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

doi:10.1021/jp970983v

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4-N-methylpyridyl)porphyrin (Cu^II-(TMpy-P4)) with synthetic polynucleotides such as Poly(dA-dT)₂ and Poly(dG-dC)₂, the exciplex formation dynamics of photoexcited Cu^II(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 Cu^II(TMpy-P4) mixed with Poly(dA-dT)₂ clearly demonstrate the exciplex formation between photoexcited Cu^II(TMPy-P4) and poly(dA-dT)₂. On the other hand, the exciplex formation of photoexcited Cu^II(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 Cu^II(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 Cu^II(TMpy-P4) in aqueous solution or Cu^II(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 Cu^II(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 language	English
Pages (from-to)	5412-5417
Number of pages	6
Journal	Journal of Physical Chemistry A
Volume	101
Issue number	30
DOIs	https://doi.org/10.1021/jp970983v
Publication status	Published - 1997 Jul 24

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Physical and Theoretical Chemistry

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@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 = jul,

day = "24",

doi = "10.1021/jp970983v",

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 journal › Article › peer-review

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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JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

SN - 1089-5639

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

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