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We report the gas‐phase synthesis of stable 20‐electron carbonyl anion complexes of group 3 transition metals, TM(CO)8− (TM=Sc, Y, La), which are studied by mass‐selected infrared (IR) photodissociation spectroscopy. The experimentally observed species, which are the first octacarbonyl anionic complexes of a TM, are identified by comparison of the measured and calculated IR spectra. Quantum chemical...
The complexes OCBeCO3 and COBeCO3 have been isolated in a low‐temperature neon matrix. The more stable isomer OCBeCO3 has a very high CO stretching mode of 2263 cm−1, which is blue‐shifted by 122 cm−1 with respect to free CO and 79 cm−1 higher than in OCBeO. Bonding analysis of the complexes shows that OCBeO has a stronger OCBeY bond than OCBeCO3 because it encounters stronger π backdonation. The...
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