Langmuir-Blodgett films of a new pyridinium-dicyanomethanide dye and their potential optical applications

Riccardo Ricceri; Alessandro Abbotto; Antonio Facchetti; Giorgio A. Pagani; Gabriella Gabrielli

doi:10.1021/la962091c

Langmuir-Blodgett films of a new pyridinium-dicyanomethanide dye and their potential optical applications

Riccardo Ricceri, Alessandro Abbotto, Antonio Facchetti, Giorgio A. Pagani^*, Gabriella Gabrielli

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

We report on Langmuir-Blodgett (LB) characterization of 4-[5-(dicyanomethanidyl)thien-2-yl]-N-cetylpyridinium (C₁₆H₃₃-PDCNT). Surface pressure-area isotherms of monolayers were investigated at T = 291 K. LB films of Y- and Z-type were characterized by means of UV-vis and FTIR spectroscopies. The compound is photobleachable and undergoes a change in molecular structure in monolayer and in solution. The molecule strongly absorbs in the visible region due to a charge transfer band both in homogeneous solution and LB films. Depending upon dipping conditions, a sharp absorption band appears at about 422 nm that could be attributed to molecular aggregates, probably of H-type. Both the 422 nm band and the broad charge transfer band at longer wavelength are photobleachable, and the former could have potential applications for optical data storage. The molecule seems to possess a large second-order hyperpolanzability, and non-centroeymmetric Z-type LB films could have promising nonlinear optical properties.

Original language	English (US)
Pages (from-to)	3434-3437
Number of pages	4
Journal	Langmuir
Volume	13
Issue number	13
DOIs	https://doi.org/10.1021/la962091c
State	Published - Jun 25 1997

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Langmuir-Blodgett films of a new pyridinium-dicyanomethanide dye and their potential optical applications",

abstract = "We report on Langmuir-Blodgett (LB) characterization of 4-[5-(dicyanomethanidyl)thien-2-yl]-N-cetylpyridinium (C16H33-PDCNT). Surface pressure-area isotherms of monolayers were investigated at T = 291 K. LB films of Y- and Z-type were characterized by means of UV-vis and FTIR spectroscopies. The compound is photobleachable and undergoes a change in molecular structure in monolayer and in solution. The molecule strongly absorbs in the visible region due to a charge transfer band both in homogeneous solution and LB films. Depending upon dipping conditions, a sharp absorption band appears at about 422 nm that could be attributed to molecular aggregates, probably of H-type. Both the 422 nm band and the broad charge transfer band at longer wavelength are photobleachable, and the former could have potential applications for optical data storage. The molecule seems to possess a large second-order hyperpolanzability, and non-centroeymmetric Z-type LB films could have promising nonlinear optical properties.",

author = "Riccardo Ricceri and Alessandro Abbotto and Antonio Facchetti and Pagani, {Giorgio A.} and Gabriella Gabrielli",

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AU - Ricceri, Riccardo

AU - Abbotto, Alessandro

AU - Facchetti, Antonio

AU - Pagani, Giorgio A.

AU - Gabrielli, Gabriella

PY - 1997/6/25

Y1 - 1997/6/25

N2 - We report on Langmuir-Blodgett (LB) characterization of 4-[5-(dicyanomethanidyl)thien-2-yl]-N-cetylpyridinium (C16H33-PDCNT). Surface pressure-area isotherms of monolayers were investigated at T = 291 K. LB films of Y- and Z-type were characterized by means of UV-vis and FTIR spectroscopies. The compound is photobleachable and undergoes a change in molecular structure in monolayer and in solution. The molecule strongly absorbs in the visible region due to a charge transfer band both in homogeneous solution and LB films. Depending upon dipping conditions, a sharp absorption band appears at about 422 nm that could be attributed to molecular aggregates, probably of H-type. Both the 422 nm band and the broad charge transfer band at longer wavelength are photobleachable, and the former could have potential applications for optical data storage. The molecule seems to possess a large second-order hyperpolanzability, and non-centroeymmetric Z-type LB films could have promising nonlinear optical properties.

AB - We report on Langmuir-Blodgett (LB) characterization of 4-[5-(dicyanomethanidyl)thien-2-yl]-N-cetylpyridinium (C16H33-PDCNT). Surface pressure-area isotherms of monolayers were investigated at T = 291 K. LB films of Y- and Z-type were characterized by means of UV-vis and FTIR spectroscopies. The compound is photobleachable and undergoes a change in molecular structure in monolayer and in solution. The molecule strongly absorbs in the visible region due to a charge transfer band both in homogeneous solution and LB films. Depending upon dipping conditions, a sharp absorption band appears at about 422 nm that could be attributed to molecular aggregates, probably of H-type. Both the 422 nm band and the broad charge transfer band at longer wavelength are photobleachable, and the former could have potential applications for optical data storage. The molecule seems to possess a large second-order hyperpolanzability, and non-centroeymmetric Z-type LB films could have promising nonlinear optical properties.

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Langmuir-Blodgett films of a new pyridinium-dicyanomethanide dye and their potential optical applications

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