Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Synthesis and crystal structure of the disordered modification of Tl 6Si2O7. / Siidra, O. I.; Britvin, S. N.; Krivovichev, S. V.; Klimov, D. A.; Depmeier, W.
в: Glass Physics and Chemistry, Том 38, № 6, 11.2012, стр. 473-477.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Synthesis and crystal structure of the disordered modification of Tl 6Si2O7
AU - Siidra, O. I.
AU - Britvin, S. N.
AU - Krivovichev, S. V.
AU - Klimov, D. A.
AU - Depmeier, W.
PY - 2012/11
Y1 - 2012/11
N2 - A new compound β-Tl6Si2O7 has been investigated using the methods of IR spectroscopy and microprobe and X-ray diffraction analysis. The elementary unit parameters were as follows: P6 3/m, a = 9.673(2) Å, c = 3.9169(9) Å, and V = 317.4(1) Å3. The structure was resolved by direct methods and corrected until R 1 = 0.029 (wR 2 = 0.047) for 240 reflections [F o] ≥ 4σ F . The crystal structure of β-Tl6Si2O7 contains one symmetrically independent position of the Tl+ cation that forms three short (Tl-O = 2.54 Å) bonds and one weak bond (2.93 Å) with the oxygen atom. One can observe a strong disordering of silicon atoms (Si-Si = 0.64 Å). The distorted tetragonal pyramids TlO4 are linked through silicate tetrahedra into a three-dimensional framework. The interesting feature of the crystal structure of β-Tl6Si2O7 is in the presence of wide channels occupied by lone electron pairs on Tl+ cations. One can also mention that in most of the structures of Tl+ oxygen-containing salts the lone pairs are associated into separate parts in the form of micelles in channels of frameworks or other structural cavities.
AB - A new compound β-Tl6Si2O7 has been investigated using the methods of IR spectroscopy and microprobe and X-ray diffraction analysis. The elementary unit parameters were as follows: P6 3/m, a = 9.673(2) Å, c = 3.9169(9) Å, and V = 317.4(1) Å3. The structure was resolved by direct methods and corrected until R 1 = 0.029 (wR 2 = 0.047) for 240 reflections [F o] ≥ 4σ F . The crystal structure of β-Tl6Si2O7 contains one symmetrically independent position of the Tl+ cation that forms three short (Tl-O = 2.54 Å) bonds and one weak bond (2.93 Å) with the oxygen atom. One can observe a strong disordering of silicon atoms (Si-Si = 0.64 Å). The distorted tetragonal pyramids TlO4 are linked through silicate tetrahedra into a three-dimensional framework. The interesting feature of the crystal structure of β-Tl6Si2O7 is in the presence of wide channels occupied by lone electron pairs on Tl+ cations. One can also mention that in most of the structures of Tl+ oxygen-containing salts the lone pairs are associated into separate parts in the form of micelles in channels of frameworks or other structural cavities.
KW - lone electron pair
KW - silicates
KW - thallium
KW - thallium oxosalts
KW - X-ray structural analysis
UR - http://www.scopus.com/inward/record.url?scp=84871658560&partnerID=8YFLogxK
U2 - 10.1134/S1087659612060053
DO - 10.1134/S1087659612060053
M3 - Article
AN - SCOPUS:84871658560
VL - 38
SP - 473
EP - 477
JO - Glass Physics and Chemistry
JF - Glass Physics and Chemistry
SN - 1087-6596
IS - 6
ER -
ID: 9144877