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Transition from exohedral to endohedral geometries of anionic and neutral B4Sin (n = 4–15) clusters: quantum chemical calculations
- Source :
- Physical Chemistry Chemical Physics. 21:26154-26165
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- The growth patterns of anionic and neutral B4Sin (n = 4–15) clusters are investigated by using density functional theory (DFT) calculations combined with particle swarm optimization (CALYPSO) software. The geometries of anionic and neutral B4Sin clusters transform from exohedral to endohedral structures with the increasing cluster sizes. The B4Si14− anion size is critical for forming B4-endohedral structures for anionic clusters, while the B4Si15 neutral size is the threshold size for forming B4-endohedral structures for neutral clusters. Both anionic and neutral B4Sin (n = 4–15) clusters are primarily dominated by prism-based or bipyramid-based geometries. The global minima of anionic and neutral B4Sin clusters adopt different geometrical structures, except for anionic and neutral B4Si10. The binding energies, second-order energy differences, and incremental binding energies of B4Sin− clusters show an odd–even alternation with the growing number of Si atoms. The B atoms in B4Sin−/0 exhibit B–B single bonding and BB double bonding properties. The B atoms are found to carry more negative charges due to charge transfer from Sin frameworks to B atoms. Interestingly, the B4Si4− anion adopts a C2h symmetric bicapped tetragonal bipyramid with σ plus π double bonding characters and has the highest relative stability among the anionic clusters. The bonding interactions in B4Si4− are in the order of B–B > B–Si > Si–Si.
- Subjects :
- Materials science
Binding energy
Alternation (geometry)
General Physics and Astronomy
Charge (physics)
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Ion
Tetragonal crystal system
Crystallography
Bipyramid
Cluster (physics)
Density functional theory
Physical and Theoretical Chemistry
0210 nano-technology
Subjects
Details
- ISSN :
- 14639084 and 14639076
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Physical Chemistry Chemical Physics
- Accession number :
- edsair.doi...........2c4fea4c53e71226b58dea74fb5d78af
- Full Text :
- https://doi.org/10.1039/c9cp05044b