The effect of substituted nicotinamides and isonicotinamides and Pt(IV) metal complexes based on the substituted nicotinamides and isonicotinamides on the activity of cAMP phosphodiesterase was studied. Isonicotinamide derivatives are efficient enzyme activators, whereas substituted nicotine amides are inhibitors of enzymatic cAMP phosphodiesterase activity; their inhibitory potency is comparable to that of theophylline used as a reference drug.
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Molecules
January 2025
Department of Inorganic Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 2, 20-031 Lublin, Poland.
Owing to the intensive development of electrical and electronic equipment, there is an increasing demand for precious metals, which are often used for its production. Due to their scarce supply, it is important to recover them from secondary sources. A promising way to recover precious metals are impregnated resins.
View Article and Find Full Text PDFChemistry
January 2025
The University of British Columbia, Department of Chemistry, 2036 Main Mall, V6T 1Z1, Vancouver, CANADA.
The field of platinum chemistry is ubiquitous in the research of anticancer drugs and new OLED materials. Within the vast library of existing compounds, the majority of work focuses on complexes in the +2 and +4 oxidation states, with comparatively few examples of PtIII complexes reported without bridging ligands. PtIII complexes with metal-metal bonding can be made by mild oxidation of PtII complexes having bis(phenylpyridine) ligands.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Department of Chemistry, Brandon University, 270 18th Street, Brandon, Manitoba R7A 6A9, Canada.
Aerobic oxidation of a dimethylplatinum(II) complex featuring 1,1-di(2-pyridyl)ethanol as a supporting ligand leads to the formation of two unexpected Pt complexes (in ∼1:1 ratio), neither of which results from direct oxidation typical for Pt centers supported by popular κ-(,) ligands. While one product features an isomerized Pt center stabilized by the κ-(,,) ligand coordination mode, surprisingly, the other product results from intramolecular activation of the ligand methyl fragment. Mechanistic studies, reactivity of model complexes, and DFT calculations reveal that the critical proton-responsive nature of the ligand allows formation of intermediates that result in a concerted metalation deprotonation (CMD)-like C-H activation at Pt.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
October 2024
Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.
Post-synthetic modification of mechanically interlocked molecules (MIMs) is an attractive avenue to add complexity to already intricate systems. This remains an important, challenging topic that is under-developed. In this paper, we report the synthesis and characterization of a [2]rotaxane molecule featuring a ring appended to an emissive cyclometalated Pt unit.
View Article and Find Full Text PDFChem Sci
October 2024
Universität Münster, Institut für Anorganische und Analytische Chemie Corrensstraße 28/30 48149 Münster Germany
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