Publications by authors named "J K Blakemore"
Both cyclic "crown" and acyclic "tiara" polyethers have been recognized as useful for the binding of metal cations and enabling the assembly of multimetallic complexes. However, the properties of heterobimetallic complexes built upon acyclic polyethers have received less attention than they deserve. Here, the synthesis and characterization of a family of eight redox-active heterobimetallic complexes that pair a nickel center with secondary redox-inactive cations (K, Na, Li, Sr, Ca, Zn, La, and Lu) bound in acyclic polyether "tiara" moieties are reported.
View Article and Find Full Text PDFInterconversion of the oxidation states of uranium enables separations and reactivity schemes involving this element and contributes to technologies for recycling of spent nuclear fuels. The redox behaviors of uranium species impact these processes, but use of electrochemical methods to drive reactions of molecular uranium complexes and to obtain molecular insights into the outcomes of electrode-driven reactions has received far less attention than it deserves. Here, we show that electro-reduction of the uranyl ion (UO) can be used to promote stepwise functionalization of the typically unreactive oxo groups with exogenous triphenylborane (BPh) serving as a moderate electrophile, avoiding the conventional requirement for a chemical reductant.
View Article and Find Full Text PDFPurpose: To investigate the relationship between early serum hCG levels after frozen embryo transfer and fetal anomalies.
Methods: This was a case-control study at a single academic fertility center between 1/2010 and 12/2021, including all patients who underwent euploid frozen embryo transfers resulting in any fetal anomaly confirmed at the time of induced abortion > 10 weeks or any anomaly reported at delivery. Controls included patients with healthy live births matched for age and day/grade of embryo after euploid FET.
Article Synopsis
- * A neutral Np(VI) complex was successfully used to establish a reversible 1-electron redox couple in both protic and aprotic organic solvents, characterized through electrochemical and spectroscopic methods.
- * The research shows that hydrogen bonding with oxo groups and water stabilizes the Np(V) species, supporting the findings about the reduction process and suggesting a unique redox behavior in this system.
Article Synopsis
- Two unique polynuclear complexes of neptunium (Np) with mono-μ2-oxo structures were created through a reaction involving the neptunyl(VI) compound dissolving in methanol and the addition of a Schiff-base ligand.
- One complex forms a trimer with mixed-valent Np centers and two bridging μ2-oxos, while the other is a dimer with two Np centers and one bridging μ2-oxo.
- Studies show that an intermediate multinuclear species forms before the ligand binds to the metal, and the oxo-deficient nature of the final products results from the electron transfer and condensation reactions involved in the complex formation.