Studies on Interaction of Electronically Excited Water-Soluble Copper-Porphyrins with DNA by Resonance Raman Spectroscopy

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (4): 600.

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Studies on Interaction of Electronically Excited Water-Soluble Copper-Porphyrins with DNA by Resonance Raman Spectroscopy

ZHAO Xiao-Jie¹, JIANG Shan¹, LU Dong-Sheng¹, LU Lin¹, MAO Ci-Bo¹, AN Cheng-Wu¹, FAN Yong-Chang¹, LI Zai-Guang¹

National Laboratory of Laser Technology, Huazhong University of Sicence and Technology, Wuhan, 430074

Received:1993-06-15 Revised:1993-09-14 Online:1994-04-24 Published:1994-04-24

Abstract

Abstract: The resonance Raman spectra of water-soluble porphyrin Cu(NACN)[Cu-tetrakis(4-N-acetonitrilepyridyl)porphyrin], Cu(NEAE) and Ni(NEAE)[Cu or Ni-tetrakis (4-N-ethylacetatepyridyl) porphyrin] and their complexes with calf thymus DNAat different laser pulse powers were measured with 445 nm pulse laser excitation; The analysis results indicate that both of the copper-porphyrins formed electronic exciplex with DNAbut the Ni(NEAE)did not form, In this experiment, besides copper-porphyrin Raman bands Ⅵ (near 1370 cm^-1)and Ⅷ(near 1570 cm^-1).band Ⅶ(near 1470 cm^-1) also show extra band which symbolizes the formation of exciplex.The triplet of copper-porphyrin with a long life time is quenched by DNAand the exciplex may be formed by charge transfer from triplet of Cu-porphyrin to DNA.

Key words: Water-soluble porphyrins, Exciplex, DNA, Resonance Raman spectroscopy

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ZHAO Xiao-Jie, JIANG Shan, LU Dong-Sheng, LU Lin, MAO Ci-Bo, AN Cheng-Wu, FAN Yong-Chang, LI Zai-Guang. Studies on Interaction of Electronically Excited Water-Soluble Copper-Porphyrins with DNA by Resonance Raman Spectroscopy[J]. Chem. J. Chinese Universities, 1994, 15(4): 600.

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Studies on Interaction of Electronically Excited Water-Soluble Copper-Porphyrins with DNA by Resonance Raman Spectroscopy

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