# OBSERVATION AND ANALYSIS OF THE SERS SPECTRA OF TETRAPHEYLPORPHINE(TPP) AND $IRON(\Pi)$ PROTOPORPHYRIN $(Fe(\Pi)PP)$

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 Title: OBSERVATION AND ANALYSIS OF THE SERS SPECTRA OF TETRAPHEYLPORPHINE(TPP) AND $IRON(\Pi)$ PROTOPORPHYRIN $(Fe(\Pi)PP)$ Creators: Hu, Jun; Sheng, Rongsheng; Xu, Zhisan; Zeng, Yun E. Issue Date: 1993 Publisher: Ohio State University Abstract: The SERS spectra of tetrapheylporphine(TPP) and iron ($\Pi$) protoporphyrin IX $(Fe(\Pi)PP)$ were obtained. Comparing of these two spectra, the bands 994, 1126, 1174, $1218cm^{-1}$ in spectra of TPP assigned to $v(C_{*} - C_{m}), v(C_{*} - N)$ were disappeared or the bands intensity decreased in SERS spectra of $Fe(\Pi)PP$. The band $1480cm^{-1}$ assigned to $v(C_{*}=-C_{*})$ in spectra of TPP was also disappeared in spectra of $Fe(\Pi)PP$. In the region of $1500-1700cm^{-1}$, there were three bands 1544, 1584, $1514cm^{-1}$ for TPP and two bands 1578, $1632cm^{-1}$ for $Fe(\Pi)PP$. Moreover, the band $1578cm^{-1}$ was enhanced intensity comparing with $1632cm^{-1}$ in SERS spectra of $Fe(\Pi)PP$. All these information indicated that, the porphyrin ring of TPP adsorbed on the surface of silver colloid by the four N atoms. But, for the $Fe(\Pi)PP$, since the four N atoms have complexed with $Fe(\Pi)PP$, the vibration modes of $v(C_{*}-C_{m}), v(C_{*}-N)$ were disappared. Description: 1. T. M. Cotton, s. G. Schultz and R. P. Van Duyne, J. Am. Chem. Soc. 104(24), 6528(1982). 2. Yoshihiro Kobayashi and Koschi Itoh, J. Phys. Chem. 89, 5174(1985). 3. L. A. Scanches and T. G. Spiro, J. Phys. Chem. 89, 763(1985). 4. J. J. Memahon, S. Baer and C. A. Meleudres, J. Phys. Chem. 90, 1572(1986). Author Institution: Department of Chemistry, Wuhan University; Center of Analysis and Measurement, Wuhan University URI: http://hdl.handle.net/1811/18418 Other Identifiers: 1993-FC-12