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Richard E Sykora - One of the best experts on this subject based on the ideXlab platform.

  • syntheses structures and vibrational spectroscopy of the two dimensional iodates ln io3 3 and ln io3 3 h2o lnyb lu
    Journal of Solid State Chemistry, 2006
    Co-Authors: Zerihun Assefa, Richard E Sykora, Thomas E Albrechtschmitt, Jie Ling, R G Haire
    Abstract:

    Abstract The reaction of Lu 3+ or Yb 3+ and H 5 IO 6 in aqueous media at 180 °C leads to the formation of Yb(IO 3 ) 3 (H 2 O) or Lu(IO 3 ) 3 (H 2 O), respectively, while the reaction of Yb metal with H 5 IO 6 under similar reaction conditions gives rise to the anhydrous iodate, Yb(IO 3 ) 3 . Under supercritical conditions Lu 3+ reacts with HIO 3 and KIO 4 to yield the isostructural Lu(IO 3 ) 3 . The structures have been determined by single-crystal X-ray diffraction. Crystallographic data are (Mo K α, λ =0.71073 A): Yb(IO 3 ) 3 , Monoclinic, Space Group P 2 1 / n , a =8.6664(9) A, b =5.9904(6) A, c =14.8826(15) A, β =96.931(2)°, V =766.99(13), Z =4, R ( F )=4.23% for 114 parameters with 1880 reflections with I >2 σ ( I ); Lu(IO 3 ) 3 , Monoclinic, Space Group P 2 1 / n , a =8.6410(9), b =5.9961(6), c =14.8782(16) A, β =97.028(2)°, V =765.08(14), Z =4, R ( F )=2.65% for 119 parameters with 1756 reflections with I >2 σ ( I ); Yb(IO 3 ) 3 (H 2 O), Monoclinic, Space Group C 2/ c , a =27.2476(15), b =5.6296(3), c =12.0157(7) A, β =98.636(1)°, V =1822.2(2), Z =8, R ( F )=1.51% for 128 parameters with 2250 reflections with I >2 σ ( I ); Lu(IO 3 ) 3 (H 2 O), Monoclinic, Space Group C 2/ c , a =27.258(4), b =5.6251(7), c =12.0006(16) A, β =98.704(2)°, V =1818.8(4), Z =8, R ( F )=1.98% for 128 parameters with 2242 reflections with I >2 σ ( I ). The f elements in all of the compounds are found in seven-coordinate environments and bridged with monodentate, bidentate, or tridentate iodate anions. Both Lu(IO 3 ) 3 (H 2 O) and Yb(IO 3 ) 3 (H 2 O) display distinctively different vibrational profiles from their respective anhydrous analogs. Hence, the Raman profile can be used as a complementary diagnostic tool to discern the different structural motifs of the compounds.

  • hydrothermal preparation structures and nlo properties of the rare earth molybdenyl iodates re moo2 io3 4 oh re nd sm eu
    Inorganic Chemistry, 2003
    Co-Authors: Thomas C Shehee, Richard E Sykora, Shiv P Halasyamani, Thomas E Albrechtschmitt
    Abstract:

    The reactions of RE(IO3)3 [RE = Nd, Sm, Eu] with I2O5 and MoO3 in a 1:2:2 molar ratio at 200 degrees C in aqueous media provide access to RE(MoO2)(IO3)4(OH) [RE = Nd (1), Sm (2), Eu (3)] as pure phases as determined from powder X-ray diffraction data. Single crystal X-ray diffraction experiments demonstrate that these compounds are isostructural and crystallize in the chiral and polar Space Group P2(1). The structures are composed of three-dimensional networks formed from eight-coordinate, square antiprismatic RE3+ cations and MoO2(OH)+ moieties that are bound by bridging iodate anions. The Mo(VI) centers are present in distorted octahedral environments composed of two cis-oxo atoms, a hydroxo Group, and three bridging iodate anions arranged in a fac geometry. There are four crystallographically unique iodate anions in the structures of 1-3, one of these is actually present in the form of a IO3+1 polyhedron where a short interaction of 2.285(4) A is formed between the iodate anion and the hydroxo Group bound to the Mo(VI) center. This interaction results in significant distortions of the iodate anion similar to those found in tellurites with TeO3+1 units. Two of the four iodate anions are aligned along the polar b-axis, imparting the required polarity to these compounds. Second-harmonic generation (SHG) measurements on sieved powders of 1 show a response of 350 x alpha-quartz. Crystallographic data: 1, Monoclinic, Space Group P2(1), a = 6.9383(5) A, b = 14.0279(9) A, c = 7.0397(5) A, beta = 114.890(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1), a = 6.9243(6) A, b = 13.963(1) A, c = 7.0229(6) A, beta = 114.681(1) degrees, Z = 2; 3, Monoclinic, Space Group P2(1), a = 6.9169(6) A, b = 13.943(1) A, c = 7.0170(6) A, beta = 114.542(1) degrees, Z = 2.

