Ultraviolet-visible and surface-enhanced Raman scattering spectroscopy studies on self-assembled films of ruthenium phthalocyanine on organic monolayer-modified silver substrates

被引:18
作者
Li, XL
Xu, WQ
Wang, X
Jia, HY
Zhao, B [1 ]
Li, BF
Ozaki, YH
机构
[1] Jilin Univ, Minist Educ, Key Lab Supermol Struct & Mat, Changchun 130023, Peoples R China
[2] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Chem, Sanda, Hyogo 6691337, Japan
基金
中国国家自然科学基金;
关键词
self-assembly; phthalocyanine; surface-enhanced Raman scattering spectroscopy;
D O I
10.1016/j.tsf.2003.11.298
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A self-assembled film of ruthenium phthalocyanine (RuPc) fabricated on a silver substrate pre-modified with a monolayer of 4-mercaptopyridine (PySH) or 1,4-bis[2-(4-pyridyl)ethenyl]-benzene (BPENB) was studied by ultraviolet-visible (UV-Vis) and surface enhanced Raman scattering (SERS) spectroscopy. PySH or BPENB was used as a ligand to link RuPc since they not only modify the silver substrate, but also deliver a pyridyl group pointing out from the silver surface. Therefore, we can explore the relationship between the structure and orientation of metallophthalocyanine and the substrate modified by the two kinds of organic-monolayers with the different conjugates and molecular lengths. UV-Vis bands due to the organic-monolayer (PySH or BPENB) modified silver films shift to longer wavelengths and a new band arising from the metallophthlocyanine appears, suggesting the binding of RuPc to PySH/BPENB, as well as the interaction between the marcocycle of RuPc and the ring of PySH/BPENB. Vibrational bands arising from both the RuPc and PySH/BPENB moieties appear clearly in the SERS spectra of the RuPc-PySH/BPENB composite films, indicating that RuPc is successfully assembled on the top of PySH/BPENB film. The shifts and relative intensity changes of bands due to PySH or BPENB in the SERS spectra imply the binding of the metallophthalocyanine to the pyridyl group in the composite films. Furthermore, the comparison of the SERS spectra revealed that the orientations of PySH and BPENB in the two kinds of composite films are different; the BPENB moiety in the RuPc-BPENB composite film is more perpendicular to the silver surface compared with the PySH moiety in the RuPc-PySH composite film. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:372 / 380
页数:9
相关论文
共 90 条
[1]   STRUCTURE OF LANGMUIR-BLODGETT-FILMS OF COPPER PHTHALOCYANINE DERIVATIVES [J].
ALBOUY, PA .
JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (34) :8543-8548
[2]   Current status of phthalocyanines in the photodynamic therapy of cancer [J].
Allen, CM ;
Sharman, WM ;
Van Lier, JE .
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 2001, 5 (02) :161-169
[3]   Layer-by-layer growth of electrostatically assembled multilayer porphyrin films [J].
Araki, K ;
Wagner, MJ ;
Wrighton, MS .
LANGMUIR, 1996, 12 (22) :5393-5398
[4]   RAMAN-SPECTRA OF SOLID FILMS .1. METAL-FREE PHTHALOCYANINE [J].
AROCA, R ;
DILELLA, DP ;
LOUTFY, RO .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1982, 43 (08) :707-711
[5]   Surface enhanced vibrational spectra of thymine [J].
Aroca, R ;
Bujalski, R .
VIBRATIONAL SPECTROSCOPY, 1999, 19 (01) :11-21
[6]  
Ashkenasy G, 1999, ANGEW CHEM INT EDIT, V38, P1257, DOI 10.1002/(SICI)1521-3773(19990503)38:9<1257::AID-ANIE1257>3.0.CO
[7]  
2-H
[8]   FORMATION OF MONOLAYER FILMS BY THE SPONTANEOUS ASSEMBLY OF ORGANIC THIOLS FROM SOLUTION ONTO GOLD [J].
BAIN, CD ;
TROUGHTON, EB ;
TAO, YT ;
EVALL, J ;
WHITESIDES, GM ;
NUZZO, RG .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1989, 111 (01) :321-335
[9]   Surface-enhanced Raman scattering of mercaptopyridines and pyrazinamide incorporated in silver colloid adsorbate films [J].
Baldwin, JA ;
Vlckova, B ;
Andrews, MP ;
Butler, IS .
LANGMUIR, 1997, 13 (14) :3744-3751
[10]   Low voltage organic light emitting diodes featuring doped phthalocyanine as hole transport material [J].
Blochwitz, J ;
Pfeiffer, M ;
Fritz, T ;
Leo, K .
APPLIED PHYSICS LETTERS, 1998, 73 (06) :729-731