Preparation, structural characterization and luminescence studies of mono- and binuclear Zn(II) and Cd(II) acetates with pyridine-4-aldoxime and pyridine-4-amidoxime ligands

Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers

“…Thus it is difficult to unequivocally assign this transition to one or another linker. A mixture characteristics of intraligand and ligand-to-ligand charge transition (LLCT) has already been reported for other Zn(II) complexes based on N-donor and O-donor ligands [12,46]. However, as both profiles of emission bands of (1) and (2) are similar to that obtained for the free ligand benzimidazole, therefore, the luminescence properties of these samples may be attributed mainly to the benzimidazole ligand [14].…”

Five-Coordinated Geometries from Molecular Structures to Solutions in Copper(II) Complexes Generated from Polydentate-N-Donor Ligands and Pseudohalides

“…Synthesis of the organic ligands : The compounds [(2-pyridyl)-2-ethyl)-(3,4-dimethoxy)-2-methylpyridyl]methylamine (L 1 ) and [(2-pyridyl)-2-ethyl)-(3,4-dimethoxy)-2-methylpyridyl]-methylamine (L 2 ) [ 59 ], [bis(3,5-dimethyl-ethyl-pyrazol-1 H -1-yl)-(3,4-dimethoxy-2-methylpyridyl)]amine (L 3 ) [ 60 ], [bis(2-methylpyridyl)-(3,4-dimethoxy-2-methylpyridyl)]-amine, (L 4 ) [ 8 ] and tris(3,5-dimethyl-ethyl-1 H -pyrazol-1-yl)amine (tedmpza) [ 61 , 62 ] were prepared and characterized according to the published procedures.…”

Quantitative analysis of amphiphilic N-alkyloxypyridinecarboximidamide by liquid chromatography–tandem mass spectrometry

“…The most important key issues for the preparation of such compounds are a complexing nature of the N -hydroxypyridine-2- or -4-carboximidamide, which can coordinate to the divalent metal ions mainly through their pyridine or amine and imine nitrogen atom forming five- or six-membered chelate rings (Salonen et al 2008; Salonen 2010; Konidaris et al 2011; Coropceanu et al 2014; Nandy et al 2013). Preparation of simple N -hydroxyimidamides through an O -alkylation reaction has been described frequently (Izawa et al 1993; Michaelis 1891; Eloy and Lenaers 1962).…”

“…N -substituted amidines, similar to well known simple amidoximes (Abele et al 2003 ), have already been used as antimicrobial (Hall et al 1998 ; Boykin et al 1996 ), insecticidal (Paul 1981 ), herbicidal or plant growth regulatory agents (Farge et al 1978 , 1980 ) as well as DNA photo-cleavage agents (Karamtzioti et al 2015 ) reactivators of nerve agent and pesticide poisoning (Kliachyna et al 2014 ) and as regulator of blood pressure (Izawa et al 1993 ). The most important key issues for the preparation of such compounds are a complexing nature of the N -hydroxypyridine-2- or -4-carboximidamide, which can coordinate to the divalent metal ions mainly through their pyridine or amine and imine nitrogen atom forming five- or six-membered chelate rings (Salonen et al 2008 ; Salonen 2010 ; Konidaris et al 2011 ; Coropceanu et al 2014 ; Nandy et al 2013 ). Preparation of simple N -hydroxyimidamides through an O -alkylation reaction has been described frequently (Izawa et al 1993 ; Michaelis 1891 ; Eloy and Lenaers 1962 ).…”