  • mixed metal uranium vi iodates hydrothermal syntheses structures and reactivity of rb uo 2 cro 4 io 3 h 2 o a 2 uo 2 cro 4 io 3 2 a k rb cs and k 2 uo 2 moo 4 io 3 2
    Inorganic Chemistry, 2002
    Co-Authors: Richard E Sykora, Daniel M Wells, Steven M Mcdaniel, Thomas E Albrechtschmitt
    Abstract:

    The reactions of the molecular transition metal iodates A[CrO(3)(IO(3))] (A = K, Rb, Cs) with UO(3) under mild hydrothermal conditions provide access to four new, one-dimensional, uranyl chromatoiodates, Rb[UO(2)(CrO(4))(IO(3))(H(2)O)] (1) and A(2)[UO(2)(CrO(4))(IO(3))(2)] (A = K (2), Rb (3), Cs (4)). Under basic conditions, MoO(3), UO(3), and KIO(4) can be reacted to form K(2)[UO(2)(MoO(4))(IO(3))(2)] (5), which is isostructural with 2 and 3. The structure of 1 consists of one-dimensional[UO(2)(CrO(4))(IO(3))(H(2)O)](-) ribbons that contain uranyl moieties bound by bridging chromate and iodate anions as well as a terminal water molecule to create [UO(7)] pentagonal bipyramidal environments around the U(VI) centers. These ribbons are separated from one another by Rb(+) cations. When the iodate content is increased in the hydrothermal reactions, the terminal water molecule is replaced by a monodentate iodate anion to yield 2-4. These ribbons can be further modified by replacing tetrahedral chromate anions with MoO(4)(2)(-) anions to yield isostructural, one-dimensional [UO(2)(MoO(4))(IO(3))(2)](2)(-) ribbons. Crystallographic data: 1, triclinic, Space Group P(-)1, a = 7.3133(5) A, b = 8.0561(6) A, c = 8.4870(6) A, alpha = 88.740(1) degrees, beta = 87.075(1) degrees, gamma = 71.672(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1)/c, a = 11.1337(5) A, b = 7.2884(4) A, c = 15.5661(7) A, beta = 107.977(1) degrees, Z = 4; 3, Monoclinic, Space Group P2(1)/c, a = 11.3463(6) A, b = 7.3263(4) A, c = 15.9332(8) A, beta = 108.173(1) degrees, Z = 4; 4, Monoclinic, Space Group P2(1)/n, a = 7.3929(5) A, b = 8.1346(6) A, c = 22.126(2) A, beta = 90.647(1) degrees, Z = 4; 5, Monoclinic, Space Group P2(1)/c, a = 11.3717(6) A, b = 7.2903(4) A, c = 15.7122(8) A, beta = 108.167(1) degrees, Z = 4.

Thomas E Albrechtschmitt - One of the best experts on this subject based on the ideXlab platform.

  • syntheses structures and vibrational spectroscopy of the two dimensional iodates ln io3 3 and ln io3 3 h2o lnyb lu
    Journal of Solid State Chemistry, 2006
    Co-Authors: Zerihun Assefa, Richard E Sykora, Thomas E Albrechtschmitt, Jie Ling, R G Haire
    Abstract:

