, Structures and Electrochemistry of New Carbonylnickel Octacarbide Clusters: The Distorting Action of Carbide Atoms in the Growth of Ni Cages and the First Example of the Inclusion of a Carbon Atom within a (Distorted) Ni Octahedral Cage

Author

Giuliano Longoni, Cristina Femoni, Alessandro Bernardi, Serena Fedi, Maria Carmela Iapalucci, Stefano Zacchini, Piero Zanello, A. Bernardi, C. Femoni, M. C. Iapalucci, G. Longoni, S. Zacchini, S. Fedi, and P. Zanello

Subjects
Carbon atom, chemistry.chemical_element, Electrochemistry, Redox, Carbide, Inorganic Chemistry, Metal, Crystallography, Nickel, Octahedron, chemistry, visual_art, visual_art.visual_art_medium, Cage
Abstract

The reaction of [Ni 10 C 2 (CO) 15 ] 2- in thf with a large excess of CdCl 2 ·2.5H 2 O (8-15 equiv.) resulted in the formation of the new carbonyl octacarbide clusters [H 5-n Ni 36 C 8 (CO) 36 -(Cd 2 Cl 3 )] n- (n = 3-5), which undergo partial CO replacement to give [Ni 36-y C 8 (CO) 34-y (MeCN) 3 (Cd 2 Cl 3 )] 3- (y = 0-2) after a prolonged time in MeCN. Treatment of the former with an excess of NaOH afforded the larger [H 7-n Ni 42+y C 8 (CO) 44+y -(CdCl)] n- (n = 6, 7 ; y = 0, 1) octacarbides. Their structures (as well as those of the analogous Br-containing clusters) have been fully elucidated by single-crystal X-ray analysis of their [Me 4 N] 5 [Ni 36 C 8 (CO) 36 (Cd 2 Cl 3 )]·(7-2y)MeCN·yC 6 H 14 (y = 0.40), [Me 4 N] 3 [Ni 36-y C 8 (CO) 34-y (MeCN) 3 (Cd 2 Cl 3 )]·5MeCN (y = 0.61), [Me 4 N] 7 [Ni 42+y C 8 (CO) 44+y (CdCl)]·(5-y)MeCN (y = 0.19) and [Me 4 N] 6 [HNi 42+y C 8 (CO) 44+y (CdBr)]·(6-y)MeCN (y = 0.19) salts, which feature highly distorted metal cages (due to the inclusion of several carbide atoms), and the presence of partially vacant capping Ni(CO) fragments. This aspect, together with the fact that all these species undergo several protonation-deprotonation equilibria in solution as well as reversible redox processes under electrochemical control, indicates that a detailed description of molecular species containing a few dozen metal atoms might be sometimes rather troublesome and non-trivial. A complete elucidation of these systems can be achieved only by combining structural, chemical, spectroscopic, electrochemical and spectroelectrochemical studies.

Published
2010

24. In vivo evidence of hippocampal dentate gyrus expansion in multiple sclerosis.

Author

Rocca MA, Longoni G, Pagani E, Boffa G, Colombo B, Rodegher M, Martino G, Falini A, Comi G, and Filippi M

Subjects
Adult, Aged, Cognition Disorders etiology, Cognition Disorders physiopathology, Female, Humans, Male, Middle Aged, Multiple Sclerosis, Chronic Progressive complications, Multiple Sclerosis, Chronic Progressive physiopathology, Multiple Sclerosis, Relapsing-Remitting complications, Multiple Sclerosis, Relapsing-Remitting physiopathology, Young Adult, Cognition Disorders pathology, Dentate Gyrus pathology, Magnetic Resonance Imaging methods, Multiple Sclerosis, Chronic Progressive pathology, Multiple Sclerosis, Relapsing-Remitting pathology
Abstract

Using MR-based radial mapping, we assessed morphological alterations of the hippocampal dentate gyrus (DG) in patients with relapse-onset multiple sclerosis (MS). We analyzed different stages of the disease and the association of DG alterations with hippocampal-related cognitive functions. Using high-resolution morphological imaging, hippocampal radial mapping analysis was performed in 28 relapsing-remitting (RR), 34 secondary progressive, and 26 benign MS patients and 28 healthy controls (HC). Between-groups differences of DG radial distance (from surface points to the central core of the hippocampus) and correlations with clinical, neuropsychological, and radiological measures were evaluated using surface-based mesh modeling. Compared with HC, all MS clinical phenotypes revealed a larger radial distance of the DG, which was more marked on the left side. Radial distance enlargement was more pronounced in RRMS patients compared with the other disease clinical phenotypes and was inversely correlated to disease duration. Radial distance enlargement was correlated with higher T2 lesion volume and a better cognitive performance in RRMS and with a poor cognitive performance in secondary progressive and benign MS patients. Surface expansion of the DG might represent an inflammation-induced neurogenic (reactive) process of the subgranular zone of the hippocampus primarily aimed at rescuing the functional competence of hippocampal circuitry., (© 2015 Wiley Periodicals, Inc.)

Published
2015
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