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Peter R. Slater - One of the best experts on this subject based on the ideXlab platform.
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Investigation into the effect on structure of Oxoanion doping in Na2M(SO4)2·2H2O
Journal of Solid State Chemistry, 2016Co-Authors: Laura Driscoll, Emma Kendrick, Adrian J. Wright, Peter R. SlaterAbstract:Abstract In this paper an investigation into the effect of transition metal ion and selenate/fluorophosphate doping on the structures of Na2M(SO4)2·2H2O (M=transition metal) materials is reported. In agreement with previous reports, the monoclinic (Krohnkite) structure is adopted for M=Mn, Fe, Co, Cu, while for the smallest first row divalent transition metal ion, M=Ni, the triclinic (Fairfieldite structure) is adopted. On selenate doping there is a changeover in structure from monoclinic to triclinic for M=Fe, Co, Cu, with the larger Fe2+ system requiring the highest level of selenate to complete the changeover. Thus the results suggest that the relative stability of the two structure types is influenced by the relative size of the transition metal: Oxoanion group, with the triclinic structure favoured for small transition metals/large Oxoanions. The successful synthesis of fluorophosphate doped samples, Na2M(SO4)2−x(PO3F)x·2H2O was also obtained for M=Fe, Co, Cu, with the results showing a changeover in structure from monoclinic to triclinic for M=Co, Cu for very low levels (x=0.1) of fluorophosphate. In the case of M=Fe, the successful synthesis of fluorophosphates samples was achieved for x≤0.3, although no change in cell symmetry was observed. Rather in this particular case, the X-ray diffraction patterns showed evidence for selective peak broadening, attributed to local disorder as a result of the fluorophosphate group disrupting the H-bonding network. Overall the work highlights how isovalent doping can be exploited to alter the structures of Na2M(SO4)2·2H2O systems.
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Synthesis and characterization of oxyanion (phosphate, sulphate) doped Ba2Sc2−yGayO5
Journal of Solid State Chemistry, 2013Co-Authors: A D Smith, J.f. Shin, Peter R. SlaterAbstract:Abstract In this paper we examine the effect of partial substitution of Ga for Sc in the oxyanion (phosphate, sulphate) containing perovskites, Ba2Sc2−xPxO5+x and Ba2Sc2−xSxO5+3x/2 with the samples analysed through a combination of X-ray diffraction, TGA, Raman spectroscopy and conductivity measurements. The results demonstrate that in both cases, Ga can be incorporated in place of Sc up to 40%. In order to accommodate the increasing Ga content, a reduction in the oxyanion content is required. Thus for the highest Ga content sample achieved, only 10% oxyanion incorporation was achieved giving endmember compositions of Ba2ScGa0.8P0.2O5.2 and Ba2ScGa0.8S0.2O5.3 for phosphate and sulphate doping respectively. While the Ga doping was shown to significantly improve the stability of the systems towards CO2 containing atmospheres, conductivity measurements showed a reduction in the conductivity with increasing Ga content.
Steven H. Strauss - One of the best experts on this subject based on the ideXlab platform.
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Structures of 1,1′,3,3′-Tetra(2-methyl-2-nonyl)ferrocenium(1+) Oxoanion(1−) Salts. Layered Materials with Alternating Ionic and Low-Dielectric Paraffin-Like Domains Through Which Anion Diffusion is Rapid
Crystal Growth & Design, 2012Co-Authors: Brady J. Clapsaddle, Samira Caamaño, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Susie M. Miller, Oren P. Anderson, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 A for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to ...
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structures of 1 1 3 3 tetra 2 methyl 2 nonyl ferrocenium 1 Oxoanion 1 salts layered materials with alternating ionic and low dielectric paraffin like domains through which anion diffusion is rapid
Crystal Growth & Design, 2012Co-Authors: Brady J. Clapsaddle, Samira Caamaño, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Susie M. Miller, Oren P. Anderson, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 A for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to ...