    Abstract The reaction of Lu 3+ or Yb 3+ and H 5 IO 6 in aqueous media at 180 °C leads to the formation of Yb(IO 3 ) 3 (H 2 O) or Lu(IO 3 ) 3 (H 2 O), respectively, while the reaction of Yb metal with H 5 IO 6 under similar reaction conditions gives rise to the anhydrous iodate, Yb(IO 3 ) 3 . Under supercritical conditions Lu 3+ reacts with HIO 3 and KIO 4 to yield the isostructural Lu(IO 3 ) 3 . The structures have been determined by single-crystal X-ray diffraction. Crystallographic data are (Mo K α, λ =0.71073 A): Yb(IO 3 ) 3 , Monoclinic, Space Group P 2 1 / n , a =8.6664(9) A, b =5.9904(6) A, c =14.8826(15) A, β =96.931(2)°, V =766.99(13), Z =4, R ( F )=4.23% for 114 parameters with 1880 reflections with I >2 σ ( I ); Lu(IO 3 ) 3 , Monoclinic, Space Group P 2 1 / n , a =8.6410(9), b =5.9961(6), c =14.8782(16) A, β =97.028(2)°, V =765.08(14), Z =4, R ( F )=2.65% for 119 parameters with 1756 reflections with I >2 σ ( I ); Yb(IO 3 ) 3 (H 2 O), Monoclinic, Space Group C 2/ c , a =27.2476(15), b =5.6296(3), c =12.0157(7) A, β =98.636(1)°, V =1822.2(2), Z =8, R ( F )=1.51% for 128 parameters with 2250 reflections with I >2 σ ( I ); Lu(IO 3 ) 3 (H 2 O), Monoclinic, Space Group C 2/ c , a =27.258(4), b =5.6251(7), c =12.0006(16) A, β =98.704(2)°, V =1818.8(4), Z =8, R ( F )=1.98% for 128 parameters with 2242 reflections with I >2 σ ( I ). The f elements in all of the compounds are found in seven-coordinate environments and bridged with monodentate, bidentate, or tridentate iodate anions. Both Lu(IO 3 ) 3 (H 2 O) and Yb(IO 3 ) 3 (H 2 O) display distinctively different vibrational profiles from their respective anhydrous analogs. Hence, the Raman profile can be used as a complementary diagnostic tool to discern the different structural motifs of the compounds.

  • hydrothermal preparation structures and nlo properties of the rare earth molybdenyl iodates re moo2 io3 4 oh re nd sm eu
    Inorganic Chemistry, 2003
    Co-Authors: Thomas C Shehee, Richard E Sykora, Shiv P Halasyamani, Thomas E Albrechtschmitt
    Abstract:

    The reactions of RE(IO3)3 [RE = Nd, Sm, Eu] with I2O5 and MoO3 in a 1:2:2 molar ratio at 200 degrees C in aqueous media provide access to RE(MoO2)(IO3)4(OH) [RE = Nd (1), Sm (2), Eu (3)] as pure phases as determined from powder X-ray diffraction data. Single crystal X-ray diffraction experiments demonstrate that these compounds are isostructural and crystallize in the chiral and polar Space Group P2(1). The structures are composed of three-dimensional networks formed from eight-coordinate, square antiprismatic RE3+ cations and MoO2(OH)+ moieties that are bound by bridging iodate anions. The Mo(VI) centers are present in distorted octahedral environments composed of two cis-oxo atoms, a hydroxo Group, and three bridging iodate anions arranged in a fac geometry. There are four crystallographically unique iodate anions in the structures of 1-3, one of these is actually present in the form of a IO3+1 polyhedron where a short interaction of 2.285(4) A is formed between the iodate anion and the hydroxo Group bound to the Mo(VI) center. This interaction results in significant distortions of the iodate anion similar to those found in tellurites with TeO3+1 units. Two of the four iodate anions are aligned along the polar b-axis, imparting the required polarity to these compounds. Second-harmonic generation (SHG) measurements on sieved powders of 1 show a response of 350 x alpha-quartz. Crystallographic data: 1, Monoclinic, Space Group P2(1), a = 6.9383(5) A, b = 14.0279(9) A, c = 7.0397(5) A, beta = 114.890(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1), a = 6.9243(6) A, b = 13.963(1) A, c = 7.0229(6) A, beta = 114.681(1) degrees, Z = 2; 3, Monoclinic, Space Group P2(1), a = 6.9169(6) A, b = 13.943(1) A, c = 7.0170(6) A, beta = 114.542(1) degrees, Z = 2.

