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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
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Univ. of Zurich (Switzerland)
  4. 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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  • Marenich, Aleksandr V.; Cramer, Christopher J.; Truhlar, Donald G.
  • The Journal of Physical Chemistry B, Vol. 113, Issue 18, p. 6378-6396 https://doi.org/10.1021/jp810292n
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Cited By (4)

More homogeneous capillary flow and oxygenation in deeper cortical layers correlate with increased oxygen extraction journal July 2019
Two-Photon-Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment journal January 2018
Imaging of oxygen and hypoxia in cell and tissue samples journal May 2018
New red-emitting Schiff base chelates: promising dyes for sensing and imaging of temperature and oxygen via phosphorescence decay time journal January 2018


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