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Surface-enhanced Raman scattering (sers) and surface-enhanced excited-state Raman scattering (seers) of a tris(2,2'-bipyridine)Cr complex adsorbed on colloidal silver

✍ Scribed by K. Kneipp; H. Kneipp; E. Dinjus

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
434 KB
Volume
126
Category
Article
ISSN
0009-2614

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✦ Synopsis

SJZRS on silver sol has been demonstrated to be an attractive and simple spectroscopic tool for transition-metal complexes. The SERS spectra of [Cr(bpy),)3+ on Ag sol are more similar to the solution Raman spectra of [Fe(bpy)3]2' or [Ru(bpy)3]2' than to that of [Cr(bpy)~])+, which gives a strong hint to a reduction of Cr(II1) to Cr(I1) on the silver colloid. The excitation with high-energy Cu-vapour laser pulses results in a clearly changed SERS spectrum, which can be explained by the superposition of the surface-enhanced excited-state Raman spectrum (SEERS) of [Cr(bpy)s12' and its surface-enhanced ground-state spectrum.

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## Surface -enhanced Raman spectra of 2,2 -bipyridine molecules adsorbed on rough silver surfaces were obtained. The spectra are interpreted in terms of two adsorbed species, one of which closely resembles the classical [Ag(bipy) 2 ] Y complex. The spectral features of the second adsorbate indicat