  • mixed metal uranium vi iodates hydrothermal syntheses structures and reactivity of rb uo 2 cro 4 io 3 h 2 o a 2 uo 2 cro 4 io 3 2 a k rb cs and k 2 uo 2 moo 4 io 3 2
    Inorganic Chemistry, 2002
    Co-Authors: Richard E Sykora, Daniel M Wells, Steven M Mcdaniel, Thomas E Albrechtschmitt
    Abstract:

    The reactions of the molecular transition metal iodates A[CrO(3)(IO(3))] (A = K, Rb, Cs) with UO(3) under mild hydrothermal conditions provide access to four new, one-dimensional, uranyl chromatoiodates, Rb[UO(2)(CrO(4))(IO(3))(H(2)O)] (1) and A(2)[UO(2)(CrO(4))(IO(3))(2)] (A = K (2), Rb (3), Cs (4)). Under basic conditions, MoO(3), UO(3), and KIO(4) can be reacted to form K(2)[UO(2)(MoO(4))(IO(3))(2)] (5), which is isostructural with 2 and 3. The structure of 1 consists of one-dimensional[UO(2)(CrO(4))(IO(3))(H(2)O)](-) ribbons that contain uranyl moieties bound by bridging chromate and iodate anions as well as a terminal water molecule to create [UO(7)] pentagonal bipyramidal environments around the U(VI) centers. These ribbons are separated from one another by Rb(+) cations. When the iodate content is increased in the hydrothermal reactions, the terminal water molecule is replaced by a monodentate iodate anion to yield 2-4. These ribbons can be further modified by replacing tetrahedral chromate anions with MoO(4)(2)(-) anions to yield isostructural, one-dimensional [UO(2)(MoO(4))(IO(3))(2)](2)(-) ribbons. Crystallographic data: 1, triclinic, Space Group P(-)1, a = 7.3133(5) A, b = 8.0561(6) A, c = 8.4870(6) A, alpha = 88.740(1) degrees, beta = 87.075(1) degrees, gamma = 71.672(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1)/c, a = 11.1337(5) A, b = 7.2884(4) A, c = 15.5661(7) A, beta = 107.977(1) degrees, Z = 4; 3, Monoclinic, Space Group P2(1)/c, a = 11.3463(6) A, b = 7.3263(4) A, c = 15.9332(8) A, beta = 108.173(1) degrees, Z = 4; 4, Monoclinic, Space Group P2(1)/n, a = 7.3929(5) A, b = 8.1346(6) A, c = 22.126(2) A, beta = 90.647(1) degrees, Z = 4; 5, Monoclinic, Space Group P2(1)/c, a = 11.3717(6) A, b = 7.2903(4) A, c = 15.7122(8) A, beta = 108.167(1) degrees, Z = 4.

Steven M Mcdaniel - One of the best experts on this subject based on the ideXlab platform.

  • mixed metal uranium vi iodates hydrothermal syntheses structures and reactivity of rb uo 2 cro 4 io 3 h 2 o a 2 uo 2 cro 4 io 3 2 a k rb cs and k 2 uo 2 moo 4 io 3 2
    Inorganic Chemistry, 2002
    Co-Authors: Richard E Sykora, Daniel M Wells, Steven M Mcdaniel, Thomas E Albrechtschmitt
    Abstract:

