پديدآورندگان :
Ramdar Moosa Institute for Advanced Studies in Basic Sciences (IASBS), , Kazemi Foad kazemi_f@iasbs.ac.ir Institute for Advanced Studies in Basic Sciences (IASBS), , Kaboudin Babak Institute for Advanced Studies in Basic Sciences (IASBS),
چكيده فارسي :
Heterogeneous photocatalysis by semiconductor materials has been gaining increasing
interest in organic synthesis1.TiO2, because of its unique chemical and physical properties,
such as high efficiency, low cost, physical and chemical stability, widespread availability, and
noncorrosive property is broadly used in the fields of solar energy conversion and
photocatalysis2.Li et al. first reported a photoinduced reduction of nitro compounds to the
corresponding amines using TiO2 -P25 as a catalyst under UV light, they used 2 ml of a
0.01M solution of nitrobenzene in the reaction3.An important problem of heterogeneous
photocatalytic reactions is low amount of substrate. Also there aresome limitations for using
semiconductors in water, associated with the low solubility of substrates and over-oxidation
of organic compounds which are a result of the oxidant species produced (such as ˙OH and
O2
˙/HO2
˙) in a photocatalytic process. Photocatalytic reduction of nitroarenes to amines under
sun light and violet LED irradiation in water has been taken in to consideration. To overcome
the solubility problem of nitro compounds in water polyethylene glycol-400 was used as
cosolvent. The reaction was done using a TiO2/PEG-400 system in water as solvent. Under
sunlight irradiation 0.1 mmol of nitro benzene was used. Very interestingly under violet LED
irradiation, 1 mmol of nitro benzene was used in reaction as starting material in water. For
other Derivatives of nitrobenzene 0.5 mmol of nitro compound was used.