2002
Commensurate and incommensurate structures of the hexabromotellurate(IV) bis {dibromodiselenate(I)} ion - [(C2H5)(n)(C6H5)(4-n)P](2)[TeBr6(Se2Br2)(2)], n=0,1
JANICKIS, Vitalijus; Marek NEČAS; Josef NOVOSAD; Michal DUŠEK; Václav PETŘÍČEK et al.Základní údaje
Originální název
Commensurate and incommensurate structures of the hexabromotellurate(IV) bis {dibromodiselenate(I)} ion - [(C2H5)(n)(C6H5)(4-n)P](2)[TeBr6(Se2Br2)(2)], n=0,1
Autoři
JANICKIS, Vitalijus; Marek NEČAS; Josef NOVOSAD; Michal DUŠEK a Václav PETŘÍČEK
Vydání
Acta Crystallographica Section B-Structural Science, Denmark, BLACKWELL MUNKSGAARD, 2002, 0108-7681
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10402 Inorganic and nuclear chemistry
Stát vydavatele
Dánsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 2.026
Označené pro přenos do RIV
Ano
Kód RIV
RIV/00216224:14310/02:00007288
Organizační jednotka
Přírodovědecká fakulta
UT WoS
Klíčová slova anglicky
CRYSTAL-STRUCTURES; SALTS
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 25. 6. 2009 11:50, doc. Mgr. Marek Nečas, Ph.D.
Anotace
V originále
Structure analysis of [(C2H5)(n)(C6H5)(4-n)P](2)[TeBr6(Se2Br2)(2)] is presented for n=1 and 0 [ hereafter (I) and (II)]. Crystal (I) has been synthesized from elemental selenium, tellurium tetrabromide, ethyltriphenylphosphonium bromide and bromine. It has a standard monoclinic structure, space group P2(1)/c, and has been solved and refined to R=0.0357 for 4803 observed X-ray reflections by traditional techniques. Crystal (II), which has been prepared from elemental selenium, tellurium tetrabromide, tetraphenylphosphonium bromide and bromine, is an incommensurately one-dimensionally modulated structure with planar monoclinic superspace group. (II) has been refined to R=0.0501 for 4247 observed reflections. The modulation of the atoms that belong to the anion switches between two different basic positions, which are described by the crenel function algorithm. The modulation of the phenyl groups is much weaker and it could be refined within the rigid-body approximation. The TeBr6 octahedron is nearly regular in both structures. The two Br atoms of the octahedron have a bond to one of the Se atoms in an Se2Br2 molecule. For (I) both bonded Br atoms are trans positioned, while for (II) they can be either trans or cis positioned. The alternations of those arrangements are caused by modulation. The point group of the anion is -1 for crystal (I) and 2/m for the average structure of crystal (II).
Návaznosti
| GA202/00/0645, projekt VaV |
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| GA203/97/0955, projekt VaV |
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| GA203/98/0676, projekt VaV |
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| GA203/99/0067, projekt VaV |
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| MSM 143100011, záměr |
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