Derivatization of 4-(Dimethylamino)benzamide to Dual Fluorescent Ionophores: Divergent Spectroscopic Effects Dependent on N or O Amide Chelation

Metal complexes of 3-thiophene carboxamides containing a pyridine ring

“…These values do not vary greatly from those for the free ligand [15] owing perhaps to donation of electron-density to the metal by the electron-rich, directly coordinating chloride ligands (2.3179(7), 2.3327(7) Å) which would decrease the metal-oxygen interaction. The metal center-donor atom bond distances are similar to those reported for other related Cu(II)-amide or amine structures [1,30,38,39].…”

“…A distinctive characteristic of these complexes is that the carbonyl bond distances in the bound ligands have increased, by as much as +0.04 Å, and the amide bond distances have decreased by as much as −0.04 Å. Bond distances for the donor-metal atoms are similar to those in the copper (II) complexes reported by Lapouyade [30], Lebon [1,31], and Choi [32]. 4 , which has no spacer between the amide function and the pyridine ring.…”

Stepwise interactions, sodium ion photoejection and proton-transfer inhibition in a crown-ether and proton-transfer dye

“…The crown-ether rings are frequently used as fluoroionophore complexing sites. They possess a great structural variety that permits to reach a high selectivity and sensitivity in metal ion analysis [1,2,[5][6][7][8][9][10][11][12][13][14][15][16][17]. The most interesting changes are obtained when the complexation process influences the intramolecular charge and proton transfer (ICT, IPT) taking place in the fluorophore fragment.…”

“…The most interesting changes are obtained when the complexation process influences the intramolecular charge and proton transfer (ICT, IPT) taking place in the fluorophore fragment. Moreover, the fragment may contain other complexing sites that can lead to large spectral effects upon complex formation [7,10]. 4 0 -Monoaza-15-crown-5-flavonol (CF) (Scheme 1a) is an interesting metal sensor because upon excitation, the fluorophore moiety suffers an ICT and an IPT process, as well.…”

In-situ fabrication of polyacrylate–silver nanocomposite through photoinduced tandem reactions involving eosin dye

“…However the participation of the carboxylate function to the coordination reaction can not be excluded. In order to determine the reaction constants, the absorption changes as a function of the concentration of AgNO 3 were analyzed according to the model proposed by Valeur et al [44] which is extended to the formation of [1:1] and [1:2] ligand-metal complexes [45]. The inset Figure 2 depicts the best-fitting curve to the experimental data using the method of least squares, log K 1:1 exhibits a high value of ca.…”