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Proceedings Paper

Synthesis and characterization of novel platinum acetylide oligomers
Author(s): Thomas M. Cooper; Douglas M. Krein; Aaron R. Burke; Daniel G. McLean; Joy E. Rogers-Haley; Jonathan Slagle; Jennifer Monahan; Augustine Urbas
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Paper Abstract

To learn about excited state geometry in biphenyl-containing platinum acetylides, we synthesized a series of compounds that have biphenyl ligands. The ligands consisted of biphenyl(I), the hindered 2'-methyl biphenyl(III) and planar fluorenyl(IV) groups. We also synthesized a "half" complex(II) consisting of one ligand attached to the platinum atom. The optical properties of these compounds were measured by ground state absorption, phosphorescence, ultrafast transient absorption and nanosecond transient absorption spectroscopy. DFT calculations were performed to determine the ground state and triplet state geometries and the lowest triplet energy. TDDFT calculations were performed to determine singlet excited state energies. Compared to the reference compound I, ground state spectra show a blue shift in II and III and red shift in IV, showing the singlet energy is sensitive to conjugation and biphenyl twist angle. Comparison of the phosphorescence spectra of I and II shows the triplet exciton is confined to one ligand. The time behavior of the ultrafast excited state absorption spectrum of I shows a red shift within 1 ps from the initial spectrum. This behavior is not seen in IV. The different behavior suggests formation of the triplet state of I is accompanied by conversion from a non-planar to a planar conformation while IV retains a planar conformation.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7049, Linear and Nonlinear Optics of Organic Materials VIII, 704908 (2 September 2008); doi: 10.1117/12.793816
Show Author Affiliations
Thomas M. Cooper, Air Force Research Lab. (United States)
Douglas M. Krein, Air Force Research Lab. (United States)
General Dynamics Information Technology (United States)
Aaron R. Burke, Air Force Research Lab. (United States)
General Dynamics Information Technology (United States)
Daniel G. McLean, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Joy E. Rogers-Haley, Air Force Research Lab. (United States)
UES, Inc. (United States)
Jonathan Slagle, Air Force Research Lab. (United States)
AT&T Government Solutions (United States)
Jennifer Monahan, Air Force Research Lab. (United States)
SOCHE Student Research Program (United States)
Augustine Urbas, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 7049:
Linear and Nonlinear Optics of Organic Materials VIII
Rachel Jakubiak, Editor(s)

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