Crystal structure and theoretical studies of the keto-enol isomerism of N,N′-bis(salicylidene)-o-phenylenediamine (salophen)

Crystal structure of 2-(9H-fluoren-9-ylidene)hydrazine-1-carbothioamide, C14H11N3S

“…. The shorter N18-C16 and N15-C16 bond distances, 1.324(2) and 1.362(2) Å; respectively, are indicative and consistent with ∼60% of considerable double-bond character [10]. The molecule as a whole is almost planar because the angle between the least square planes containing the hydrazinecarbothiamide and uorene moiety is 0.54 (0.07), and the hydrazinecarbothiamide fragment N14/N15/C16/N18/S17 is planar with maximum deviation of 0.014°for N14.…”

Uranyl(VI) binding by bis(2-hydroxyaryl)diimine and bis(2-hydroxyaryl)diamine ligand derivatives. Synthetic, X-ray, DFT and solvent extraction studies

“…UV data were collected using a Perkin Elmer type Lambda 25 spectrophotometer in the range 200-1200 nm. The syntheses of H 2 L 1 (from m-xylylenediamine and salicylaldehyde) [32,33], H 2 L 5 (from o-aminophenol and isophthalaldehyde) [34], H 2 L 6 (from 1,2-phenylenediamine and salicylaldehyde) [33,35] and (H 2 L 7 ) (from (±)-trans-1,2-diaminocyclohexane and salicylaldehyde) [36,37] were carried out by the respective literature procedures.…”

Crystal Structure, Spectral Characterization and Biologically Studies of Mononuclear Transition Metal Complexes Derived from New N2O2 Type Ligand

“…There is no solvent molecule appear in the structure. From this crystal structure study, it is confirmed that the symmetric Schiff base having two imine nitrogen atoms and two phenolic oxygen atoms (N 1 , N 2 , O 1 , O 2 ) has been successfully synthesized and suggests that this ligand can easily act as tetradentate donor [23,24].…”