Triazine based Mn (II) and Mn (II)/Ln (III) complexes: Synthesis, characterization and catecholase activities

Abstract

In the current work, two triazine‐based multidentate ligands (H2L1 and H2L2) and their homo‐dinuclear Mn (II), mononuclear Ln (III) and hetero‐dinuclear Mn (II)/Ln (III) (Where Ln: Eu or La) complexes were synthesized and characterized by spectroscopic and analytical methods. Single crystals of a homo‐dinuclear Mn (II) complex {[Mn (HL1)(CH3OH)](ClO4·CH3OH}2 (1) were obtained and the molecular structure was determined by X‐ray diffraction method. In the structure of the complex, each Mn (II) ion is seven‐coordinate and one of the phenolic oxygen bridges two Mn (II) centre forming a dimeric structure. The UV–Vis. and photoluminescence properties of synthesized ligands and their metal complexes were investigated in DMF solution and the compounds showed emission bands in the UV–Vis. region. The catecholase enzyme‐like activity of the complexes were studied for 3,5‐DTBC → 3,5‐DTBQ conversion in the presence of air oxygen. Homo‐dinuclear Mn (II) complexes (1 and 4) were found to efficiently catalyse 3,5‐DTBC → 3,5‐DTBQ conversion with the turnover numbers of 37.25 and 35.78 h−1 (kcat), respectively. Mononuclear Eu (III) and La (III) complexes did not show catecholase activity.

s‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications

“…The catalyst 330 proved to be efficiently catalyze the oxidation of 3,5-DTBC (3,5-di-tert-butylcatechol) to the corresponding benzoquinone (3,5-DTBQ) with turnover number of 37.25 and 35.78 h À1 (kcat), respectively. [198] Al-Khodir et al synthesized a set of polydentate striazine core ligands 331-334 and their Pd(IV) and Pt(IV) complexes 335-342 (Figures 13 and 14). The synthesized complexes were tested as antimicrobial agents against different strains including E. coli (GÀ), S. aureus (G+), C. albicans, and A. flavus.…”

A Series of High‐nuclear 3d‐4f (FeIII8LnIII2) Complexes: Syntheses, Structures, and Magnetic Properties

“…In the past decades, the polynuclear 3 d ‐4 f heterometallic complexes have become a hot topic in coordination chemistry and material chemistry, due to their aesthetically pleasing structures and potential applications in magnetism, luminescence and catalysis so on . In particular, many 3 d ‐4 f complexes behave as single‐molecule magnets (SMMs), which feature slow relaxation of magnetization and magnetic hysteresis under the blocking temperature and can be potential candidates for novel molecular‐magnetic materials, such as information storage devices, quantum computing, and spintronics devices . Since the first SMM‐[Mn 12 ] was reported in 1990s, the initial study is mostly focused on transition‐metal SMMs with a large spin state ( S ) .…”