Pérez León C, Kador L, Peng B, Thelakkat M
University of Bayreuth, Institute of Physics and Bayreuther Institut, für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany.
J Phys Chem B. 2006 May 4;110(17):8723-30. doi: 10.1021/jp0561827.
In the present work the adsorption of a new dye, Ru(dcbpyH(2))(2)(bpy-TPA(2))(2), and the well-known (Bu(4)N)(2)[Ru(dcbpyH)(2)(NCS)(2)] complex on mesoporous anatase films were investigated to clarify the role of the carboxylate groups in the anchoring process of the dyes on the semiconductor surface. For this purpose UV-vis, Raman, resonance Raman, and ATR-FTIR spectroscopies have been used. The results of the Raman experiments at different excitation wavelengths demonstrate that photoinduced charge-transfer processes take place efficiently between the adsorbate and the substrate. Moreover, this is the first time that the Raman spectrum of a Ru-bpy dye (in this case, the dye N719) adsorbed on TiO(2) has been obtained without the resonance condition, only by means of SERS enhancement. The coordination of both complexes on the TiO(2) paste films is proposed to occur via bidentate or bridging linkage.
在本工作中，研究了一种新型染料Ru(dcbpyH(2))(2)(bpy - TPA(2))(2)以及著名的(Bu(4)N)(2)[Ru(dcbpyH)(2)(NCS)(2)]配合物在介孔锐钛矿薄膜上的吸附，以阐明羧基在染料在半导体表面锚定过程中的作用。为此，使用了紫外 - 可见光谱、拉曼光谱、共振拉曼光谱和衰减全反射傅里叶变换红外光谱。不同激发波长下的拉曼实验结果表明，吸附质与底物之间有效地发生了光诱导电荷转移过程。此外，这是首次仅通过表面增强拉曼散射（SERS）增强，在没有共振条件的情况下获得吸附在TiO(2)上的Ru - bpy染料（在这种情况下为染料N719）的拉曼光谱。两种配合物在TiO(2)浆料薄膜上的配位被认为是通过双齿或桥连键合发生的。
