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A Luminescent Charge-Transfer Platinum(II) Metallacycle
Felix. N. Castellano, Department of Chemistry and Center for Photochemical Sciences,
Bowling Green State University, Bowling Green, OH 43403
RT
20000
1.0
0.5
0
Normalized Intensity
Intensity
0.0
40000
Normalized Emission
-1
-1
Extinction Coefficient (M cm )
The square-planar platinum(II) acetylides bearing a
lone polyimine ligand have demonstrated promise in
diverse applications. In general, these chromophores
are rich in terms of their photophysics, combining
N
N
P
P
N
N
properties of traditional coordination compounds and
Pt
Pt
Pt
organometallics within the same structure. The excitedstate properties of these compounds emanate from
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2
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charge-transfer processes between the metal center
and diimine ligand that are strongly influenced by the
electronic nature of the acetylide ligands.
Platinum(II)-containing conjugated metallacycles are also emerging as a new class of structurally and
electronically appealing metal-organic materials. Although numerous metallacyclynes have been produced by a
variety of research groups, their photophysical properties remain largely unexplored. In the hope of coupling
metallacycle electronic structures to charge transfer processes in platinum acetylides, we recently designed this
molecule and investigated the photophysics in comparison of model complexes with the ultimate goal of utilizing
their light-absorption and electron transfer properties for solar energy conversion.
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80000
4x10
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77K 1.0
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0 ms
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60000
3x10
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40 ms
2x10
6
1x10
6
0.2
0.0
400
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Wavelength (nm)
0.0
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Wavelength (nm)
800
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Wavelength (nm)
800