Frustrated Magnetism and Spin Anisotropy in a Buckled Square Net YbTaO.

The interplay between quantum effects from magnetic frustration, low-dimensionality, spin-orbit coupling, and crystal electric field in rare-earth materials leads to nontrivial ground states with unusual magnetic excitations. Here, we investigate YbTaO, which hosts a buckled square net of Yb ions with = 1/2 moments. The observed Curie-Weiss temperature is about -1 K, implying an antiferromagnetic coupling between the Yb moments.

Exploring Charge Redistribution at the Cu/CoSe Interface.

This study investigates the electronic interactions and charge redistribution at the dopant-support interface using a Cu/CoSe cluster construct. Specifically, the redox cluster series [CuCoSeL] ([-Cu]; = 0, -1, -2, -3; L = PhPNTol, Ph = phenyl, Tol = -tolyl) spanning four distinct oxidation states is synthesized and characterized using a multitude of techniques, including multinuclear NMR, UV-vis, XANES, and X-ray crystallography. Structural investigations indicate that the clusters are isostructural and chiral, adopting a pseudo- symmetry.

Proton-Coupled Electron Transfer at the Pu Couple.

The synthesis and solution and solid-state characterization of [Pu(NPC)], , (NPC = [NPBu(pyrr)]; Bu = C(CH); pyrr = pyrrolidinyl) and [Pu(NPC)][K(2.2.2.

A Four-Coordinate Pr Imidophosphorane Complex.

The imidophosphorane ligand, [NPBu] (Bu=tert-butyl), enables isolation of a pseudo-tetrahedral, tetravalent praseodymium complex, [Pr(NPBu)] (1-Pr), which is characterized by a suite of physical characterization methods including single-crystal X-ray diffraction, electron paramagnetic resonance, and L-edge X-ray near-edge spectroscopies. Variable-temperature direct-current magnetic susceptibility data, supported by multiconfigurational quantum chemical calculations, demonstrate that the electronic structure diverges from the isoelectronic Ce analogue, driven by increased crystal field. The four-coordinate environment around Pr in 1-Pr, which is unparalleled in reported extended solid systems, provides a unique opportunity to study the interplay between crystal field splitting and spin-orbit coupling in a molecular tetravalent lanthanide within a pseudo-tetrahedral coordination geometry.

Semisynthetic derivatives of the fungal metabolite eupenifeldin via targeting the tropolone hydroxy groups.

Eupenifeldin (1) is a fungal secondary metabolite possessing bis-tropolone moieties that demonstrates nanomolar cytotoxic activity against a number of cancer cell types. As a potential anticancer lead, this meroterpenoid was used to access 29 semisynthetic analogues via functionalization of the reactive hydroxy groups of the bis-tropolones. A series of ester (2-6), carbonate (7-8), sulfonate (9-16), carbamate (17-20), and ether (21-30) analogues of 1 were generated via 22 reactions.