A new terpyrrolic analogue of dipyrrolylquinoxalines: an efficient optical-based sensor for anions in organic media

Pentacarbonyl[2‐(2′‐pyridyl)quinoxaline‐κN4]tungsten: A Combined Study of Its Conformational and Electronic Structure Based on Experimental and DFT‐TDDFT Data

“…Besides, the quinoxaline structure is widely recognized as an important component of a great number of natural compounds with applications in areas as diverse as antibacterial, antiviral, anticancer, antifungal, antihelmintic, insecticidal agents, [8] electron-withdrawing groups in p-conjugated polymer chemistry, [9] fluorescent dyes, [10,11] and optical-based sensors for anions in organic media. [12] While the vast majority of these materials are based on organic molecules there has been a growing interest in developing metal-containing compounds over the last few years. The central motivation behind this effort has been to combine the unique properties of transitionmetal complexes (e.g.…”

Anion recognition properties of the neutral receptors bearing amide macrocycle

“…According to these reports, there appears one new triplet resonance at 16.1 ppm in 1 H nmr spectra, the characteristic resonance of bifluoride (F-H-F), This phenomenon can be accounted for by the deprotonation of -NH fragment, which brings electron density onto the phenyl rings according to a through-bond mechanism, thus inducing upfield shift [31]. In fact, the increase of electron density in the phenyl rings after deprotonation, causes a shielding effect and should promote an upfield shift.…”

“…In recent years, increasing attention in the field of hostguest chemistry has been devoted to the fast development of anion recognition systems [1][2][3][4][5][6][7][8][9][10]. Considerable attention has focused on the design of anion receptors because of the important roles of anions in bio-medicinal and environmental fields [11].…”

Phenanthroline complexes bearing diamide-anion recognition sites

“…1,2-bis-acetamido-4,5-bis-nitrobenzene (3) was synthesized according to the reported process [11]. 1 1,2-bis-acetamido-4,5-bis-aminobenzene (4) [12]: A slurry of compound 1,2-bis-acetamido-4,5-bis-nitrobenzene (282 mg) and Pd/C (10%, 70 mg) in dry EtOH (200 cm 3 ) was maintained under hydrogen with stirring for 12 h. The mixture was filtered through a bed of Celite and then washed twice with EtOH (2 Â 20 cm 3 ). The solvents were removed under reduced pressure and the yellowish solid dried in vacuum.…”

“…The important current research topic in supramolecular chemistry is the development of synthetic receptors, especially those specific for anions [1,2]. Anion artificial receptors have represented the unique application prospect in anion sensor [3], phase-transfer catalysts [4], separation and anion-selective electrodes etc.…”