TY - JOUR
T1 - The dual fluorescence on 1-(n,n-dimethylamino)-4-benzonitrile adsorbed on silica and on modified silica surfaces
AU - Levy, Ada
AU - Avnir, David
AU - Ottolenghi, Michael
PY - 1985/11/8
Y1 - 1985/11/8
N2 - The effect of adsorption on the dual fluorescence of the title compound (DMABN) is studied on silica gel and on modified silica surfaces (co-adsorption of cyclohexane and of 1-octanol, octadecyl derivatization and removal of silanols by heating to 800°C). Both positive and relative intensity of the long-wavelength emission originating in the twisted charge transfer excited state (CT- are effected by changes in the interfacial environment. It is concluded that on silica surfaces the CT- state (originating in DMABN hydrogen-bonded to surface silanols) undergoes effective solvation by orientational relaxation of neighbouring silanols. The apparent surface polarity, estimated from the CT- emission frequency, is comparable to that of ethanol. Formation of the CT- state is also indicative of a relatively uninhibited CN rotation in the excited state of the adsorbed molecule which again is similar to the behaviour in ethanol.
AB - The effect of adsorption on the dual fluorescence of the title compound (DMABN) is studied on silica gel and on modified silica surfaces (co-adsorption of cyclohexane and of 1-octanol, octadecyl derivatization and removal of silanols by heating to 800°C). Both positive and relative intensity of the long-wavelength emission originating in the twisted charge transfer excited state (CT- are effected by changes in the interfacial environment. It is concluded that on silica surfaces the CT- state (originating in DMABN hydrogen-bonded to surface silanols) undergoes effective solvation by orientational relaxation of neighbouring silanols. The apparent surface polarity, estimated from the CT- emission frequency, is comparable to that of ethanol. Formation of the CT- state is also indicative of a relatively uninhibited CN rotation in the excited state of the adsorbed molecule which again is similar to the behaviour in ethanol.
UR - http://www.scopus.com/inward/record.url?scp=0001620605&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(85)85517-2
DO - 10.1016/0009-2614(85)85517-2
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AN - SCOPUS:0001620605
SN - 0009-2614
VL - 121
SP - 233
EP - 238
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3
ER -