Exciplex formation dynamics of photoexcited copper(II) tetrakis(4-N-methylpyridyl)porphyrin with synthetic polynucleotides probed by transient absorption and raman spectroscopic techniques

Sae Chae Jeoung, Hyo Soon Eom, Dongho Kim, Dae Won Cho, Minjoong Yoon

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Abstract

To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4-N-methylpyridyl)porphyrin (CuII-(TMpy-P4)) with synthetic polynucleotides such as Poly(dA-dT)2 and Poly(dG-dC)2, the exciplex formation dynamics of photoexcited CuII(TMpy-P4) with added polynucleotides have been investigated by using femtosecond transient absorption as well as transient Raman spectroscopic methods. The nanosecond transient Raman spectra of CuII(TMpy-P4) mixed with Poly(dA-dT)2 clearly demonstrate the exciplex formation between photoexcited CuII(TMPy-P4) and poly(dA-dT)2. On the other hand, the exciplex formation of photoexcited CuII(TMpy-P4) with poly(dG-dC)2 is not so manifest as compared with that mixed with poly(dA-dT)2. The transient absorption of CuII(TMpy-P4) mixed with Poly(dG-dC)2 exhibits a rise component of 1.3 ps in addition to the very slow decay component (τ ∼ 22 ns). This observation is quite different from that of CuII(TMpy-P4) in aqueous solution or CuII(TMpy-P4) mixed with poly(dA-dT)2, because the exciplex formed in poly(dG-dC)2, if any, is so short-lived that it returns quickly back to four-coordinate CuII(TMpy-P4) intercalated at poly(dG-dC)2, which blocks the axial coordination by water molecules and consequently gives rise to a long lifetime (τ ∼ 22 ns).

Original languageEnglish
Pages (from-to)5412-5417
Number of pages6
JournalJournal of Physical Chemistry A
Volume101
Issue number30
Publication statusPublished - 1997 Jul 24

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polynucleotides
Polynucleotides
Poly dA-dT
Porphyrins
porphyrins
Copper
copper
water
Water
Raman spectra
aqueous solutions
life (durability)
decay
Raman scattering
poly(dC-dG)
molecules
Molecules
interactions

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

@article{8785a4eaefa74b74bf4183f21b26ea67,
title = "Exciplex formation dynamics of photoexcited copper(II) tetrakis(4-N-methylpyridyl)porphyrin with synthetic polynucleotides probed by transient absorption and raman spectroscopic techniques",
abstract = "To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4-N-methylpyridyl)porphyrin (CuII-(TMpy-P4)) with synthetic polynucleotides such as Poly(dA-dT)2 and Poly(dG-dC)2, the exciplex formation dynamics of photoexcited CuII(TMpy-P4) with added polynucleotides have been investigated by using femtosecond transient absorption as well as transient Raman spectroscopic methods. The nanosecond transient Raman spectra of CuII(TMpy-P4) mixed with Poly(dA-dT)2 clearly demonstrate the exciplex formation between photoexcited CuII(TMPy-P4) and poly(dA-dT)2. On the other hand, the exciplex formation of photoexcited CuII(TMpy-P4) with poly(dG-dC)2 is not so manifest as compared with that mixed with poly(dA-dT)2. The transient absorption of CuII(TMpy-P4) mixed with Poly(dG-dC)2 exhibits a rise component of 1.3 ps in addition to the very slow decay component (τ ∼ 22 ns). This observation is quite different from that of CuII(TMpy-P4) in aqueous solution or CuII(TMpy-P4) mixed with poly(dA-dT)2, because the exciplex formed in poly(dG-dC)2, if any, is so short-lived that it returns quickly back to four-coordinate CuII(TMpy-P4) intercalated at poly(dG-dC)2, which blocks the axial coordination by water molecules and consequently gives rise to a long lifetime (τ ∼ 22 ns).",
author = "Jeoung, {Sae Chae} and Eom, {Hyo Soon} and Dongho Kim and Cho, {Dae Won} and Minjoong Yoon",
year = "1997",
month = "7",
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language = "English",
volume = "101",
pages = "5412--5417",
journal = "Journal of Physical Chemistry A",
issn = "1089-5639",
publisher = "American Chemical Society",
number = "30",

