Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O)
The boron-rich boron sub-oxide rhombohedral B<sub>6</sub>O considered in B<sub>12</sub>O<sub>2</sub> full formulation has a large O-O spacing of ~3 Å and a central vacant position that can receive interstitial atoms X, forming a central O-X-O alignment in the dode...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/1/123 |
| _version_ | 1797543196169863168 |
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| author | Samir F. Matar Jean Etourneau |
| author_facet | Samir F. Matar Jean Etourneau |
| author_sort | Samir F. Matar |
| collection | DOAJ |
| description | The boron-rich boron sub-oxide rhombohedral B<sub>6</sub>O considered in B<sub>12</sub>O<sub>2</sub> full formulation has a large O-O spacing of ~3 Å and a central vacant position that can receive interstitial atoms X, forming a central O-X-O alignment in the dodecaboron cage as observed in well-known triatomic B<sub>12</sub> compounds as B<sub>12</sub>{C-C-C}, B<sub>12</sub>{N-B-N}, etc. Plane wave density functional theory (DFT) based calculations of unrestricted geometry relaxation of B<sub>12</sub>{O-X-O}, X = B, C, N, and O let one identify new ternary sub-oxides, all found cohesive while showing different d(X-O) distances ranging from d(B-O) = 1.95 Å down to d(O-O) = 1.73 Å with intermediate d(C-O) = 1.88 Å. The different magnitudes were assigned to the chemical affinities of X-inserts versus host oxygen with the increasing development of X-O bonding along the series with larger cohesive B<sub>12</sub>{O-O-O}. From the atom projected charge density, B presents none, while significant magnitudes are shown on C and N, the latter developing bonding with terminal oxygen atoms especially N. The presence of unpaired valence electrons leaves nonbonding charge density on X = C, N interstitial compounds, which, besides the relative isolation of the central C and N lead to the onset of magnetic moments: M(C) = 1.9 μ<sub>B</sub>, and M(N) = 1 μ<sub>B</sub> in a ferromagnetic ground state. Atom-resolved assessments are provided with the magnetic charge density and electron localization function electron localization function (ELF) projections on one hand and the site and spin projected density of states and the chemical bonding based on the overlap integral S<sub>ij</sub> within the COOP criterion, on the other hand. |
| first_indexed | 2024-03-10T13:42:10Z |
| format | Article |
| id | doaj.art-f48bf430c96942b380afdf4d54316301 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T13:42:10Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-f48bf430c96942b380afdf4d543163012023-11-21T03:00:22ZengMDPI AGMolecules1420-30492020-12-0126112310.3390/molecules26010123Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O)Samir F. Matar0Jean Etourneau1Lebanese German University, Sahel-Alma, Jounieh 1200, LebanonUniversity of Bordeaux, ICMCB-CNRS, 33600 Pessac, FranceThe boron-rich boron sub-oxide rhombohedral B<sub>6</sub>O considered in B<sub>12</sub>O<sub>2</sub> full formulation has a large O-O spacing of ~3 Å and a central vacant position that can receive interstitial atoms X, forming a central O-X-O alignment in the dodecaboron cage as observed in well-known triatomic B<sub>12</sub> compounds as B<sub>12</sub>{C-C-C}, B<sub>12</sub>{N-B-N}, etc. Plane wave density functional theory (DFT) based calculations of unrestricted geometry relaxation of B<sub>12</sub>{O-X-O}, X = B, C, N, and O let one identify new ternary sub-oxides, all found cohesive while showing different d(X-O) distances ranging from d(B-O) = 1.95 Å down to d(O-O) = 1.73 Å with intermediate d(C-O) = 1.88 Å. The different magnitudes were assigned to the chemical affinities of X-inserts versus host oxygen with the increasing development of X-O bonding along the series with larger cohesive B<sub>12</sub>{O-O-O}. From the atom projected charge density, B presents none, while significant magnitudes are shown on C and N, the latter developing bonding with terminal oxygen atoms especially N. The presence of unpaired valence electrons leaves nonbonding charge density on X = C, N interstitial compounds, which, besides the relative isolation of the central C and N lead to the onset of magnetic moments: M(C) = 1.9 μ<sub>B</sub>, and M(N) = 1 μ<sub>B</sub> in a ferromagnetic ground state. Atom-resolved assessments are provided with the magnetic charge density and electron localization function electron localization function (ELF) projections on one hand and the site and spin projected density of states and the chemical bonding based on the overlap integral S<sub>ij</sub> within the COOP criterion, on the other hand.https://www.mdpi.com/1420-3049/26/1/123<i>p</i>-magnetismboron sub-oxideinterstitial atomsDFTDOSELF |
| spellingShingle | Samir F. Matar Jean Etourneau Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) Molecules <i>p</i>-magnetism boron sub-oxide interstitial atoms DFT DOS ELF |
| title | Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) |
| title_full | Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) |
| title_fullStr | Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) |
| title_full_unstemmed | Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) |
| title_short | Electronic and Magnetic Structures of New Interstitial Boron Sub-Oxides B<sub>12</sub>O<sub>2</sub>:X (X = B, C, N, O) |
| title_sort | electronic and magnetic structures of new interstitial boron sub oxides b sub 12 sub o sub 2 sub x x b c n o |
| topic | <i>p</i>-magnetism boron sub-oxide interstitial atoms DFT DOS ELF |
| url | https://www.mdpi.com/1420-3049/26/1/123 |
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