Two new vanadyl complexes of N-confused porphyrins (NCPs), [VONCTPP] () and [VONCP(OMe)] (), have been synthesized for the first time and investigated as a catalyst for the oxidative bromination reaction of phenol and its derivatives. This article further delineates crystal structures, photophysical, and redox properties of both the vanadyl complexes. Complexes and exhibited a significant red shift in their absorption spectra compared with their respective free bases. The single-crystal structure of revealed that the complex is in the 2H tautomeric form, while EPR studies revealed the +4 oxidation state of vanadium metal having an axial compression with d configuration. Catalytic potential for -like activity has been explored for both complexes and for the first time in NCP chemistry with excellent TOF values (4.7-6.3 s for and 7.3-8.7 s for ) using KBr as a source of bromine and HO as a green oxidant in aqueous acidic medium at 298 K. Notably, both catalysts show excellent recyclability over five cycles. The vanadyl-metalated NCPs exhibit excellent stability in the air.
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http://dx.doi.org/10.1021/acs.inorgchem.4c01222 | DOI Listing |
Biol Trace Elem Res
January 2025
College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.
Exposure to vanadium (V) occurs through the ingestion of contaminated water, polluted soil, V-containing foods and medications, and the toxicity and absorption during the small intestine phase after oral ingestion play crucial roles in the ultimate health hazards posed by V. In this study, the human colon adenocarcinoma (Caco-2) cells were selected as an intestinal absorption model to investigate the uptake and cytotoxicity of vanadyl sulfate (VOSO) and sodium orthovanadate (NaVO). Our results confirmed the cytotoxic effects of V(IV) and V(V) and revealed a greater toxicity of V(IV) than V(V) towards Caco-2 cells.
View Article and Find Full Text PDFDalton Trans
November 2024
Dipartimento di Scienze Chimiche e Geologiche e UdR INSTM, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy.
First prepared in the late 70s, the pro-ligand 1,3-bis(3,5-dioxo-1-hexyl)benzene (Hbdhb) contains two acetoacetyl terminations linked to a central 1,3-phenylene unit through dimethylene bridges. Since each termination can be either in diketonic or keto-enolic form, in organic solution it exists as a mixture of three spectroscopically resolvable tautomers. In the presence of pyridine, Co and the bdhb anion form a crystalline dimeric compound with formula [Co(bdhb)(py)] (2) and a Co⋯Co separation of more than 11 Å.
View Article and Find Full Text PDFDiabetes Metab Syndr Obes
September 2024
School of Laboratory Medicine and Medical Science, University of Kwazulu-Natal, Durban, South Africa.
The prevalence of diabetes mellitus and diabetes-related complications is rapidly increasing worldwide, placing a substantial financial burden on healthcare systems. Approximately 537 million adults are currently diagnosed with type 1 or type 2 diabetes globally. However, interestingly, the increasing morbidity rate is primarily influenced by the effects of long-term hyperglycemia on vital organs such as the brain, the liver and the heart rather than the ability of the body to use glucose effectively.
View Article and Find Full Text PDFJ Am Chem Soc
September 2024
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
Phys Chem Chem Phys
August 2024
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA.
Here, we employed the nudged elastic band (NEB) method to simulate the diffusion of ferrocene through vanadyl phosphate (VOPO), with a focus on understanding the diffusion pathways arising from the complex structure of ferrocene. We systematically evaluated a total of 36 potential diffusion paths, categorizing them into three groups based on their directional orientation: 15 paths between V sites along the [110] direction, 15 paths from V to P sites along the [100] direction, and 6 paths between P sites also along the [110] direction. Our analysis revealed that the energy barriers for diffusion along the [110] direction typically ranged between 0.
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