Coordination properties of N,N′-bis(5-methylsalicylidene)-2-hydroxy-1,3-propanediamine with d- and f-electron ions: crystal structure, stability in solution, spectroscopic and spectroelectrochemical studies

Abstract

The self-assembled metal-promoted synthesis and properties of N,N′-bis(5-methylsalicylidene)-2-hydroxy-1,3-propanediamine (H3L) complexes with d- and f-metal ions are described.

New Heterotrinuclear CuIILnIIICuII (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties

“…The Cu(1) and Cu(2) centers have slightly distorted square pyramidal coordination geometries (Figures 5 and S3) in which the equatorial sites are occupied by two nitrogen and two oxygen atoms of Schiff base ligands. The Cu-O and Cu-N bonds are within normal values (C-O 1.913(4)-1.983(5) Å and C-N 1.960(5)-1.977(5) Å) and comparable to those observed in the related Cu II compounds [40,43,[46][47][48][49]. The apical positions are occupied by oxygen atoms from monodentate nitrate ions and the bond lengths are found to be significantly longer (distances in the range 2.410(6)-2.649(5) Å) than those of Cu-O in the basal plane.…”

Synthesis, characterization, superoxide dismutase, and antimicrobial activities of Co (II) complexes with Schiff base ligand and their hybrid proteins

“…As shown in Scheme 1, salicylaldehyde (10 mmol, 1.22 g) and 2-hydroxy-1,3-propanediamine (5 mmol, 0.45 g) or 1,3-propanediamine (5 mmol, 0.37 g) were refluxed in 40-ml absolute ethanol at 60 C for 5 h, cooled and volatilized to afford the product. [10,11] 1. Salicylaldehyde-2-hydroxy-1,3-propanediamine (H 3 L 1 ): yellow prismatic solid, yield, 60%.…”

Crystal Structure of 1,3-Bis(3,5-dibromosalicylideneamino)-2-propanol

“…9 The bond angles around the imino-nitrogen atom (C7-N1-C8, C10-N2-C11, C24-N3-C25, C27-N4-C28, C41-N5-C42, and C44-N6-C45) are 122.4(9) -127.4(10)°, supporting the presence of a bonded hydrogen atom. 6,10 The O1-C1, O3-C17, O4-C18, O6-C34, O7-C35, and O9-C51 (1.232(12) -1.324(11)Å) bond lengths are a little shorter than the usual C(aromatic)-O bond lengths (average 1.362(15)Å). 9 The C-O shortening and the variation of the C-C distances of the phenolate aromatic rings suggest some contribution of a quinoid-like structure for the phenolate rings.…”

“…6 In each Schiff-base molecule, there are intramolecular hydrogen bonds between imino-nitrogen and phenolato-oxygen atoms and 3), similar to the case for H2salpr. 10…”