Metal Complexes: Preparation, Magnetic, Spectral, and Biocidal Studies of Some Mixed‐Ligand Complexes with Schiff Bases Containing NO and NN Donor Atoms

Abstract

Metal complexes of the types [M(SB 1 ) 2 acphen] and [M(SB 2 ) 2 acphen] where M ¼ Mn(II), Co(II), Ni(II), Cu(II), and Cd(II); HSB 1 ¼ 5-chlorosalicylidene-p-anisidine and HSB 2 ¼ 5-bromosalicylidene-panisidine have been prepared and characterized. Magnetic susceptibility measurements, elemental analyses, electro-nic, and infrared spectral data suggest six-coordinated octahedral structures for these complexes. The mixed-ligand complexes show higher activity against Saccharomyces cereuisae, Salmonella typhi, Fasarium oxysporum, 553 ORDER REPRINTSand Lasiodiplodia theobromae as compared to the ligand, metal salts, and control.

Metal‐Based Antibacterial and Antifungal Agents: Synthesis, Characterization, and In Vitro Biological Evaluation of Co(II), Cu(II), Ni(II), and Zn(II) Complexes with Amino Acid‐Derived Compounds

“…These results exhibited markedly an enhancement in activity on coordination with the metal ions against one or more testing bacterial strains. This enhancement in the activity is rationalized on the basis of the structures of, ()–() by possessing an additional azomethine (C=N) linkage which imports in elucidating the mechanism of transamination and resamination reactions in biological system [53, 54]. It has also been suggested [55–65] that the ligands with nitrogen and oxygen donor systems might inhibit enzyme production, since the enzymes which require these groups for their activity appear to be especially more susceptible to deactivation by the metal ions upon chelation.…”

Synthesis, Structural, and Antimicrobial Studies of Some New Coordination Compounds of Palladium(II) with Azomethines Derived from Amino Acids

“…e chelation reduces the polarity [24,25] of the metal ion, mainly, because of the partial sharing of its positive charge with the donor groups and possibly the -electron delocalization within the whole chelate ring [26][27][28]. is process of chelation thus increases the lipophilic nature of the central metal atom, which in turn favours its permeation through the lipid layer of the membrane [29][30][31].…”

Synthesis, Characterization, and Crystal Structure of Di{bis[2-[(2-dimethylaminoethylimino)methyl]-6-methoxyphenolato]thiocyanatozinc(II)} Tetrakis(thiocyanato)zinc(II)

“…The selected bond lengths and bond angles are listed in Table 2 and angles related to the hydrogen bonding are listed in Table 3. X-ray single crystal analysis revealed that the compound consists of two mononuclear [Zn (C 12 0.900 (10) 2.64 (7) 3.187(8) 120(6) N(9)-H(9)· · ·O (5) 0.903(10) 1.81 (3) 2.686(7) 162(7) N(9)-H(9)· · ·O (6) 0.903 (10) 2.40 (7) 2.975(8) 122(6) N(7)-H(7A)· · ·O (7) 0.900 (10) at the basal plane, and by two imine N atoms from two Schiff bases at the apical positions. In the anion, the Zn atom is coordinated by four N atoms from four thiocyanate ligands (Zn-N = 1.937(8) -1.965(8)Å); the bond angles subtended at the Zn3 atom are range from 105.1(4) to 113.2(3) • , showing a distorted tetrahedral coordination environment.…”

“…[1][2][3][4][5][6] These complexes can be easily synthesized from simple starting materials, where the metal ions, ligands, and coordination modes are the important factors for the self-assembly processes. Thiocyanate is a versatile ligand, which acts as monodentate or bridging group with end-on or end-to-end coordination mode to form complexes with interesting structures.…”