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 language | English |
|---|---|
| Pages (from-to) | 5412-5417 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry A |
| Volume | 101 |
| Issue number | 30 |
| Publication status | Published - 1997 Jul 24 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
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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. / 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
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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M3 - Article
VL - 101
SP - 5412
EP - 5417
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 30
ER -