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            Y and Nd borohydride complexes bearing 2-pyridinemethanamido ligands were synthesized, revealing a varied coordination chemistry. Nine structures were identified by X-ray diffraction, some complexes being active in the ROP of cyclic esters.more » « lessFree, publicly-accessible full text available January 21, 2026
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            To advance our ability to control the electronic properties of divalent lanthanides, the interplay between deformation densities, 4f interelectronic repulsion, and ligand field effects is discussed to predict the nature of their ground states.more » « lessFree, publicly-accessible full text available January 22, 2026
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            Treatment of the scandium(II) metallocene Cpttt2Sc (Cpttt = C5H2tBu3) with CO or the isocyanide CNXyl (Xyl = C6H3Me2-2,6) yields the carbonyl complex Cpttt2Sc(CO), 1, or the isocyanide complex Cpttt2Sc(CNXyl), 2, which were identified by X-ray crystallography. Isotopic labeling with 13CO shows the CO stretch of 1 at 1875 cm−1 shifts to 1838 cm−1 in 1-13CO. The CN stretch in 2 is shifted to 1939 cm−1 compared to 2118 cm−1 for the free isocyanide. The 80.1 MHz (28.7 G) 45Sc hyperfine coupling in 1 and 74.7 MHz (26.8 G) in 2 are similar to the 82.6 MHz (29.6 G) coupling constant in Cpttt2Sc and indicate that 1 and 2 are Sc(II) complexes. A comprehensive analysis of the electronic structures of 1 and 2 using DFT calculations is reported.more » « less
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