    The reactions of the molecular transition metal iodates A[CrO(3)(IO(3))] (A = K, Rb, Cs) with UO(3) under mild hydrothermal conditions provide access to four new, one-dimensional, uranyl chromatoiodates, Rb[UO(2)(CrO(4))(IO(3))(H(2)O)] (1) and A(2)[UO(2)(CrO(4))(IO(3))(2)] (A = K (2), Rb (3), Cs (4)). Under basic conditions, MoO(3), UO(3), and KIO(4) can be reacted to form K(2)[UO(2)(MoO(4))(IO(3))(2)] (5), which is isostructural with 2 and 3. The structure of 1 consists of one-dimensional[UO(2)(CrO(4))(IO(3))(H(2)O)](-) ribbons that contain uranyl moieties bound by bridging chromate and iodate anions as well as a terminal water molecule to create [UO(7)] pentagonal bipyramidal environments around the U(VI) centers. These ribbons are separated from one another by Rb(+) cations. When the iodate content is increased in the hydrothermal reactions, the terminal water molecule is replaced by a monodentate iodate anion to yield 2-4. These ribbons can be further modified by replacing tetrahedral chromate anions with MoO(4)(2)(-) anions to yield isostructural, one-dimensional [UO(2)(MoO(4))(IO(3))(2)](2)(-) ribbons. Crystallographic data: 1, triclinic, Space Group P(-)1, a = 7.3133(5) A, b = 8.0561(6) A, c = 8.4870(6) A, alpha = 88.740(1) degrees, beta = 87.075(1) degrees, gamma = 71.672(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1)/c, a = 11.1337(5) A, b = 7.2884(4) A, c = 15.5661(7) A, beta = 107.977(1) degrees, Z = 4; 3, Monoclinic, Space Group P2(1)/c, a = 11.3463(6) A, b = 7.3263(4) A, c = 15.9332(8) A, beta = 108.173(1) degrees, Z = 4; 4, Monoclinic, Space Group P2(1)/n, a = 7.3929(5) A, b = 8.1346(6) A, c = 22.126(2) A, beta = 90.647(1) degrees, Z = 4; 5, Monoclinic, Space Group P2(1)/c, a = 11.3717(6) A, b = 7.2903(4) A, c = 15.7122(8) A, beta = 108.167(1) degrees, Z = 4.

Daniel M Wells - One of the best experts on this subject based on the ideXlab platform.

  • mixed metal uranium vi iodates hydrothermal syntheses structures and reactivity of rb uo 2 cro 4 io 3 h 2 o a 2 uo 2 cro 4 io 3 2 a k rb cs and k 2 uo 2 moo 4 io 3 2
    Inorganic Chemistry, 2002
    Co-Authors: Richard E Sykora, Daniel M Wells, Steven M Mcdaniel, Thomas E Albrechtschmitt
    Abstract:

    The reactions of the molecular transition metal iodates A[CrO(3)(IO(3))] (A = K, Rb, Cs) with UO(3) under mild hydrothermal conditions provide access to four new, one-dimensional, uranyl chromatoiodates, Rb[UO(2)(CrO(4))(IO(3))(H(2)O)] (1) and A(2)[UO(2)(CrO(4))(IO(3))(2)] (A = K (2), Rb (3), Cs (4)). Under basic conditions, MoO(3), UO(3), and KIO(4) can be reacted to form K(2)[UO(2)(MoO(4))(IO(3))(2)] (5), which is isostructural with 2 and 3. The structure of 1 consists of one-dimensional[UO(2)(CrO(4))(IO(3))(H(2)O)](-) ribbons that contain uranyl moieties bound by bridging chromate and iodate anions as well as a terminal water molecule to create [UO(7)] pentagonal bipyramidal environments around the U(VI) centers. These ribbons are separated from one another by Rb(+) cations. When the iodate content is increased in the hydrothermal reactions, the terminal water molecule is replaced by a monodentate iodate anion to yield 2-4. These ribbons can be further modified by replacing tetrahedral chromate anions with MoO(4)(2)(-) anions to yield isostructural, one-dimensional [UO(2)(MoO(4))(IO(3))(2)](2)(-) ribbons. Crystallographic data: 1, triclinic, Space Group P(-)1, a = 7.3133(5) A, b = 8.0561(6) A, c = 8.4870(6) A, alpha = 88.740(1) degrees, beta = 87.075(1) degrees, gamma = 71.672(1) degrees, Z = 2; 2, Monoclinic, Space Group P2(1)/c, a = 11.1337(5) A, b = 7.2884(4) A, c = 15.5661(7) A, beta = 107.977(1) degrees, Z = 4; 3, Monoclinic, Space Group P2(1)/c, a = 11.3463(6) A, b = 7.3263(4) A, c = 15.9332(8) A, beta = 108.173(1) degrees, Z = 4; 4, Monoclinic, Space Group P2(1)/n, a = 7.3929(5) A, b = 8.1346(6) A, c = 22.126(2) A, beta = 90.647(1) degrees, Z = 4; 5, Monoclinic, Space Group P2(1)/c, a = 11.3717(6) A, b = 7.2903(4) A, c = 15.7122(8) A, beta = 108.167(1) degrees, Z = 4.

Jon Zubieta - One of the best experts on this subject based on the ideXlab platform.