Engineering topics
Publications and source records attributed to Root, Harrison D..
Recent advances enabled the discovery of heterometallic molecules for many metals: main group, d-block, lanthanides, and some actinides (U, Th).
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Photochemical reduction and separation of plutonium from uranium in acidic solutions is described as a potential alternative to conventional separations that employ harsh chemical redox agents.
A synthetic method was developed that encapsulated Sc 3+ within the macrocyclic chelate, 1,4,7-triazacyclononane-1,4,7-triacetic acid (H 3 NOTA). Encapsulation of Sc 3+ by NOTA 3− was confirmed by single crystal X-ray diffraction, 45 Sc NMR spectroscopy, and DFT calculations.
The use of protonation to switch nonaromatic expanded porphyrinsto their corresponding anti-aromatic forms has not been widelyexplored. Here, we show that free-base pyriamethyrin and dipyr-iamethyrin display nonaromatic character, as inferred from NMRspectroscopic analyses, their optical properties, and theoreticalcalculations. Addition of two protons extends thep– conjugationof these amethyrin analogues and yields formally anti-aromaticsystems.