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Structures of 1,1′,3,3′-Tetra(2-methyl-2-nonyl)ferrocenium(1+) Oxoanion(1−) Salts. Layered Materials with Alternating Ionic and Low-Dielectric Paraffin-Like Domains Through Which Anion Diffusion is Rapid
2012Co-Authors: Brady J. Clapsaddle, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Oren P. Anderson, Samira Caamaño, Susie M. Miller, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 Å for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to resemble the crystal structures, has been demonstrated
F W Goetz - One of the best experts on this subject based on the ideXlab platform.
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Oxoanions stimulate in vitro ovulation and signal transduction pathways in goldfish (Carassius auratus) follicles
American Journal of Physiology-Endocrinology and Metabolism, 1992Co-Authors: S Y Hsu, F W GoetzAbstract:The present study investigated the effects of a number of Oxoanion compounds on in vitro ovulation of goldfish follicles and ovarian second messenger activities. Significant levels of ovulation wer...
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Oxoanions stimulate in vitro ovulation and signal transduction pathways in goldfish (Carassius auratus) follicles.
The American journal of physiology, 1992Co-Authors: S Y Hsu, F W GoetzAbstract:The present study investigated the effects of a number of Oxoanion compounds on in vitro ovulation of goldfish follicles and ovarian second messenger activities. Significant levels of ovulation were induced by 0.1 mM sodium chromate, 0.1 mM sodium metavanadate, 10 mM sodium molybdate, 0.1 mM sodium orthovanadate, 5 mM sodium selenate, 0.5 mM sodium tungstate, and 0.1 mM vanadyl sulfate. At levels that significantly stimulated ovulation, metavanadate, molybdate, orthovanadate, tungstate, and vanadyl sulfate also stimulated follicular phosphatidylinositol cycling and inhibited ovarian alkaline phosphatase activity. Moreover, the ovulation induced by these Oxoanions was not inhibited by indomethacin (10 micrograms/ml), while ovulation induced by selenate and chromate was. In contrast, only vanadium-containing compounds significantly stimulated prostaglandin (PG) synthesis, and, in fact, selenate significantly inhibited PG production. Finally, only sodium molybdate- and vanadium-containing compounds appeared to increase follicular adenosine 3',5'-cyclic monophosphate content. While all Oxoanions stimulated in vitro ovulation, they had differential effects on certain signal transduction pathways when tested at concentrations that stimulated in vitro ovulation. From the results, two basic groups could be delineated, one containing tungstate-, molybdate-, and vanadium-containing compounds and the other selenate and chromate. Thus the mechanism by which ovulation is induced by chromate and selenate may be different from that of vanadium-containing compounds, molybdate, and tungstate.(ABSTRACT TRUNCATED AT 250 WORDS)
Biswajit Dey - One of the best experts on this subject based on the ideXlab platform.
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selective picomolar level fluorometric sensing of the cr vi Oxoanion in a water medium by a novel metal organic complex
RSC Advances, 2016Co-Authors: Ranjan Kumar Mondal, Subhendu Dhibar, Priyanka Mukherjee, Asoke P. Chattopadhyay, Rajat Saha, Biswajit DeyAbstract:A novel metal–organic complex (MOC) of Cu(II) with n-butylmalonate ligands and protonated 2-aminopyridimium rings has been synthesized and structurally characterized by single-crystal X-ray diffraction. An intriguing supramolecular interaction i.e. hydrogen-bonding pattern (like N–H⋯O and O–H⋯O) assisted lone-pair⋯π/π⋯π assembly is observed in the crystalline form of the MOC. The role of different non-covalent contacts in the formation of the MOC in the solid-state has also been scrutinized through Hirshfeld Surface Analysis. The luminescence properties of the MOC in the water solution were also experimentally investigated. The aqueous solution of the MOC acts as a selective picomolar level fluorescent sensor for Cr(VI)-Oxoanion in water medium. Even the presence of several other cations like Li+, Na+, K+, Ca2+, Mg2+, Fe2+, Co2+, Ni2+, Cd2+, Hg2+, Zn2+, another chromium source like Cr3+ and versatile anions including F−, Cl−, Br−, SO42−, N3−, NO3−, BF4−, ClO4−, AsO33−, PO43− do not interfere with the picomolar level Cr(VI)-Oxoanion sensing ability of the MOC in water medium. The probable sensing mechanism of the Cr(VI)-Oxoanion by the MOC has been investigated experimentally and theoretically.
