POTENTIOMETRIC STUDIES ON COMPLEX IRON SYSTEMS

Studies on Nickel(II)-Pyridoxamine-Imidazole Containing Mixed Ligand Complex Systems

The stability constants of species present in the systems Ni(II)-pyridoxamine(pym)(A) and Ni(II)-pyridoxamine(pym)(A)-imidazole containing ligands(B) [B = imidazole(him),  benzimidazole(bim), histamine(hist) and L-histidine(his)] have been determined pH-metrically using the MINIQUAD computer program. The existence of the species NiAH, NiA and NiA2 was proven for the Ni(II)-pym(A)...

Potentiometric Studies on Stepwise Mixed Ligand Complex Formation Copper(II)-Iminodiacetic Acid-Hydroxy Acid

Cl6 = 0.3269 Cl7 0.7458 Cl,10 = 0.6322 C26 = 0.6428 C18 0.2978 Ci,11 = — 0.1488 C36 = 0.6725 Cl9 = 0.4364 Cl,12 = — 0.4904 C46 = 0.1488 C27 = 0.1340 C2.10 = 0 Cö6 = 0 C28 = 0.4845 C2.11 = 0 C7.10 = 0.7260 C29 = 0.6087 C2.12 = 0 C7,ll = 0.5467 y s37 = 0.3405 C3.10 = 0.6793 ^7,12 = 0.4507 C38 = 0.0394 C3. l l = 0.6793 £8,10 0.6176 C39 == 0.2440 C3.12 = 0.2151 -8.1 1 = 0.7615 C47 = 0.1087 C4,10 = ...

Spectroscopic and potentiometric studies on derivatized natural humic acid.

Isolated soil humic acid (HA) and commercial Aldrich HA were derivatized by esterification with methanol-thionyl and acetylation with acetic anhidride, in order to obtain derivatives with selectively blocked carboxyl and phenol groups, respectively. Results obtained by FT-IR spectroscopy and potentiometry show that the methanol-thionyl procedure is a selective, specific and efficient route for ...

Complex fuzzy linear systems

Potentiometric and multi-NMR studies of aluminum(III) complex with L-glutamate in acidic aqueous solutions.

Complex formation studies of L-glutamate with aluminum(III) ion were conducted in acidic aqueous solutions (pH 2.0 - 5.5) by means of pH-metric titration and multinuclear (1H, 13C and 27Al) NMR techniques. The following results were obtained: (1) Al could weakly coordinate with Glu to form various mononuclear 1:1 (AlLH2+, AlL+, AlLH(-1)) species and dinuclear 2:1 (Al2L4+) species in acidic aque...