Pd(II) and Zn(II) Based Complexes with Schiff Base Ligands: Synthesis, Characterization, Luminescence, and Antibacterial and Catalytic Activities

Abstract

Two new metal complexes involving Schiff base ligands, namely, [Pd(L1)2] (1) and [Zn(L2)2] (2), [HL1: 2,4-dibromo-6-((E)-(mesitylimino)methyl)phenol and HL2: 2-((E)-(2,6-diisopropylphenylimino)methyl)-4,6-dibromophenol], have been solvothermally synthesized and characterized by elemental analysis, IR-spectroscopy, thermogravimetric analysis, powder X-ray diffraction, and single-crystal X-ray diffraction. Both 1 and 2 are mononuclear cyclometalated complexes with square planar and tetrahedral coordination geometry, respectively. 1 and 2 display photoluminescence in the solid state at 298 K (fluorescence lifetimes τ = 5.521 μs at 508 nm for 1; τ = 3.697 μs at 506 nm for 2). These Schiff base ligands and their metal complexes have been screened for antibacterial activity against several bacteria strains, and the results are compared with the activity of penicillin. Moreover, the Suzuki reaction of 4-bromoanisole with phenylboronic acid by 1 has also been studied.

Novel azomethine Pd (II)‐ and VO (II)‐based metallo‐pharmaceuticals as anticancer, antimicrobial, and antioxidant agents: Design, structural inspection, DFT investigation, and DNA interaction

“…[27,28,[30][31][32]37] Compared with those of old researches, the activities of the tested palladium complex are higher than others. [52][53][54] Activity index A ð Þ ¼ Inhibition zone of complex mm ð Þ Inhibition zone of standard drug mm ð Þ × 100:…”

“…The results suggest that all the metal-imine complexes intercalate with the adjacent base pairs, thereby causing lengthening of the DNA helix, which facilitates the intercalation mode of CT-DNA with the as-prepared metal-imine complexes. [28,37,[53][54][55][56]…”

Crystal structure of bis{2-[(E)-(4-fluorobenzyl)iminomethyl]phenolato-κ2N,O}nickel(II)

“…Schiff base ligands are well-known and important compounds because of their wide range of biological activities and uses in industrial systems (Feng et al, 2013;Kumar et al, 2010;Liu et al, 2005) as well as being versatile ligands for transition metals. Transition metal complexes with Schiff base ligands, especially those of Pd II and Ni II , have been shown to display a variety of structural features and, in some cases, exhibit interesting reactivity.…”

Efficient Catalytic Reduction of 4-Nitrophenol Using Copper(II) Complexes with N,O-Chelating Schiff Base Ligands

“…Schiff bases are versatile ligands and have been employed extensively as chelating agents in coordination chemistry, as they readily form stable complexes with most of the transition metals. Previous studies have reported the use of Schiff bases and their corresponding metal complexes in numerous applications, such as catalytic [ 1 , 2 , 3 ] luminescence [ 4 , 5 ], and antimicrobial [ 6 , 7 , 8 ] activities. Owing to their structural diversity and simple preparation methods, various Schiff base ligands have been synthesized and studied, with the aim to expand their potential in a variety of applications.…”