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589 results on '"Catellani M"'

153. Poly(3-alkyl-co-3,4-dialkylthiophene) copolymers: A series of conjugated materials with tunable energy-gap

Author

Catellani, M., Luzzati, S., Chiara Botta, and Stein, P. C.

Abstract

The copolymerization of 3-alkylthiophene aad 3,4-dialkylthiophene units in well defined ratios leads to materials in which it is possible to modulate continuously the electronic properties sucha s the conjugationl ength and the energy-gapT. he solublem aterialsh ave optical properlies depending on tle chemical composition of the chain. A macromolecular and optical characterisatiohna sb eenp erformedo n two copolyner series

Published
1996

154. Optical properties of poly[(3-pentyl-5-oxyazobenzene)thiophene]

Author

Luzzati, S, Viera, W, and Catellani, M

Abstract

The extensive spectroscopical characterization here reporteù indicates tlat the prese,nce ofthe azobenzene chromophore in the side chain is not substantially affecting the optical properties of the conjugated backbone. The long lived photoexcited species leading to the photoinduced absorption spectial features are intrinsic to the thiophene backbone, even when tle azobe,nzene chromophore is photoexcited by W light. Ifpe increase of photoconductivity [2] is a general feature of polyalkylthiophene containing azíbenzene ohromophores in the side chain, our results bring oovel data for understanding the mechanism of the enhanoement of photoconduotivity. Two different mechanisms may explain this enhancement : an increase of mobility due to azobenzenes actitrg as hopping sites for the thiophene photocarriers[2]; or the prese,lroe of azoberzene may favour ttre formation of charge photocarriers of the thiophene backbone. In the second case, like in polyhexylthiophene-C6g composites [13], an increase oft]e photoinduced activity ofthe thiophene backbone should be expected. Our data bring support to île increase of charge mobility as the inorease ofthe photoinduced signal is not detected.

Published
1996

173. Electrochemical synthesis of poly(dithienothiophene)

Author

Siekirski M., Plocharski J., Catellani M., and Destri S.

Abstract

Electrochemical characterization of the preparation procedure and the properties of poly(dithieno[3,4-b: 3?,4? - d] thiophene) is performed. This new conjugated system has the unique property of high transparency in the conductive state. By means of cyclic voltammetry and impedance spectroscopy it was found that oxidation of the monomer starts at 0.95 V vs Ag/AgCl and the created polymer easily deteriorates at potentials exceeding 1.1 V. The overoxidation results in decay of electroactivity and conductivity.

Published
1992

176. LB films of promising materials for electrooptics

Author

Bajo G., Bolognesi A., Catellani M., Destri S., and Porzio W.

Abstract

Poly(3-alkylthiophenes) and poly(3-alkylthiophene)vinylenes can be filmed in mixture with arachidic acid using Langmuir-BLodgett techniques. Comparative XR diffraction and UV-vis. studies were carried out in order to determine the quality of the deposition and the chain organization in L.B. films.

Published
1991

178. MASS-SPECTROMETRIC SYNTHESIS .5. THE GAS-PHASE ION-MOLECULE DIMERIZATION OF SOME SULFUR-CONTAINING HETEROCYCLES

Author

AUDISIO, G, CATELLANI, M, DESTRI, S, PELLI, B, and TRALDI, P

Abstract

The gas-phase, ion-molecule reactions occurring in the ion source of a mass spectrometer between differently substituted thiazoles, employed as starting compounds for synthesis of polymers exhibiting semiconducting properties, have been studied in detail. The structural characterization of the dimeric moieties so obtained has been carried out by exact mass measurements, linked scans for metastable analysis and collisional spectroscopy.

Published
1990

180. CHARACTERIZATION OF CONDUCTING POLY(DITHIENO(3,4-B-3',4'-D)THIOPHENE)

Author

BOLOGNESI, A, CATELLANI, M, DESTRI, S, TALIANI, C, and ZAMBONI, R

Abstract

With the aim of synthesizing conducting conjugated polymers with suitable spectral windows of transparency, we have designed the monomer molecule: dithieno(3,4-b:3',4"-d)thiophene (DDT').

Published
1990

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