Fluorescence spectroscopic studies of solvent- and temperature-induced conformational transition in segmented poly[2-methoxy-5-(2′-ethylhexyl) oxy-1,4-phenylenevinylene] (MEHPPV)

Journal of Physical Chemistry B

Volumn 108, Issue 39, 2004, Pages 14933-14941

  Padmanaban, G ^a   Ramakrishnan, S ^a  

^a INDIAN INSTITUTE OF SCIENCE   (India)

Author keywords

[No Author keywords available]

Indexed keywords

CHROMOPHORES; COMPOSITION; CONFORMATIONS; DERIVATIVES; ENERGY TRANSFER; FLUORESCENCE; GROUND STATE; MATHEMATICAL MODELS; SOLVENTS; SPECTROSCOPIC ANALYSIS;

CONFORMATIONAL CHANGES; HYDRODYNAMIC VOLUME; MOLECULAR CONJUGATION LENGTHS; SPECTRAL EVOLUTION;

ORGANIC POLYMERS;

EID: 6344270300     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp048994t     Document Type: Article

References (49)

1. (a) Burroughes, J. H.; Bradley, D. D. C.; Brown, A. R.; Marks, H. N.; Mackay, K.; Friend, R. H.; Burns, P. L.; Holmes, A. B. Nature 1990, 347, 539.
2. (b) Braun, D.; Heeger, A. J. Appl. Phys. Lett. 1991, 58, 1982.
3. (c) Kraft, A.; Grimsdale, A. C.; Holmes, A. B. Angew. Chem., Int. Ed. 1998, 37, 402.
4. (d) Friend, R. H.; Gymer, R. W.; Holmes, A. B.; Burroughes, J. H.; Marks, R. N.; Taliani, C.; Bradley, D. D. C.; dos Santos, D. A.; Bredas, J. L.; Logdlund, M.; Salaneck, W. R. Nature 1999, 397, 121.
5. (e) Tessler, N.; Denton, G. J.; Friend, R. H. Nature 1995, 382, 695.
6. (f) Granstrom, M.; Petritsch, K.; Arias, A. C.; Lux, A.; Andersson, M. R.; Friend, R. H. Nature 1998, 395, 257.
7. (g) Pei, Q.; Yu, G.; Zhang, C.; Yang, Y.; Heeger, A. J. Science 1995, 269, 1086.
8. (h) Sirringhaus, H.; Tessler, N.; Friend, R. H. Science 1998, 280, 1741.
9. (i) Halls, J. J. M.; Walsh, C. A.; Greenham, N. C.; Holmes, A. B.; Marsegila, E. A.; Friend, R. H.; Moratti, S. C. Nature 1995, 376, 498.
10. (j) Kohler, A.; dos Santos, D. A.; Beljonne, D.; Shuai, Z.; Bredas, J. L.; Holmes, A. B.; Kraus, A.; Mullen, K.; Friend, R. H. Nature 1998, 392, 903.
11. Hide, F.; Diaz-Garcia; Schwartz, B. J.; Andersson, M. R.; Pai, Q.; Heeger, A. J. Science 1996, 273, 1833.
12. (a) Nguyen, T.-Q.; Doan, V.; Schwartz, B. J. J. Chem. Phys. 1999, 110, 4068.
13. (b) Nguyen, T.-Q.; Martini, I.; Liu, J.; Schwartz, B. J. J. Phys. Chem. B 2000, 104, 237.
14. (c) Nguyen, T.-Q.; Kwong, R. C.; Thompson, M. E.; Schwartz, B. J. Appl. Phys. Lett. 2000, 76, 2454.
15. (d) Nguyen, T.-Q.; Wu, J.; Doan, V.; Schwartz, B. J. Science 2000, 288, 652.
16. (e) Schwartz, B. J. Annu. Rev. Phys. Chem. 2003, 54, 141.
17. Samuel, I. D. W.; Rumbles, G.; Collison, C. J.; Moratti, S. C.; Holmes, A. B. Chem. Phys. 1998, 227, 75.
18. (a) Collison, C. J.; Rothberg, L. J.; Treemaneekarn, V.; Li, Y. Macromolecules 2001, 34, 2346.
19. (b) Wang, P.; Collison, C. J.; Rothberg, L. J. J. Photochem. Photobiol. A: Chem. 2001, 144, 63.
20. Zhang, H.; Lua, X.; Lib, Y.; Ai, X.; Zhang, X.; Yang, G. J. Photochem. Photobiol. A: Chem. 2002, 147, 15.
21. (a) Halkyard, C. E.; Rampey, M. E.; Kloppenburg, L.; Studer-Martinez, S. L.; Bunz, U. H. F. Macromolecules 1998, 31, 8655.
22. (b) Feisel, R.; Halkyard, C. E.; Rampey, M. E.; Kloppenburg, L.; Studer-Martinez, S. L.; Scherf, U.; Bunz, U. H. F. Macromol. Rapid Commun. 1999, 20, 107.
23. Chu, Q.; Pang, Y. Macromolecules 2003, 36, 4614.
24. (a) Hsu, J.-H.; Fann, W. S.; Tsao, P.-H.; Chuang, K.-R.; Chen, S.-A. J. Phys. Chem. A 1999, 103, 2375.
