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Evolution of lowest singlet and triplet excited states with number of thienyl rings in platinum poly-ynes

Title data

Chawdhury, Nazia ; Köhler, Anna ; Friend, Richard H. ; Wong, W.-Y. ; Lewis, Jack ; Younus, Muhammad ; Raithby, Paul R. ; Corcoran, Timothy C. ; Al-Mandhary, Muna R. A. ; Khan, Muhammad S.:
Evolution of lowest singlet and triplet excited states with number of thienyl rings in platinum poly-ynes.
In: The Journal of Chemical Physics. Vol. 110 (1999) Issue 10 . - p. 4963.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.478382

Abstract in another language

Soluble, rigid-rod organometallicpolymerstrans-[-Pt(PBun3)2–C≡C–R–C≡C–]∞ (R=bithienyl 2, terthienyl 3) have been synthesized in good yields by the CuI-catalyzed dehydrohalogenation reaction of trans-[Pt(PBun3)2Cl2] with one equivalent of the diterminal alkynyl oligothiophenes H–C≡C–R–C≡C–H in CH2Cl2/iPr2NH at room temperature. We report the thermal properties, and the optical absorption,photoluminescence, and photocurrent action spectra of 1 (trans-[–Pt(PBun3)2–C≡C–R–C≡C–]∞, R=thienyl), 2 and 3 as a function of the number of thiophene rings within the bridging ligand. With increasing thiophene content, the optical gap is reduced and the vibronic structure of the singlet emission changes toward that typical for oligothiophenes. We also find the intersystem crossing from the singlet excited state to the triplet excited state to become reduced, while the singlet–triplet energy gap remains unaltered. The latter implies that, in these systems, the T1 triplet excited state is extended over several thiophene rings. The photoconducting properties do not depend on the size of the thiophene fragment. We discuss and compare our results with studies on oligothiophenes and related organometallicpolymers.

Further data

Item Type: Article in a journal
Refereed: No
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Mar 2015 10:05
Last Modified: 18 Mar 2015 10:17
URI: https://eref.uni-bayreuth.de/id/eprint/8479