Abstract
To develop a structure-spectroscopic property relationship in platinum acetylides having poly(aromatic hydrocarbon) ligands, we synthesized a series of chromophores with systematic variation in the number of fused aromatic rings(nFAR) and ligand topology(polyacene(L), polyphenanthrene(Z) or compact(C)). We measured ground state absorption, fluorescence and phosphorescence spectra. We also performed nanosecond and picosecond flash photolysis experiments. To extend the range of compounds in the structure-property relationship, we did DFT calculations on an expanded series of chromophores to calculate the S1 and T1 state energies. In both the DFT results and experiment, the ground state and phosphorescence spectra are a function of both nFAR and ligand topology. In the L chromophores, the S1 and T1 state energies decrease linearly with nFAR. In contrast the S1 and T1 state energies of the Z chromophores oscillate with increasing nFAR. The C chromophores have behavior intermediate between the L and Z chromophores. The picosecond transient spectra show complex behavior, having spectra reflecting intersystem crossing, vibrational cooling and solvent relaxation processes. The nanosecond transient spectra result from the T1 - Tn transition. The timeresolved spectra show no systematic variation with structure, showing more complex behavior than previously studied platinum acetylides having phenylene ethynylene ligands.
Published Version
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