25. (b) Wachsmann-Hogiu, S.; Peteanu, L. A.; Liu, L. A.; Yaron, D. J.; Wildeman, J. J. Phys. Chem. B. 2003, 107, 5133.
26. (a) Rothberg, L. J.; Yan, M.; Papadimitrakopoulos, P.; Galvin, M. E.; Kwock, E. W.; Miller, T. M. Synth. Met. 1996, 80, 41.
27. (b) Jakubiak, R.; Collison, C. J.; Wan, W. C.; Rothberg, L. J.; Hsieh, B. R. J. Phys. Chem. A 1999, 103, 2394.
28. (c) Huser, T.; Yan, M.; Rothberg, L. J. Proc. Natl. Acad. Sci. U.S.A. 2000, 97, 11187.
29. (d) Huser, T.; Yan, M. J. Photochem. Photobiol. A: Chem. 2001, 144, 43.
30. (e) Nguyen, T.-Q.; Schwartz, B. J. J. Chem. Phys. 2002, 116, 8198.
31. (f) Nguyen, T.-Q.; Yee, R. Y.; Schwartz, B. J. J. Photochem. Photobiol. A: Chem. 2001, 144, 21.
32. (g) Tan, C. H.; Inigo, A. R.; Fann, W.; Wei, P.-K.; Perng, G.-Y.; Chen, S.-A. Org. Elect. 2002, 3, 81.
33. (h) Geens, W.; Shaheen, S. A.; Wessling, B.; Brabec, C. J.; Poortmans, J.; Sariciftci, N. S. Org. Elect. 2002, 3, 105.
34. (i) Sartori, S. S.; Feyter, S. D.; Hofkens, J.; Van den Auweraer, M.; De Shryver, F.; Brunner, K.; Hofstraat, J. W. Macromolecules 2003, 36, 500.
35. (a) Padmanaban, G.; Ramakrishnan, S. J. Am. Chem. Soc. 2000, 122, 2244.
36. (b) Padmanaban, G.; Ramakrishnan, S. Synth. Met. 2001, 119, 533.
37. (c) Padmanaban, G.; Ramakrishnan, S. Pramana, J. Phys. 2003, 61, 425.
38. (d) Padmanaban, G.; Nagesh, K.; Ramakrishnan, S. J. Polym. Sci. Part A. Polym. Chem. 2003, 41, 3929.
39. Hu, D.; Yu, L.; Padmanaban, G.; Ramakrishnan, S.; Barbara, P. F. Nano Lett. 2002, 2, 1121.
40. Perrin, D. D.; Armarego, W. L. F.; Perrin, D. R. Purification of Laboratory Chemicals; Pergamon Press: Oxford, U.K., 1980.
41. (a) Stalmach, U.; Kolshorn, H.; Brehm, I.; Meier, H. Liebigs Ann. 1996, 1449.
42. (b) Meier, H.; Stalmach, U.; Kolshorn, H. Acta Polym. 1997, 48, 379.
43. (c) Stalmach, U. Dissertation Thesis, University of Mainz, Germany, 1996.
44. The histograms were calculated by use of a simple statistical model that was described in ref 11a. The fractional populations of the oligomeric segments with n > 10 were taken to be spectroscopically indistinguishable and hence have been summed up together in the histogram, as seen for instance in the case of MEHPPV-70.
45. f in the case of MEH oligomeric units in the polymer chain follows a similar behavior with conjugation length.
46. However, due to the varying levels of chain stiffness at different extents of elimination, their hydrodynamic volumes may differ despite their chain length being similar, but we make this assumption as a first approximation. The assumption is supported by the similar values of the Mark-Howink exponent a that we measure for different MEHPPV-x samples; this varied between 0.64 and 0.67. These were measured by GPC in conjunction with a Viscotek Triple detector system.
47. The emission spectra of both the pure samples in DCM were very similar to those seen in the mixture.
48. The complete spectral variations of all the segmented MEHPPV samples in DCE-ethanol mixtures are provided in the Supporting Information.
49. Similar isoemissive points could have been observed in several other variable-temperature experiments, except that in most of these the variations are accompanied by significant changes in the emission areas. In this particular case the change in the net emission area is very small and hence this isoemissive point is readily visualized.