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Luigi Angiolini Daniele Caretti Carlo Carlini Angelina Altomare Roberto Solaro 《Journal of polymer science. Part A, Polymer chemistry》1994,32(15):2849-2857
Photochromic behavior and photoisomerization kinetics of optically active copolymers of trans-N-(4-azobenzene) maleimide (ABM) with (?) -menthyl vinyl ether (MtVE) and (+) (S) -2-methylbutyl vinyl ether were studied by UV spectroscopy under irradiation at 348 nm. The resulting data have been compared with those of the corresponding copolymers containing also trans-N-(4-azobenzene) maleamic acid co-units as well as of low molecular weight model compounds. The photoresponsive behavior has been also investigated by circular dichroism measurements at various extents of photoisomerization. The results are discussed in terms of structural requirements of the macromolecules. © 1994 John Wiley & Sons, Inc. 相似文献
67.
Niculescu I Armstrong CS Arrington J Assamagan KA Baker OK Beck DH Bochna CW Carlini RD Cha J Cothran C Day DB Dunne JA Dutta D Ent R Filippone BW Frolov VV Gao H Geesaman DF Gueye PL Hinton W Holt RJ Jackson HE Keppel CE Koltenuk DM Mack DJ Meekins DG 《Physical review letters》2000,85(6):1186-1189
A newly obtained sample of inclusive electron-nucleon scattering data has been analyzed for precision tests of quark-hadron duality. The data are in the nucleon resonance region, and span the range 0. 3相似文献
68.
Abbott D Ahmidouch A Anklin H Arvieux J Ball J Beedoe S Beise EJ Bimbot L Boeglin W Breuer H Brindza P Carlini R Chant NS Danagoulian S Dow K Ducret J Dunne J Ewell L Eyraud L Furget C Garcon M Gilman R Glashausser C Gueye P Gustafsson K Hafidi K 《Physical review letters》2000,84(22):5053-5057
Tensor polarization observables ( t(20), t(21), and t(22)) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c)(2). The experiment was performed at the Jefferson Laboratory in Hall C using the electron High Momentum Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to much larger Q2 the deuteron charge form factors G(C) and G(Q). They are in good agreement with relativistic calculations and disagree with perturbative QCD predictions. 相似文献
69.
Federica Benvenuti Carlo Carlini Mario Marchionna Anna Maria Raspolli Galletti Glauco Sbrana 《先进技术聚合物》1999,10(9):554-560
Brominated and chloromethylated styrene–divinylbenzene resins were used for the synthesis of polymer‐bound dithio‐β‐diketones, obtained by anchoring the chelate ligand through the central position. The heterogenized dithio‐β‐diketone ligand was subsequently reacted either as sodium salt with a Ni(II) phosphino derivative or directly with a Ni(0) complex in the presence of a free phosphine and activated in situ with an aluminum co‐catalyst for the selective dimerization of propylene to 2,3‐dimethylbutenes. The hetetogenized catalysts so obtained showed, particulary when prepared starting from chloromethylated styrene/divinylbenzene resins, very high activity and selectivity towards 2,3‐dimethylbutenes. Moreover, the above catalysts, at least under the adopted reaction conditions, did not display any appreciable metal leaching during the catalytic cycle, thus working as really heterogeneous systems. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
70.
Luigi Angiolini Daniele Caretti Carlo Carlini Elisabetta Salatelli 《Journal of polymer science. Part A, Polymer chemistry》1996,34(14):2999-3013
Optically active poly(γ-ketosulfide)s having the asymmetric centers disposed along the main chain have been prepared by step polyaddition of 1,3-dimercaptobenzene to 4,4-dimethyl-2,5-cyclohexadiene-1-one, or to trans, trans-2,5-heptadiene-3-one, in the presence of catalytic amounts of chiral amines. The extent of asymmetric induction on the resulting polymeric product is found to be higher when the alicyclic ketone reagent is employed and is enhanced by lowering the catalyst concentration. The comparison of stereochemical features and chiroptical properties of appropriate low molecular weight analogues with those of the polymeric derivatives indicates that a comparable asymmetric induction occurs in polymers and model compounds, and that the former systems do not display appreciable evidence of ordered secondary structures, in agreement with a low stereoregularity degree along the macromolecular backbone. © 1996 John Wiley & Sons, Inc. 相似文献