Molecules mimicking atoms: monomers and dimers of alkali metal solvated electron precursors
文献情報
Isuru R. Ariyarathna, Filip Pawłowski, Joseph Vincent Ortiz, Evangelos Miliordos
Tetra-amino lithium and sodium complexes M(NH3)0,−4 (M = Li, Na) have one or two electrons that occupy diffuse orbitals distributed chiefly outside the M(NH3)+4 core. The lowest-energy 1s, 1p, and 1d orbitals follow Aufbau principles found earlier for beryllium tetra-ammonia complexes. Two ground state M(NH3)4 complexes can bind covalently by coupling their 1s1 electrons into a σ-type molecular orbital. The lowest excited states of the [M(NH3)4]2 species are obtained by promoting one or two electrons from this σ to other bonding or anti-bonding σ and π-type molecular orbitals. The electronic structure of solvated electron precursors provides insights into chemical bonding between super-atomic species that are present in concentrated alkali-metal–ammonia solutions.
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