Excimer Formation in Chain Self-Contact Points

C. S. Renamayor; M. R. Gomez-Anton; B. Calafate; E. B. Mano; D. Radie; L. Gargallo; J. J. Freire; I. F. Pierola

doi:10.1021/ma00011a045

Excimer Formation in Chain Self-Contact Points

C. S. Renamayor
, M. R. Gomez-Anton
, B. Calafate
, E. B. Mano
, D. Radie
, L. Gargallo
, J. J. Freire
, I. F. Pierola

National Distance Education University
Universidade Federal do Rio de Janeiro
Pontificia Universidad Católica de Chile
Complutense University

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

9 Scopus citations

Abstract

Fluorescence spectra of poly(indene) (PIN) and poly(acenaphthylene) (PAN) samples of molecular weight ranging from 1.8 × 10³ to 2.9 × 10⁵ were measured in dilute solution at different temperatures (2,10, 25, and 40 °C). The fluorescence ratio (I_E/I_M) of PIN decreases upon increasing the chain molecular weight and becomes zero for chains of about 500 monomeric units. By contrast, the fluorescence ratio of PAN increases with molecular weight. The temperature dependence is also different for both polymers: in the range of temperatures studied here, PIN is in the high-temperature limit and PAN is in the low-temperature limit. These results are interpreted in terms of the number of chain self-contact points in the equilibrium conformation and also taking into account segmental diffusion. Monte Carlo simulation results of the number of self-contact points in Gaussian chains of different length are also presented.

Original language	English
Pages (from-to)	3328-3333
Number of pages	6
Journal	Macromolecules
Volume	24
Issue number	11
DOIs	https://doi.org/10.1021/ma00011a045
State	Published - 1 May 1991
Externally published	Yes

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10.1021/ma00011a045

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title = "Excimer Formation in Chain Self-Contact Points",

abstract = "Fluorescence spectra of poly(indene) (PIN) and poly(acenaphthylene) (PAN) samples of molecular weight ranging from 1.8 × 103 to 2.9 × 105 were measured in dilute solution at different temperatures (2,10, 25, and 40 °C). The fluorescence ratio (IE/IM) of PIN decreases upon increasing the chain molecular weight and becomes zero for chains of about 500 monomeric units. By contrast, the fluorescence ratio of PAN increases with molecular weight. The temperature dependence is also different for both polymers: in the range of temperatures studied here, PIN is in the high-temperature limit and PAN is in the low-temperature limit. These results are interpreted in terms of the number of chain self-contact points in the equilibrium conformation and also taking into account segmental diffusion. Monte Carlo simulation results of the number of self-contact points in Gaussian chains of different length are also presented.",

author = "Renamayor, \{C. S.\} and Gomez-Anton, \{M. R.\} and B. Calafate and Mano, \{E. B.\} and D. Radie and L. Gargallo and Freire, \{J. J.\} and Pierola, \{I. F.\}",

year = "1991",

month = may,

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doi = "10.1021/ma00011a045",

language = "English",

volume = "24",

pages = "3328--3333",

journal = "Macromolecules",

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TY - JOUR

T1 - Excimer Formation in Chain Self-Contact Points

AU - Renamayor, C. S.

AU - Gomez-Anton, M. R.

AU - Calafate, B.

AU - Mano, E. B.

AU - Radie, D.

AU - Gargallo, L.

AU - Freire, J. J.

AU - Pierola, I. F.

PY - 1991/5/1

Y1 - 1991/5/1

N2 - Fluorescence spectra of poly(indene) (PIN) and poly(acenaphthylene) (PAN) samples of molecular weight ranging from 1.8 × 103 to 2.9 × 105 were measured in dilute solution at different temperatures (2,10, 25, and 40 °C). The fluorescence ratio (IE/IM) of PIN decreases upon increasing the chain molecular weight and becomes zero for chains of about 500 monomeric units. By contrast, the fluorescence ratio of PAN increases with molecular weight. The temperature dependence is also different for both polymers: in the range of temperatures studied here, PIN is in the high-temperature limit and PAN is in the low-temperature limit. These results are interpreted in terms of the number of chain self-contact points in the equilibrium conformation and also taking into account segmental diffusion. Monte Carlo simulation results of the number of self-contact points in Gaussian chains of different length are also presented.

AB - Fluorescence spectra of poly(indene) (PIN) and poly(acenaphthylene) (PAN) samples of molecular weight ranging from 1.8 × 103 to 2.9 × 105 were measured in dilute solution at different temperatures (2,10, 25, and 40 °C). The fluorescence ratio (IE/IM) of PIN decreases upon increasing the chain molecular weight and becomes zero for chains of about 500 monomeric units. By contrast, the fluorescence ratio of PAN increases with molecular weight. The temperature dependence is also different for both polymers: in the range of temperatures studied here, PIN is in the high-temperature limit and PAN is in the low-temperature limit. These results are interpreted in terms of the number of chain self-contact points in the equilibrium conformation and also taking into account segmental diffusion. Monte Carlo simulation results of the number of self-contact points in Gaussian chains of different length are also presented.

UR - https://www.scopus.com/pages/publications/0026151767

U2 - 10.1021/ma00011a045

DO - 10.1021/ma00011a045

M3 - Article

AN - SCOPUS:0026151767

SN - 0024-9297

VL - 24

SP - 3328

EP - 3333

JO - Macromolecules

JF - Macromolecules

IS - 11

ER -

Excimer Formation in Chain Self-Contact Points

Abstract

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