Electronic and structural features of octa-coordinated yttrium–ammonia complexes: the first neutral solvated electron precursor with eight ligands and three outer electrons

Literature Information

Publication Date 2019-01-16
DOI 10.1039/C8CP07663D
Impact Factor 3.676
Authors

Nuno M. S. Almeida, Evangelos Miliordos


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Abstract

The neutral and charged yttrium metal–ammonia complexes, [Y(NH3)8]0,±, are investigated using state-of-the-art quantum chemical calculations. The electronic structure of these complexes is described as an Y(NH3)83+ core with two, three, and four electrons orbiting in its periphery. Unlike the so far reported solvated electron precursors containing alkali, alkaline earth or first-row transition metals, yttrium complexes are the only ones which can accommodate eight ammonia ligands and up to four peripheral electrons. For the neutral species, two electrons occupy the diffuse s-type orbital (1s) and one diffuse p-type orbital (1p). For the cationic counterpart one electron is removed from the 1p orbital, while for the anion another electron is added to the 1p shell. The calculated low-lying electronic states with excitation energies up to 2.0 eV populate the 1s, 1p, and 1d outer orbitals. The first ionization energy of Y(NH3)8 is 2.74 eV and its electron affinity is 0.64 eV. The present results suggest that saturated yttrium ammonia solutions will turn into solids (liquid or expanded metals), where a grid of Y(NH3)83+ centers will be surrounded by “free” electrons.

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Contents list

2022-01-31 Front/Back Matter

DOI: 10.1039/D2AN90010F

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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