Publications by authors named "Ziad Shafi"
We report the gas-phase preparation, isolation, and reactivity of a series of organolanthanides featuring the Ln-CH bond. The complexes are formed by decarboxylating anionic lanthanide acetates to form trivalent [Ln(CH)(CHCO)] (Ln = La, Ce, Pr, Nd, Sm, Tb, Tm, Yb, Lu), divalent [Eu(CH)(CHCO)], and the first examples of tetravalent organocerium complexes featuring Ce-C σ-bonds: [Ce(O)(CH)(CHCO)] and [Ce(O)(CH)(NO)]. Attempts to isolate Pr-CH and Tb-CH were unsuccessful; however, fragmentation patterns reveal that the oxidation of Ln to a Ln-oxo-acetate complex is more favorable for Ln = Pr than for Ln = Tb.
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- The study investigates lanthanide-oxide nitrate complexes, specifically [Ln(O)(NO)], formed from trivalent lanthanide nitrates by eliminating NO.
- These complexes exhibit varying types of Ln-O bonding (oxyl and oxo) based on the accessibility of the tetravalent state of the lanthanides.
- It is discovered that praseodymium (PrO) showcases slower reactivity compared to terbium (TbO), indicating a more stable oxo bond in Pr, which is a unique finding in the context of their comparative chemical properties.