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The solution and solid-state thermochromism of unsymmetrically substituted polysilanes

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Abstract

The thermochromic behavior of a number of dialkyl-substituted polysilanes has been studied in some detail. The formation of a long wavelength-absorbing species in solution at low temperatures is dependent on the polymer structure. Evidence for polymer aggregation has been found in solutions as dilute as 10−5 M (based on the monomer unit). Fluorescence emission studies at very low concentrations (<10−6 M) suggest that single-molecule events can result in the observed thermochromic changes. We have obtained no evidence for the proposed coil-to-rod transition at low temperature by either light or neutron scattering; indeed the scattering studies seem to suggest that the polymer coil dimensions actually shrink slightly prior to the onset of aggregation. It is proposed that the thermochromism observed for many dialkyl polysilanes in solution is initiated by the formation of extended segments within a polymer chain which are long enough to stabilize intra- and intersegmental interactions. In extremely dilute solutions this interaction results in a shrinkage of a single polymer chain; at higher concentrations the interaction results in aggregation.

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Authors and Affiliations

  1. IBM Research Division, Almaden Research Center, 650 Harry Road, 95120-6099, San Jose, California

    R. D. Miller, G. M. Wallraff, M. Baier, P. M. Cotts, P. Shukla & T. P. Russell

  2. Department Scheikunde, Katholieke Universiteit Leuven, 3001, Heverlee-Leuven, Belgium

    F. C. De Schryver & D. Declercq

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  1. R. D. Miller
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  2. G. M. Wallraff
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  3. M. Baier
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  4. P. M. Cotts
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  5. P. Shukla
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  7. F. C. De Schryver
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  8. D. Declercq
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Miller, R.D., Wallraff, G.M., Baier, M. et al. The solution and solid-state thermochromism of unsymmetrically substituted polysilanes. J Inorg Organomet Polym 1, 505–530 (1991). https://doi.org/10.1007/BF00683514

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  • DOI: https://doi.org/10.1007/BF00683514

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