The crystal structure of Ca(ReO4)2 · 2H2O

Baur, W. H.; Kassner, Dethard

doi:10.1016/0022-4596(92)90167-t

Cited by 9 publications

(13 citation statements)

References 5 publications

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“…Detailed geometrical parameters of diaquacalcium rhenate(VII) at room temperature, compared with appropriate parameters at a temperature of 105 K, are listed in Table 2 (fractional coordinations and U(eq)) and Table S1 (selected bond lengths, angles and torsion angles, supplementary material). These parameters are close to those reported earlier [5][6][7] for the structure determined at room temperature.…”

Section: Resultssupporting

confidence: 91%

“…= 15 with eight molecules per unit cell (Z = 8) in the high-and lowtemperature phase. The structure determined at room temperature is close to that reported earlier [6]. Figure 1 shows -anions have a mostly regular tetrahedral geometry with an average Re-O bond length of 1.72 Å .…”

Section: Methodssupporting

confidence: 84%

“…= 15) with the unit cell parameters: a = 18.8975(2) Å , b = 7.0720(2) Å , c = 14.1910(2) Å , a = b = 90 o , c = 115.38 o and with eight molecules per unit cell (Z = 8) [6]. However, in the literature one can find that this compound crystallises in noncentrosymmetric monoclinic space group Cc [7] or C2 [8].…”

Section: Introductionmentioning

confidence: 99%

“…The calcium atoms in this structure are surrounded by eight oxygen atoms with an average Ca-O distance of *2.46 Å . The Ca 2 (H 2 O) 4 O 10 polyhedral long-chain structure is formed [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Crystal structure, phase transitions and vibrations of H2O molecules in [Ca(H2O)2](ReO4)2

Hetmańczyk

Nitek

2017

J Therm Anal Calorim

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One reversible phase transition at T h c = 261.2 K (upon heating) was observed for [Ca(H 2 O) 2 ](ReO 4 ) 2 in the 120-300 K range. Thermal hysteresis of the phase transition temperature T C of ca. 30 K and heat flow anomaly sharpness suggest that the detected phase transition is of a first-order type. The entropy change value (DS & 1.6 ± 0.08 J mol -1 K -1 ), associated with the observed phase transition (PT), indicates a moderate degree of molecular dynamical disorder. X-ray single crystal and neutron powder diffraction measurements indicated that the crystal space group (I 2/a) is the same for the high-and lowtemperature phases. However, FT-IR and RS spectra show a narrowing (during sample cooling) of the bands connected with vibrations of the H 2 O molecules and ReO 4 -ions. This suggests that the anions and the ligands from the complex cation perform rapid (picosecond correlation time scale, which is characteristic of optical spectroscopy) stochastic reorientational motions in the low-and hightemperature phases. Moreover, apart from the narrowing, the splitting of some bands can be seen below the phase transition.Keywords Diaquacalcium rhenate(VII) Á Thermal decomposition (TG/QMS) Á Phase transition Á DSC Á X-ray single crystal and neutron powder diffraction (XRSCD, NPD) Á Fourier transform middle-and far-infrared spectroscopy (FT-MIR and FT-FIR)

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Section: Resultssupporting

confidence: 91%

Section: Methodssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crystal structure, phase transitions and vibrations of H2O molecules in [Ca(H2O)2](ReO4)2

Hetmańczyk

Nitek

2017

J Therm Anal Calorim

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“…In these perrhenates, the coordination number of the central cation depends mainly on the size of the 3+ ion. This dependence is also observed for many others compounds based on perrhenate as a ligand, including alkalines-earth metals, transition metals and rare-earth ions as central cation [6][7][8][9][10][11][12][13][14][15][16][17][18] . All of them with oxidation states 2+ or 3+.…”

Section: Introductionmentioning

confidence: 99%

CRYSTAL STRUCTURE OF A NEW BISMUTH PERRHENATE Bi(Re0(4))3H(2)0

Mujica

Llanos

Sánchez

et al. 2008

J. Chil. Chem. Soc.

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Monoaquatris(tetraoxorhenate (VII)) bismuth(III), Bi(ReO 4 ) 3 (H 2 O) was prepared by reaction of (BiO) 2 CO 3 /Bi 2 (CO 3 ) 3 with concentrated HReO 4 at room temperature. The pale yellow compound crystallize triclinic in the space group P1;, (No. 2); with two formula units per unit cell (a = 746.0(1) pm, b = 777.1(2) pm, c = 990.5(2) pm, α = 100.99(3)°, β = 99.88(3)°, γ = 100.17(3)° ). The main feature of the crystal structure is a distorted bicapped trigonal prism of Bi[(ReO 4 ) 3/2 (ReO 4 ) 2/2 (ReO 4 ) 2/2 (H 2 O)], which are connected each other through [ReO 4 ]-tetrahedra to form a three-dimensional network. In the titled compound, the cation Bi 3+ is eightfold coordinated which agree with the tendency observed in other compounds of the family.

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Pertechnetates – A Structural Study Across the Periodic Table

Strub,

Grödler,

Zaratti

et al. 2024

Chemistry A European J

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The number of crystal structures of pertechnetates derived from aqueous solutions has been expanded from seven to over 30. We report the conversion of NH4TcO4 to aqueous HTcO4 via acidic cation exchange. This is followed by the synthesis and structural elucidation of pertechnetate salts of alkaline earth (AE), transition metal (TM) and lanthanoids (Ln) elements. Various degrees of hydration and coordination are discussed. Where possible, a comparison with the perrhenate homologues is made. The described syntheses and materials may be used as novel starting materials for extended technetium research.

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The crystal structure of Ca(ReO4)2 · 2H2O

Cited by 9 publications

References 5 publications

Crystal structure, phase transitions and vibrations of H2O molecules in [Ca(H2O)2](ReO4)2

Crystal structure, phase transitions and vibrations of H2O molecules in [Ca(H2O)2](ReO4)2

CRYSTAL STRUCTURE OF A NEW BISMUTH PERRHENATE Bi(Re0(4))3H(2)0

Pertechnetates – A Structural Study Across the Periodic Table

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