chemicals were utilized without further purification. Analytical grade
silver(I) nitrate, sodium nitrite, arylamine hydrochloride, enaminone,
sodium acetate, methanol, and ethanol were purchased from Sigma-Aldrich.
The UV–visible absorption spectra of ligands and their synthesized
complexes were recorded using a Shimadzu 1800 UV–vis spectrophotometer
(Japan) equipped with personal spectroscopy software version 2.3.
The infrared spectra (KBr) were recorded on a Perkin–Elmer
model Frontier (USA), whereas the 1H NMR (700 MHz) spectra
were recorded by employing the Bruker DPX 400 MHz spectrometer using
10 mg of the sample and tetramethylsilane (TMS) as an internal standard.
A Shimadzu TGA-50H thermal analyzer (Japan) was used to analyze thermogravimetric
analysis (TGA) measurements. The measurements were performed over
the temperature range of 25–600 °C at a constant heating
rate of 10 °C/min in an inert atmosphere. Pt pans were used sample
holders, whereas alumina powder was used as a reference material.
The particle size and morphology of the synthesized material was analyzed
through a transmission electron microscope (JEOL JEM-1200 EX II, Japan)
by using 60–70 kV accelerating voltage.