}

Exciplex formation dynamics of photoexcited copper(II) tetrakis(4-N-methylpyridyl)porphyrin with synthetic polynucleotides probed by transient absorption and raman spectroscopic techniques. / Jeoung, Sae Chae; Eom, Hyo Soon; Kim, Dongho; Cho, Dae Won; Yoon, Minjoong.

In: Journal of Physical Chemistry A, Vol. 101, No. 30, 24.07.1997, p. 5412-5417.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Exciplex formation dynamics of photoexcited copper(II) tetrakis(4-N-methylpyridyl)porphyrin with synthetic polynucleotides probed by transient absorption and raman spectroscopic techniques

AU - Jeoung, Sae Chae

AU - Eom, Hyo Soon

AU - Kim, Dongho

AU - Cho, Dae Won

AU - Yoon, Minjoong

PY - 1997/7/24

Y1 - 1997/7/24

N2 - To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4-N-methylpyridyl)porphyrin (CuII-(TMpy-P4)) with synthetic polynucleotides such as Poly(dA-dT)2 and Poly(dG-dC)2, the exciplex formation dynamics of photoexcited CuII(TMpy-P4) with added polynucleotides have been investigated by using femtosecond transient absorption as well as transient Raman spectroscopic methods. The nanosecond transient Raman spectra of CuII(TMpy-P4) mixed with Poly(dA-dT)2 clearly demonstrate the exciplex formation between photoexcited CuII(TMPy-P4) and poly(dA-dT)2. On the other hand, the exciplex formation of photoexcited CuII(TMpy-P4) with poly(dG-dC)2 is not so manifest as compared with that mixed with poly(dA-dT)2. The transient absorption of CuII(TMpy-P4) mixed with Poly(dG-dC)2 exhibits a rise component of 1.3 ps in addition to the very slow decay component (τ ∼ 22 ns). This observation is quite different from that of CuII(TMpy-P4) in aqueous solution or CuII(TMpy-P4) mixed with poly(dA-dT)2, because the exciplex formed in poly(dG-dC)2, if any, is so short-lived that it returns quickly back to four-coordinate CuII(TMpy-P4) intercalated at poly(dG-dC)2, which blocks the axial coordination by water molecules and consequently gives rise to a long lifetime (τ ∼ 22 ns).

AB - To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4-N-methylpyridyl)porphyrin (CuII-(TMpy-P4)) with synthetic polynucleotides such as Poly(dA-dT)2 and Poly(dG-dC)2, the exciplex formation dynamics of photoexcited CuII(TMpy-P4) with added polynucleotides have been investigated by using femtosecond transient absorption as well as transient Raman spectroscopic methods. The nanosecond transient Raman spectra of CuII(TMpy-P4) mixed with Poly(dA-dT)2 clearly demonstrate the exciplex formation between photoexcited CuII(TMPy-P4) and poly(dA-dT)2. On the other hand, the exciplex formation of photoexcited CuII(TMpy-P4) with poly(dG-dC)2 is not so manifest as compared with that mixed with poly(dA-dT)2. The transient absorption of CuII(TMpy-P4) mixed with Poly(dG-dC)2 exhibits a rise component of 1.3 ps in addition to the very slow decay component (τ ∼ 22 ns). This observation is quite different from that of CuII(TMpy-P4) in aqueous solution or CuII(TMpy-P4) mixed with poly(dA-dT)2, because the exciplex formed in poly(dG-dC)2, if any, is so short-lived that it returns quickly back to four-coordinate CuII(TMpy-P4) intercalated at poly(dG-dC)2, which blocks the axial coordination by water molecules and consequently gives rise to a long lifetime (τ ∼ 22 ns).

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