Separation and complexation of palladium(ii) with a new soft N-donor ligand 6,6′-bis(5,6-dinonyl-1,2,4-triazin-3-yl)-2,2′-bipyridine (C9-BTBP) in nitric acid medium

Abstract

Both 1 : 1 and 2 : 1 Pd–C9-BTBP complexes were found in solution by 1H NMR titration.

Palladium(II) Complexes of Ambidentate and Potentially Cyclometalating 5‐Aryl‐3‐(2′‐pyridyl)‐1,2,4‐triazine Ligands

“…The decisive difference between isomer C and D is that in the former, the two uncoordinated pyridine moieties (5 and 6) are connected through a chain of C atoms, C5 and C6, while in isomer D , the two uncoordinated pyridine groups (3 and 5) are interconnected by C5, N4 and C3. From 3 J and 4 J 1 H 13 C long‐range coupling experiments, we can unequivocally assign the NMR spectra to the isomer C , having the same N Py N2 TZ coordination as the other Pd–PyTZ complexes and other PyTZ, , , , or Py 3 TZ complexes with bidentate coordination , , …”

“…The 5‐aryl‐3‐(2′‐pyridyl)‐1,2,4‐triazine moieties themselves have been used for decades as versatile ligands for transition‐metal complexes with some medical or technical applications. The most important application is probably that of 3‐(2‐pyridyl)‐5,6‐diphenyl‐1,2,4‐triazine‐ p , p′ ‐disulfonic acid [PyTZ(HO 2 SOPh) 2 ], following the nomenclature in Scheme , also called FerroZine™, for the colorimetric detection of Fe II in biological or other systems .…”

“…The most important application is probably that of 3‐(2‐pyridyl)‐5,6‐diphenyl‐1,2,4‐triazine‐ p , p′ ‐disulfonic acid [PyTZ(HO 2 SOPh) 2 ], following the nomenclature in Scheme , also called FerroZine™, for the colorimetric detection of Fe II in biological or other systems . Another important application is the use of the potentially tri‐, tetra‐ or pentadentate 2,6‐bis(5,6‐dipyridyl‐1,2,4‐triazinyl)pyridine ligands for the extraction of lanthanides or actinides . Interestingly, complexes of 3‐(2′‐pyridyl)‐1,2,4‐triazine ligands with Group 10 elements are scarce .…”

“…Interestingly, complexes of 3‐(2′‐pyridyl)‐1,2,4‐triazine ligands with Group 10 elements are scarce . This is strange, since the abovementioned triazinyl‐containing polypyridine ligands are especially attractive for masking the corrosion and fission products Ni II and Pd II in the extraction of actinides, for example, in the PUREX process,, , and Pt II complexes of 3‐(2′‐pyridyl)‐1,2,4‐triazine ligands have been studied for their cytotoxic or antiviral properties . Very recently, the binuclear complex [Pd 2 (NO 3 ) 4 (C9BTBP)] · 2.5H 2 O {C9BTBP = 6,6′‐bis[5,6‐di(nonyl)‐1,2,4‐triazin‐3‐yl]‐2,2′‐bipyridine} was synthesised and characterised by elemental analysis, DSC‐TGA and 1 H NMR spectroscopy in a report dedicated to the separation of Pd II from minor actinides .…”

Efficient Separation of Light Lanthanides(III) by Using Bis‐Lactam Phenanthroline Ligands

“…Phenanthroline‐ and 2,2′‐bipyridine‐based ligands are known to form strong complexes with a variety of metal ions, especially d‐block elements, for example, palladium, copper, iron, and silver, which poses a major problem in the selective recovery of f‐block elements, for example, trivalent lanthanides from rare‐earth‐element‐bearing minerals and used electronic parts and actinides from used nuclear fuel . Because phenanthroline‐based ligands 1 and 2 exhibit a strong preference for Ln III with larger ionic radii, the extraction of the following interfering d‐block metal ions, Ag + , Pd 2+ , Fe 3+ and Cu 2+ , in addition to four different Ln III was investigated.…”