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Positional Effects from σ-Bonded Platinum(II) on Intersystem Crossing Rates in Perylenediimide Complexes: Synthesis, Structures, and Photophysical Properties

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [7];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States); NC State University
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
  3. National Research Centre, Moscow (Russian Federation). Kurchatov Institute
  4. New Mexico Highlands Univ., Las Vegas, NM (United States); Peoples’ Friendship Univ. of Russia (RUDN Univ.), Moscow (Russian Federation)
  5. New Mexico Highlands Univ., Las Vegas, NM (United States)
  6. North Carolina State Univ., Raleigh, NC (United States)
  7. Univ. of Kentucky, Lexington, KY (United States)
In this research, the synthesis and photophysical properties of a series of new chromophores featuring Pt(II) σ-bonded to perylenediimide (PDI) cores are reported. A Pt(PPh3)2X (X = Cl, Br) moiety was attached to PDI in either the ortho or the bay position (2- or 1-positions respectively) or a Pt(PPh3)2 subunit was used to bridge two bay positions (1- and 12-positions) forming a Pt(II) cyclometalate. Through a combination of steady-state and transient absorption and photoluminescence spectroscopy, the excited-state dynamics of these molecules were revealed, indicating that the Pt atom location on the PDI has a substantial impact on observed intersystem crossing (ISC) rates. The ISC time constants for the bay-substituted and cyclometalated PDIs are between 2.67 and 1.29 ns, respectively, determined by the singlet fluorescence decays from the initially populated singlet excited states. In the case of the ortho-substituted PDI, ISC to the triplet state occurs on the ultrafast time scale with a time constant of 345 fs, determined through ultrafast transient absorption spectroscopy. In all examples, the measured PDI-based fluorescence quantum yields quantitatively correlate with the measured ISC rates leaving little doubt that variation in the Pt(II) substitution position(s) markedly influence the resultant photophysics. Electronic structure calculations suggest differing amounts of metal-based contributions in the lowest excited states as a function of substitution position, supporting the trend of the observed ISC rates.
Research Organization:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; Office of Naval Research (ONR); National Science Foundation (NSF); Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0011979
OSTI ID:
1633634
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 25 Vol. 122; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Perylene Bisimide Dyes with up to Five Independently Introduced Substituents: Controlling the Functionalization Pattern and Photophysical Properties Using Regiospecific Bay Substitution journal July 2019
Long-lived triplet excited state in a platinum( ii ) perylene monoimide complex journal January 2018

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