3 nitrobenzaldehyde

The chemicals of analytical ranking for example 2-Nitrobenzaldehyde, 3-Nitrobenzaldehyde, 4-Nitrobenzaldehyde, 4-Methyl-benzenesulfonylhydrazine, AgNO₃, AuCl₃, CdSO₄, Co(NO₃)₂, Cr(NO₃)₃, HgCl₂, NiCl₂, Y(NO₃)₃, ZnSO₄, EtOH, MeOH, NaH₂PO₄, Na₂HPO₄, and nafion (5% ethanolic solution) were purchased from the Sigma Aldrich company, and used as received. A mother solution of Y³⁺ (100.0 mM) was prepared from the purchased chemical, Y(NO₃)₃. A Stuart scientific SMP3 (version 5.0) melting point apparatus (Bibby Scientific Limited, Staffordshire, UK) was used to record the melting point (m.p.), and the reported m.p. was not corrected. ¹H-NMR, and ¹³C-NMR spectra were recorded on an AVANCE-III instrument (400 MHz, Bruker, Fallanden, Switzerland) at 300 k, and chemical shifts were reported in ppm with reference with residual solvent signal. FTIR spectra were recorded as neat on a Thermo scientific NICOLET iS50 FTIR spectrometer (Madison, WI, USA). UV-V is study was conducted using Evolution 300 UV-Vis spectrophotometer (Thermo scientific). I-V method was carried out in order to detect Y³⁺ at a selective point using the modified 2-MNBBSH/GCE by Keithley electrometer (6517A, USA). Warning! Yttrium is poisonous. So, a minute amount of this chemical can be used for the preparation of the essential solution with care.

All the chemicals were obtained from commercial suppliers and were used without further purification. Lead iodide (99.99%, PbI₂) and iodine (≥99.99%, I₂) were purchased from Alfa Aesar. N,N-Dimethyl formamide (DMF) and hydroiodic acid (55% w/w, HI) were purchased from Fisher Scientific. Benzaldehyde, 2-methoxyBenzaldehyde, 4-chloroBenzaldehyde, 4-bromoBenzaldehyde, 3-nitroBenzaldehyde, cinnamaldehyde, 2-methoxycinnamaldehyde, salicylaldehyde, 2-nitrocinnamaldehyde, benzophenone, and methylamine solution (33 wt% in ethanol) were purchased from Sigma-Aldrich.