Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna Bizerte, Tunisia.
Published: October 2013
AI Article Synopsis
Article Abstract
The asymmetric unit of the title compound, (C8H12NO)2[Mn(H2P2O7)2(H2O)2]·2H2O, consists of half an Mn(II) complex anion, a 2-meth-oxy-benyl-ammonium cation and a solvent water mol-ecule. The Mn(II) complex anion lies across an inversion center, and has a slightly distorted octa-hedral coordination environment for the Mn(II) ion, formed by two bidentate dihydrogendiphosphate ligands and two water mol-ecules. In the crystal, the components are linked by O-H⋯O and N-H⋯O hydrogen bonds, forming layers parallel to (100). An intra-molecular N-H⋯O hydrogen bond is also observed.
The article reports a hitherto-unknown aromatic proton transfer (APT) to the o-amine function chelated to manganese(II) ion and disintegration of the molecule generating an aryne intermediate. The reaction of (NQ)-NH(AQ) (o-HLH) with manganese(II) acetate in boiling DMF generates [MnII(o-HL-)2], where the o-HLH ligands undergo disintegration forming manganese(II) complexes of AQ and an 1,4- naphthoquinonyne intermediate based on benzoquinone ring, that has been defined as [NQ-2H] (NQ and AQ abbreviate respectively 1,4-naphthoquinone and 8-aminoquinoline fragments). The disintegration reaction of o-HLH depends on the metal precursor used, solvent and temperature.
Context: Isatin-Schiff bases have wide applications in chemistry. The π conjugated electronic system and heterocylic structure of these materials make them valuable for use as photosensitized materials. The delocalization of π-electrons throughout the structure causes the UV-vis absorption spectra to shift to longer wavelengths.
School of Resources and Environment, Wuhan Textile University, Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China; State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China E-mail:
Engineered nanomaterials are widely used in water and wastewater treatment processes, and minimizing their adverse effects on biological treatment processes in wastewater treatment plants has become the primary focus. In this study, activated carbon fiber (ACF)-loaded manganese oxide nanomaterials (MnOx@ACF) were synthesized. A small-scale sequencing batch reactor (SBR) was constructed to simulate the synergistic degradation of pollutants by nanomaterials and microorganisms and the effects of nanomaterials on the structure of the microbial community in a wastewater treatment plant.
Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China.
First-row transition metals, like Mn(II), play a significant role in acceptorless dehydrogenative coupling reactions, making it important to study their catalytic mechanisms for better catalyst design.
This research utilized density functional theory (DFT) to analyze a novel dehydrogenation pathway involving a high-spin Mn(II) complex, where an external base (KOH) interacts with the metal center for the reaction.
The study identified the hydride transfer as the rate-determining step with an energy barrier of 26.3 kcal/mol, while also highlighting how factors like small steric hindrance and strong orbital interactions of KOH influence the reaction's selectivity.
The study demonstrated that nitrilotriacetic acid (NTA) enhances the removal of sulfamethoxazole (SMX) when used with manganese (Mn(II)) and peracetic acid (PAA).
It was found that NTA forms a complex with Mn(II), which helps activate PAA, leading to the production of reactive species that degrade SMX.
The research identified four degradation pathways for SMX and suggested that the reaction is most effective under acidic to neutral conditions, with higher concentrations of PAA, Mn(II), or NTA improving the degradation process.
