The challenge of cyclic and acyclic schiff bases and related derivatives

Copper(II) complexes of coumarin-derived Schiff bases and their anti-Candida activity

“…Coordination of the Cu(II) centre to both ligands is via the imine nitrogen and phenolic oxygen atoms. Bond lengths between the Cu(II) centre and the donor atoms are consistent with previously reported compounds of similar structures [54,67]. There is no centre of symmetry in the molecule which is reflected particularly in the bond length differences between copper and each of the nitrogen atoms of the two ligands coordinated to it; 1.973 (5) (Fig.…”

“…3) shows a mononuclear Cu(II) centre bound to two Schiff base ligands. The bond lengths and angles (Table 9) suggest a distorted square planar coordination environment for the metal [67]. Coordination of the Cu(II) centre to both ligands is via the imine nitrogen and phenolic oxygen atoms.…”

“…Therefore, each Cu(II) centre is bound to three Schiff base ligands with a different coordination mode to each ligand. Each Cu(II) ion is primarily in a coordination environment that may be considered as intermediate between distorted trigonal bipyramidal and a square pyramidal [66,67]. The copper ions are bridged by the two phenolic oxygen atoms with a short copper-copper distance of 2.61 (5) Å A 0 and a Cu-O6-Cu angle of 103.69 (5)°.…”

The Supramolecular Attitude of Metal–Salophen and Metal–Salen Complexes

“…Salophens (N,N-bis(salicylidene)phenylenediamine) and salens (N,N-bis(salicylidene) ethylenediamine) are classes of organic compounds extensively used as ligands in coordination chemistry [1]. They represent one of the oldest category of ligands, the first salen complex being described by Pfeiffer et al in 1933 [2].…”

Synthesis and antimicrobial activity of new Schiff bases containing coumarin moiety and their spectral characterization

“…Schiff bases form a significant class of compounds in medicinal and pharmaceutical chemistry with several biological applications that include antibacterial, [1][2][3][4][5][6] antifungal [3][4][5][6] and antitumor activity. [7][8] They have been studied extensively as a class of ligands [9][10][11] and are known to coordinate with metal ions through the azomethine nitrogen atom.…”