Gallium(III) complexes of aroylhydrazones derived from nicotinic acid hydrazide in solid state and in solution (CROSBI ID 285172)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Pocrnić, Marijana ; Kontrec, Darko ; Miljanić, Snežana ; Soldin, Željka ; Budimir, Ana ; Galić, Nives
engleski
Gallium(III) complexes of aroylhydrazones derived from nicotinic acid hydrazide in solid state and in solution
The coordination properties of N'- salicylidene-3-pyridinecarbohydrazide (H2L1), N'- (2-hydroxy-3-methoxyphenylmethylidene)-3- pyridinecarbohydrazide (H2L2), N'-(2-hydroxy-4- methoxyphenylmethylidene)-3- pyridinecarbohydrazide (H2L3), and N'-(2- hydroxy- 5-methoxyphenylmethylidene)-3- pyridinecarbohydrazide (H2L4) towards Ga(III) ions as mimetic for Fe(III) ions were studied in solid state and in solution by mass spectrometry, UV-Vis and IR spectroscopic techniques. Binding properties were probed at different pH values and methanol/water mixture. In methanol/water 1/1 system at pH 2.52 the 1:1 and 1:2 complexes with Ga(III) were formed and corresponding stability constants were determined by UV-Vis spectroscopy. Cumulative constants for Ga(III) complexes (log 2) with ligands H2L1H2L4 amounted to 12.4, 11.5, 10.6 and 11.2 respectively, showing that additional methoxy group in meta position decreases stability of complexes. The complexes isolated from ethanolic solution had 1:2 (metal:ligand) stoichiometry. In all complexes the remaining charge of metal ion was neutralized by nitrate ions as shown by IR spectroscopy. Only for H2L2 the keto-enol tautomeric interconversion was noticed. All complexes were analysed by mass spectrometry and fragmentation pathways were suggested for Ga(HL)2+, GaL+ and Ga(L) (H2O)+. The comparison with analogue Fe(III) complexes was made. It can be concluded that even though the bonds between Ga(III) and ligands are weaker than in the analogue Fe(III) complexes, Ga(III) forms stable complexes, indicating mimetic ability of Ga(III) for Fe(III).
aroylhydrazones ; Ga(III) ; complexes ; spectrometry ; spectroscopy
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Podaci o izdanju
1227
2021.
129564
9
objavljeno
0022-2860
1872-8014
10.1016/j.molstruc.2020.129564