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Title: Two-Photon Absorbing Phosphorescent Metalloporphyrins: Effects of $$\pi$$-Extension and Peripheral Substitution

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.6b09157· OSTI ID:1488930
 [1];  [2];  [3];  [4];  [1]
  1. University of Pennsylvania, Philadelphia, PA (United States); University of Central Florida, Orlando, FL (United States); University of Zurich (Switzerland); Russian Academy of Sciences (RAS), Moscow (Russian Federation); South Ural State University (Russian Federation); National Nuclear Research University MEPhI, Moscow (Russian Federation)
  2. University of Central Florida, Orlando, FL (United States)
  3. University of Zurich (Switzerland)
  4. University of Central Florida, Orlando, FL (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation); South Ural State University (Russian Federation); National Nuclear Research University MEPhI, Moscow (Russian Federation)

The ability to form triplet excited states upon two-photon excitation is important for several applications of metalloporphyrins, including two-photon phosphorescence lifetime microscopy (2PLM) and two-photon photodynamic therapy (PDT). We analyzed one-photon (1P) and degenerate two-photon (2P) absorption properties of several phosphorescent Pt (II) porphyrins, focusing on the effects of aromatic π-extension and peripheral substitution on triplet emissivity and two-photon absorption (2PA). Our 2PA measurements for the first time made use of direct time-resolved detection of phosphorescence, having the ability to efficiently reject laser background through microsecond time gating. π-Extension of the porphyrin macrocycle by way of syn-fusion with two external aromatic fragments, such as in syn-dibenzo- (DBP) and syn-dinaphthoporphyrins (DNP), lowers the symmetry of the porphyrin skeleton. As a result, DBPs and DNPs exhibit stronger 2PA into the one-photon-allowed B (Soret) and Q states than fully symmetric (D4h) nonextended porphyrins. However, much more 2P-active states lie above the B state and cannot be accessed due to the interfering linear absorption. Alkoxycarbonyl groups (CO2R) in the benzo-rings dramatically enhance 2PA near the B state level. Time-dependent density functional theory (TDDFT) calculations in combinations with the sum-over-states (SOS) formalism revealed that the enhancement is due to the stabilization of higher-lying 2P-active states, which are dominated by the excitations involving orbitals extending onto the carbonyl groups. Furthermore, calculations predicted even stronger stabilization of the 2P-allowed gerade-states in symmetric Pt octaalkoxycarbonyl-tetrabenzoporphyrins. Experiments confirmed that the 2PA cross-section of PtTBP(CO2Bu)8 near 810 nm reaches above 500 GM in spite of its completely centrosymmetric structure. Combined with exceptionally bright phosphorescence (Φphos = 0.45), strong 2PA makes Pt(II) complexes of π-extended porphyrins a valuable class of chromophores for 2P applications. Another important advantage of these porphyrinoids is their compact size and easily scalable synthesis.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Institutes of Health (NIH); National Science Foundation (NSF); Swiss National Science Foundation (SNSF); Russian Science Foundation; Russian Federation
Grant/Contract Number:
EB018464; NS092986; GM103591; DMR11-20901; 14-43-00052; 02.A03.21.0011
OSTI ID:
1488930
Journal Information:
Journal of the American Chemical Society, Vol. 138, Issue 48; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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