Metal complexes with girard reagents-based ligands

Transition metal complexes with Girard reagent-based ligands

“…IR spectra were recorded at room temperature using KBr pellets, in the range of 4000-400 cm −1 on a Thermo Nicolet (NEXUS 670 FT-IR) spectrophotometer. Electronic spectra were recorded on a Secomam (Anthelie 2, Advanced) and on FT-IR instruments for (1.5 − 2) × 10 −3 mol dm −3 H 2 O and DMF solutions of the ligand and complexes (1)(2)(3). Single-crystal X-ray diffraction experiments were performed on Enraf-Nonius CAD-4 diffractometer.…”

“…ical activity [3,4], Girard reagent hydrazones, quaternary N-acethydrazonium chloride, are also interesting to coordination chemists as a special class of organic ligands; the subject being still insufficiently explored. Namely, if compared with the large number of the known different hydrazones and their complexes, the number of Girard reagent hydrazones and the corresponding complexes is rather small.…”

“…Namely, if compared with the large number of the known different hydrazones and their complexes, the number of Girard reagent hydrazones and the corresponding complexes is rather small. In the complexes that have been synthesized up to now appear Girard-T (trimethylammoniumacethydrazide chloride), hydrazone of acetylmonoxime [4], anisaldehyde [5], salicylaldehyde [3,6,7] and pyridoxal [3,8], then Girard-D (dimethylammoniumacethydrazide chloride) hydrazone of diacetylmonoxime [9], as well as Girard-P (pyridiniumacethydrazide chloride) hydrazone of salicylaldehyde [7,10] and o-hydroxyacetophenone [11].…”

“…As a continuation of our study of the complexes with salicylaldehyde Girard-T hydrazone, in the frame of which the complexes [Zn(SalGT)Cl 2 ] · H 2 O and [Cu(HSalGT)Cl 2 ] · H 2 O have been prepared and characterized [3], in this work is presented the X-ray crystal structure of the ligand itself [H 2 SalGT]Cl (1), then of the newly synthesized [Cu(HSalGT)Br 2 ] · H 2 O (2), as well as of the already mentioned complex [Cu(HSalGT)Cl 2 ] · H 2 O (3). All three compounds were characterized by electronic absorption UV-Vis and IR spectra.…”

Formation Equilibria of Ternary Complexes of Co(Ii) with Girard T (Gt) and Some Amino Acids in Aqueous Solution

“…The interest in the complexes of these reagents and their hydrazones, which, like the other Schiff bases, contain two or more ligating atoms, is of a more recent date. In the known complexes involving hydrazones of Girard's reagents, the bidentate [11][12][13] , or more frequently, tridentate [14][15][16][17] character has been assigned mostly on the basis of spectral data. Girard-T complexes of divalent metal ions M(II) have been reported in solid state 18 , but it's in aqueous solutions are very few .…”