A surface enhanced Raman study of the adsorption of tris(2,2-bipyridine)ruthenium(II) and substituted analogues on chemically-deposited silver films |
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| Institution: | 1. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, PR China;2. State Key Laboratory of Elemento-organic Chemistry, Nankai University, PR China;3. Institut für Anorganische Chemie der Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany;1. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;2. Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea;3. Department of Chemistry, University of Ulsan, Ulsan 44610, Republic of Korea;1. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;2. Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea;3. Department of Pharmaceutical Chemistry, V. L. College of Pharmacy, Raichur 584103, India;1. Department of Chemistry, KTH Royal Institute of Technology, 10044 Stockholm, Sweden;2. Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden;3. Molecular Biomimetics, Department of Chemistry – Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120 Uppsala, Sweden;4. Department of Chemical Physics, Lund University, 22100 Lund, Sweden;5. State Key Laboratory of Fine Chemicals, DUT–KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116024, PR China;1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India;2. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, 923-1292, Ishikawa, Japan |
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| Abstract: | The surface enhanced resonance Raman spectroscopy (SERRS) of a series of tris(2,2′-bipyridine)ruthenium(II) complexes on chemically produced silver films is reported. The SERR spectra of Ru(bipy)3]2+, several tris complexes of Ru(II) containing substituted 2,2′-bipyridine (4,4′-dimethyl-,4,4′diphenyl-, 4,4′-diamino- and 4,4′-diethylcarboxylate-2,2′-bipyridine) ligands and the neutral cis-bis complexes Ru(bipy)2(NCS)2] and Ru(bipy)2Cl2] show very high band intensities. The large enhancement arises from the combination of the inherent resonance Raman effect and the surface plasmon resonance (due to the rough nature of the silver film). The molecules are not chemisorbed on the silver surface and hence the enhancement occurs solely via the electromagnetic mechanism. Ale SERR spectra are virtually free of the fluorescence which dominates the corresponding RR spectra thus illustrating the use of SERRS in the vibrational spectroscopy of strongly luminescing species. The SERRS spectra of the substituted 2,2′-bipyridine complexes are discussed. |
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