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).
10.1515/znb-2009-0715
The research focuses on the one-step synthesis of 4-arylaminoisoquinazoline-2-carbonitriles, a class of heterocyclic compounds with significant pharmacological importance. The study aims to improve the yield of products obtained from the reaction of 2-aminobenzonitrile and various aniline derivatives, and to synthesize 4-arylaminoisoquinazoline-2-carbonitrile derivatives that could not be obtained by conventional methods. The reactants used include 2-aminoarylbenzimidamides and tetracyanoethylene (TCNE), with the synthesis carried out in ethyl acetate at room temperature for 4 to 6 hours. The synthesized compounds were characterized using various spectroscopic methods such as IR and NMR spectroscopy, and the structure of one of the benzimidamide compounds was confirmed by single crystal X-ray diffraction. The experiments resulted in moderate to good yields of the target compounds, demonstrating a simple and efficient method for synthesizing these heterocyclic compounds.