Chemistry Journal of Moldova

 

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Graphycal Abstract: The synthesis of three structurally distinct copper(II) coordination compounds with iminodiacetic acid (H₂IDA) as ligand was achieved by varying the reaction pH. Under neutral conditions (pH 6–6.5), compound 1 formed as a two-dimensional ionic coordination polymer, {[NH₂(CH₃)₂]₂[Cu₃(IDA)₄]·1.75H₂O}ₙ, consisting of layered [Cu₃(IDA)₄]²ₙ⁻ anions stabilized by hydrogen-bonding networks. Under basic conditions (pH 8–8.5), compound 2 was obtained as a neutral 2D molecular polymer, {[Cu₃(IDA)₂(IDAH)₂]·5H₂O}ₙ, built from trinuclear copper units bridged by bi- and monodeprotonated ligands. Under acidic conditions (pH 3), compound 3, ((CH₃)₂OH)₂[Cu(IDA)₂]·[Cu(IDAH)₂], was isolated as an ionic structure containing neutral and anionic mononuclear complexes charge-balanced by protonated dimethylether cations.

 

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Graphycal Abstract: Melissa officinalis L. and Urtica dioica L. were evaluated for their phytochemical composition and antioxidant and anti-lithiatic activities. LC-MS/MS analysis showed that M. officinalis contained a more diverse profile, especially flavonoids and phenolic acids enriched in the ethyl acetate fraction, while U. dioica demonstrated a simpler composition dominated by myricetin, riboflavin, sinapic acid, catechin, and β-carotene in its aqueous fraction. M. officinalis ethyl acetate extract showed the strongest antioxidant capacity in DPPH, ABTS, and FRAP assays. Its aqueous extract also exhibited notable anti-lithiatic activity, inhibiting calcium oxalate crystal formation by 87.12% at 2 mg/mL.

 

 

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Graphycal Abstract: Concentrations of fluoride ions in the Dniester river and Dubasari reservoir, located on the territory of the Republic of Moldova, were analysed for 2011–2024. They ranged 0.05–1.07 mg/L, with higher values during low-water periods. Despite seasonal sampling, no clear dynamics were observed, due to altered hydrological regime. Fluoride levels were lower than the World Health Organization for drinking water.