An ultrasonic method (20 kHz) is introduced to activate
pristine
ibuprofen organic molecular crystals via complexation with silver
in nitrogen-doped oxidized graphene nanoplatforms (∼50 nm).
Ultrasonic complexation occurs in a single-step procedure through
the binding of the carboxylic groups with Ag and H-bond formation,
involving noncovalent πC=C → πC=C* transitions in the altered phenyl ring and πPY →
πCO* in ibuprofen occurring between the phenyl ring
and C–O bonds as a result of interaction with hydroxyl radicals.
The ibuprofen–silver complex in ≪NrGO≫ exhibits
a ∼42 times higher acceleration rate than free ibuprofen of
the charge transfer between hexacyanoferrate and thiosulfate ions.
The increased acceleration rate can be caused by electron injection/ejection
at the interface of the ≪Ag-NrGO≫ nanoplatform and formation
of intermediate species (Fe(CN)5(CNSO3)
x− with x = 4 or 5
and AgHS2O3) at the excess of produced H+ ions. Important for microwave chemotherapy, ibuprofen–silver
complexes in the ≪NrGO≫ nanoplatform can produce H+ ions at ∼12.5 times higher rate at the applied voltage
range from 0.53 to 0.60 V. ≪Ibu-Ag-NrGO≫ NPs develop
∼105 order higher changes of the electric field
strength intensity than free ibuprofen in the microwave absorption
range of 100–1000 MHz as revealed from the theoretical modeling
of a cervix tumor tissue.
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