Stabilizing g-States in Centrosymmetric Tetrapyrroles: Two-Photon-Absorbing Porphyrins with Bright Phosphorescence
Journal Article
·
· Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Central Florida, Orlando, FL (United States)
- Univ. of Zurich (Switzerland)
- Univ. of Central Florida, Orlando, FL (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation); South Ural State Univ., Chelyabinsk (Russia); National Nuclear Research Univ. MEPhI, Moscow (Russia)
With time-dependent density functional theory (TDDFT) and sum-overstates (SOS) formalism, we predicted significant stabilization of 2P-active g-states in a compact fully symmetric porphyrin, in which all four pyrrolic fragments are fused with phathalimide residues via the β-carbon positions. The synthesis of a soluble, nonaggregating meso-unsubstituted tetraarylphthalimidoporphyrin (TAPIP) was then developed, and the spectroscopic measurements confirmed that a strongly 2P-active state in this porphyrin is stabilized below the B (Soret) state level. Single-crystal X-ray analysis revealed near-ideally planar geometry of the TAPIP macrocycle, while its tetra-meso-arylated analogue (meso-Ar4TAPIP) was found to be highly saddled. Consistent with these structural features, Pt meso-Ar4TAPIP phosphoresces rather weakly (Φphos = 0.05 in DMF at 22 °C), while both Pt and Pd complexes of TAPIP are highly phosphorescent (Φphos = 0.45 and 0.23, respectively). Furthermore, PdTAPIP exhibits non-negligible thermally activated (E-type) delayed fluorescence (Φfl(d) ~ 0.012). Taken together, these photophysical properties make metal complexes of meso-unsubstituted tetaarylphthalimidoporphyrins the brightest 2P-absorbing phosphorescent chromophores known to date.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- National Institutes of Health (NIH); National Science Foundation (NSF); Swiss National Science Foundation; USDOE
- OSTI ID:
- 1480255
- Journal Information:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Journal Name: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Journal Issue: 33 Vol. 121; ISSN 1089-5639
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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