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Selective picomolar level fluorometric sensing of the Cr(vi)-Oxoanion in a water medium by a novel metal–organic complex
RSC Advances, 2016Co-Authors: Ranjan Kumar Mondal, Subhendu Dhibar, Priyanka Mukherjee, Asoke P. Chattopadhyay, Rajat Saha, Biswajit DeyAbstract:A novel metal–organic complex (MOC) of Cu(II) with n-butylmalonate ligands and protonated 2-aminopyridimium rings has been synthesized and structurally characterized by single-crystal X-ray diffraction. An intriguing supramolecular interaction i.e. hydrogen-bonding pattern (like N–H⋯O and O–H⋯O) assisted lone-pair⋯π/π⋯π assembly is observed in the crystalline form of the MOC. The role of different non-covalent contacts in the formation of the MOC in the solid-state has also been scrutinized through Hirshfeld Surface Analysis. The luminescence properties of the MOC in the water solution were also experimentally investigated. The aqueous solution of the MOC acts as a selective picomolar level fluorescent sensor for Cr(VI)-Oxoanion in water medium. Even the presence of several other cations like Li+, Na+, K+, Ca2+, Mg2+, Fe2+, Co2+, Ni2+, Cd2+, Hg2+, Zn2+, another chromium source like Cr3+ and versatile anions including F−, Cl−, Br−, SO42−, N3−, NO3−, BF4−, ClO4−, AsO33−, PO43− do not interfere with the picomolar level Cr(VI)-Oxoanion sensing ability of the MOC in water medium. The probable sensing mechanism of the Cr(VI)-Oxoanion by the MOC has been investigated experimentally and theoretically.
Brady J. Clapsaddle - One of the best experts on this subject based on the ideXlab platform.
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Structures of 1,1′,3,3′-Tetra(2-methyl-2-nonyl)ferrocenium(1+) Oxoanion(1−) Salts. Layered Materials with Alternating Ionic and Low-Dielectric Paraffin-Like Domains Through Which Anion Diffusion is Rapid
Crystal Growth & Design, 2012Co-Authors: Brady J. Clapsaddle, Samira Caamaño, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Susie M. Miller, Oren P. Anderson, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 A for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to ...
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structures of 1 1 3 3 tetra 2 methyl 2 nonyl ferrocenium 1 Oxoanion 1 salts layered materials with alternating ionic and low dielectric paraffin like domains through which anion diffusion is rapid
Crystal Growth & Design, 2012Co-Authors: Brady J. Clapsaddle, Samira Caamaño, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Susie M. Miller, Oren P. Anderson, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 A for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to ...
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Structures of 1,1′,3,3′-Tetra(2-methyl-2-nonyl)ferrocenium(1+) Oxoanion(1−) Salts. Layered Materials with Alternating Ionic and Low-Dielectric Paraffin-Like Domains Through Which Anion Diffusion is Rapid
2012Co-Authors: Brady J. Clapsaddle, Gretchen N. Hebert, Michael B. Bayless, Yoshihiro Kobayashi, Oren P. Anderson, Samira Caamaño, Susie M. Miller, Steven H. StraussAbstract:The unprecedented interdigitated and layered structures of 1,1′,3,3′-tetra(2-methyl-2-nonyl)ferrocene (DEC) and the Oxoanion ferrocenium salts DEC+NO3–, DEC+ClO4–, and DEC+ReO4– were determined by single-crystal X-ray diffraction. The four structures are similar except that the three DEC+ salts have layers of XOn– Oxoanions stuffed between the layers of interdigitated ferrocenium ions. The perpendicular distances between layers of Fe atoms are 8.530, 9.108, 9.009, and 9.158 Å for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The structures also contain layers of rigorously coplanar Fe and X atoms that are tilted 65.4, 75.9, 61.9, and 61.1° from the aforementioned layers of Fe atoms for DEC, DEC+NO3–, DEC+ClO4–, and DEC+ReO4–, respectively. The local environments of the XOn– Oxoanions consist of networks of C–H···O hydrogen bonds, and the structures exhibit channels through which these anions could diffuse. Facile diffusion of these anions in thin films of DEC+XOn–, with structures that appear to resemble the crystal structures, has been demonstrated
