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Smart/intelligent contrast agent candidates for MRI based on Mn(II) ion are rare, as it usually forms labile complexes with polyaminocarboxylate-type ligands. Here, we report the first example of a Mn(II) complex that can be activated by changing the pH of its local environment. The PC2A-EA ligand with an ethylamine pendant arm was found to form a thermodynamically stable (log = 19.01, pMn = 9.27) and kinetically inert complex with Mn(II) with respect to -chelation with a metal ion such as Cu(II). The [MnH(PCA2-EA)] complex displays a relatively slow water exchange rate ((4.0 ± 0.2) × 10 s), but the pH-dependent coordination of the ethylamine moiety occurs in the pH range of 6-8 (log = 6.88), enabling the complex to exhibit pH-sensitive relaxivity in the biologically relevant pH range.
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http://dx.doi.org/10.1021/jacs.9b09407 | DOI Listing |
Environ Sci Technol
December 2024
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou 510006, China.
Natural self-purification of water is limited by mass transfer processes between inert oxygen (O) and stable pollutants. This process must rely on large energy inputs and resource consumption, which have become a global challenge in the environmental field. Here, we greatly amplify this self-purification effect of natural dissolved oxygen (DO) by nonexpendable HO triggering a DRC catalyst with a micro-potential difference surface.
View Article and Find Full Text PDFTalanta
December 2024
Department of Chemistry, Sapienza University of Rome, 00185, Rome, Italy.
Microplastics are mostly inert particles and, therefore, may exhibit low toxicity, but adverse health effects may result from chemical additives commonly added to plastics. Plastic additives serve to make the material workable and thermodynamically stable as well as acting as softeners, fillers and colorants. They may include hazardous chemicals, such as organic phosphates, phthalates, terephthalates, adipates, benzoates, citrates, sebacates, trimellitates, etc.
View Article and Find Full Text PDFJ Clin Monit Comput
December 2024
Pediatric perioperative medicine and Intensive Care, Karolinska University Hospital, Eugeniavägen 23, Stockholm, 171 64, Sweden.
Purpose: The capnodynamic method, End Expiratory Lung Volume CO (EELV-CO), utilizes exhaled carbon dioxide analysis to estimate End-Expiratory Lung Volume (EELV) and has been validated in both normal lungs and lung injury models. Its performance under systemic hypoxia and variations in CO elimination is not examined. This study aims to validate EELV-CO against inert gas wash in/wash out (EELV- SF6, sulfur hexafluoride) in a porcine model of stable hemodynamic conditions followed by hypoxic pulmonary vasoconstriction and inhaled nitric oxide (iNO).
View Article and Find Full Text PDFChem Sci
December 2024
Key Laboratory of Chemical Biology and Traditional Chinese Medicine, Ministry of Educational of China, Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University Changsha 410081 China
Sub--benziporphyrins were synthesized by Pd-catalyzed cross-coupling of ,'-diboryl--benzitripyrrane with 9,10-bis(1,1-dibromomethylenyl)anthracene. Reaction of sub--benziporphyrin with PhBCl and triethylamine gave its B-phenyl complex as a tetracoordinate nonaromatic B complex. In contrast, the reaction with BBr and triethylamine furnished a neutral B porphyrinoid with a planar and triangular coordination as the first example, in which the -phenylene unit was partially reduced, allowing for the global 14π-aromatic circuit.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Laboratory of Advanced Materials, Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200438, China.
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