Premium
Density functional study of neutral and anionic AlO n and ScO n with high oxygen content
Author(s) -
Gutsev G. L.,
Weatherford C. A.,
Pradhan K.,
Jena P.
Publication year - 2011
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.21878
Subject(s) - delocalized electron , chemistry , density functional theory , metal , atom (system on chip) , bond length , halogen , crystallography , ion , ionization , electron affinity (data page) , ionization energy , atomic physics , computational chemistry , molecule , physics , crystal structure , alkyl , organic chemistry , computer science , embedded system
Abstract The electronic and geometrical structures of neutral and negatively charged AlO 5 , AlO 6 , AlO 7 , AlO 8 , AlO 9 , AlO 10 , AlO 11 , AlO 12 , AlO 15 , AlO 16 , and AlO 18 along with the corresponding series of ScO n and ScO n −oxides were investigated using density functional theory with generalized gradient approximation. We found that these species possess geometrically stable isomers for all values of n = 5–12, 15, 16, 18 and are thermodynamically stable for n = 5–7. The species with n = 16 are found to be octa‐dioxides M(η 1 ‐O 2 ) 8 while the species with n = 15 and 18 are penta‐ozonides (η 2 ‐O 3 )M(η 1 ‐O 3 ) 4 and hexa‐ozonides M(η 1 ‐O 3 ) 6 , respectively. Geometrical configurations of a number of the lowest total energy states of Al and Sc oxides are different. Especially, drastic differences are found for the anion AlO n −and ScO n −pairs at n = 9, 10, and 11. The ScO bonds are longer than the AlO bonds by ≈0.2 Å, which, in turn, slightly affects the corresponding interoxygen bond lengths. The charges on metal atoms are close to +2 e in both Al series and to +1.5 e in both Sc series. As an extra electron is delocalized over ligands in the presence of a large positive charge on the metal atom of the anions, the electron affinity (EA) of the neutrals along with the ionization energies of the anions are large and exceed the EAs of the halogen atoms in a number of cases. © 2011 Wiley Periodicals, Inc. J Comput Chem 2011