Synthesis and properties of mononuclear and binuclear molybdenum complexes derived from bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone

Heteroleptic Phenanthroline Complexes of Trinuclear Molybdenum Clusters with Luminescent Properties

“…Steady-state fluorescence measurements combined with time-resolved ones can provide an illustrative picture of the processes taking place in the excited states, and they can inform about the potential utility of new chemical species for practical applications as photonic devices. [34,35] The steady-state emission spectra of complexes 1 and 2 in DMF (upon excitation at 330 nm) have maxima at 448 nm and 451 nm, respectively, the shape and position of which coincide with that of the IPDOD ligand (450 nm); the emission quantum yield φ F is higher for IPDOP (0.21) than for complexes 1 (0.06) and 2 (0.11), as shown in Table 1. Compounds based on the imidazophenanthroline moiety have attracted a great deal of attention in recent years because of their excellent properties, which render them suitable for incorporation in materials with potential photonic applications, such as sensors, electroluminescence devices, dye-sensitized solar cells, or photodynamic therapy.…”

New Bis-Diphenyltin(IV) Complexes With Oxalyldihydrazone Derivatives: Synthesis, Characterization And Antibacterial Activity

“…Bis(2-hydroxy-1-naphthaldehyde)oxalyldihydrazone (H 4 L a ) was prepared by refluxing hot dilute ethanol solution of oxalyldihydrazide with 2-hydroxy-1-naphthaldehyde by the literature method. 36,37 IR spectra were obtained using a FT BOMEM MB102 spectrophotometer. The 1 H and 119 Sn NMR spectra were recorded with a Bruker 400 or 250 MHz Avance Ultrashield spectrometer using TMS and SnMe 4 , as references, respectively.…”

Synthesis and characterization of heterobimetallic Ni(II)–Zn(II) complexes from bis(2-hydroxy-1 -naphthaldehyde)succinoyldihydrazone

“…The average negative shift of 2-3 cm À1 indicates coordination of dihydrazone through azomethine nitrogen to metal [50]. The existence of two (C ¼ N) bands shows that the two azomethine nitrogens are inequivalent, suggesting that the two M N bonds are not the same; the differences between (C ¼ N) stretching frequencies of the order of 13-18 cm À1 fall in the range for anti-cis configuration [49,51]. Thus, dihydrazone exists in the anti-cis configuration in the complexes as also deduced from 1 H-NMR spectroscopy of 1.…”

“…The azomethine proton signals at 8.60 and 9.05 ppm as doublets in the free dihydrazone appear at 8.99 and 9.13 ppm as doublets, showing coordination of azomethine nitrogen to zinc. Azomethine proton signals in the uncoordinated dihydrazone and 1 as two resonances only suggests that the dihydrazone is coordinated to zinc in the anti-cis configuration[49].…”