used, viz. 2-bromo-3-(methylamino)naphthalene-1,4-dione photosensitizers,
were synthesized and characterized using the literature-reported procedure
and purified by column chromatography with toluene:methanol (9:1)
as eluent.52 (link) 2,3-Dibromonaphthalene-1,4-dione
(DBrNQ) and fluorine-doped tin oxide (FTO) having a resistance of
16 Ω/□ (ohms per square) were purchased from Sigma-Aldrich.
Methylamine (40%) was purchased from LOBA Chemicals India. Methanol
(AR), ethanol (AR), dichloromethane (AR), and toluene (LR) were purchased
from Merck Chemicals. Dimethyl sulfoxide (HPLC; Sigma-Aldrich), titanium
(IV) butoxide (97%; Sigma-Aldrich), and hydrochloric acid (35–37%;
Junsei, Japan) were used as received. toluene was purified by standard
reported methods,53 and dry methanol was
prepared by the literature-reported procedure.54 (link)