10.1007/s11172-011-0360-z
The research focuses on the synthesis and photophysical properties of 2-hydroxybenzaldehyde (2-phenylquinazolin-4-yl)hydrazones and their ZnII complexes. The purpose of this study was to extend the synthesis of fluorine-containing quinazoline derivatives and to investigate their potential as luminescent materials, given that nitrogen heterocyclic derivatives with a phenolic OH group are known as effective ligands and many complexes based on o-hydroxy azomethines exhibit luminescent properties. The researchers synthesized a series of new quinazoline derivatives and their zinc(II) complexes, examining their structures and luminescent properties. The chemicals used in this process included 2-aminobenzonitrile, salicylaldehyde, 2-hydroxy-5-nitrobenzaldehyde, 4-hydroxysalicylaldehyde, 3,5-dibromosalicylaldehyde, and various substituted hydrazines. The study concluded that the synthesized hydrazones and their ZnII complexes exhibited interesting photophysical properties, with the complexation process leading to a bathochromic shift in the absorption spectra and blue shifts in the emission peaks. The researchers also noted that the complexation considerably lowered the Stokes shift and increased the quantum yield, suggesting that these quinazoline-containing hydrazones are promising ligand systems for the design of complexes with other metals, potentially useful in electroluminescent materials and organic light-emitting diodes (OLEDs).
10.1016/j.ejmech.2010.03.012
This research aimed to explore novel urease inhibitors by synthesizing and characterizing three new mononuclear complexes of Cu(II) and Zn(II) with the Schiff base ligand 2-{[2-(2-hydroxyethylamino)ethylimino]methyl}-4-nitrophenol (HL). The purpose was to counteract the negative effects of urease activity, which is a nickel-containing enzyme that hydrolyzes urea to produce ammonia and carbamate, leading to increased ammonia concentrations and pH elevations with implications in medicine and agriculture. The study concluded that two Cu(II) complexes, [CuLNO3] (1) and [CuClL] (2), exhibited strong urease inhibitory activities with IC50 values lower than that of acetohydroxamic acid, a standard urease inhibitor, while the Zn(II) complex [Zn(CH3COO)L] (3) showed no activity at 100 mM concentration. The chemicals used in the process included 5-nitrosalicylaldehyde, N-(2-hydroxyethyl)ethylenediamine for the synthesis of HL, and metal salts such as copper nitrate, copper chloride, and zinc acetate for the formation of the respective complexes.