TY - JOUR
T1 - Surface-enhanced raman scattering of 2,2′-bipyridine adsorbed on colloidal silver and stabilized AgBr sols
AU - Kamyshny, Alexander L.
AU - Zakharov, Valery N.
AU - Fedorov, Yury V.
AU - Galashin, Anatoly E.
AU - Aslanov, Leonid A.
PY - 1993/6
Y1 - 1993/6
N2 - SERS investigations of 2,2′-bipyridine molecules adsorbed on Ag colloids and AgBr sols are reported. Absorption spectra and electron micrographs of colloidal systems were studied and evolution of silver particles formed at photolysis of silver bromide was described. The character of SERS spectra and their dependence on 2,2′-bipyridine concentration evidence the formation of two types of complexes bound to the surface in edge-on orientation through the lone-pair electrons of the N atoms. At low concentrations the strongly chemisorbed complex with a Lewis acid coordination structure prevails and at high concentrations the complex with usual coordination σ bonds analogous to that in complex ion Ag (bpy)+2 forms. The bromide ion participation in creating the active sites for the formation of strongly chemisorbed surface complexes is proposed. The electromagnetic mechanism of Raman scattering enhancement is assumed to prevail in the systems studied, although a certain contribution of the chemical enhancement is not excluded.
AB - SERS investigations of 2,2′-bipyridine molecules adsorbed on Ag colloids and AgBr sols are reported. Absorption spectra and electron micrographs of colloidal systems were studied and evolution of silver particles formed at photolysis of silver bromide was described. The character of SERS spectra and their dependence on 2,2′-bipyridine concentration evidence the formation of two types of complexes bound to the surface in edge-on orientation through the lone-pair electrons of the N atoms. At low concentrations the strongly chemisorbed complex with a Lewis acid coordination structure prevails and at high concentrations the complex with usual coordination σ bonds analogous to that in complex ion Ag (bpy)+2 forms. The bromide ion participation in creating the active sites for the formation of strongly chemisorbed surface complexes is proposed. The electromagnetic mechanism of Raman scattering enhancement is assumed to prevail in the systems studied, although a certain contribution of the chemical enhancement is not excluded.
UR - http://www.scopus.com/inward/record.url?scp=0037664180&partnerID=8YFLogxK
U2 - 10.1006/jcis.1993.1244
DO - 10.1006/jcis.1993.1244
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AN - SCOPUS:0037664180
SN - 0021-9797
VL - 158
SP - 171
EP - 182
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 1
ER -