Various magnetic phases, as obtained by combining finite SWCNTs in ferromagnetic (FM) or antiferromagnetic (AFM) coordination, are distinguished. These phases are shown to depend on the contact region geometry which defines the order of their stabilities. A wide variety of magnetic networks, with potential applications in spintronics, can be built from these nanosystems. Thiophene based extended Aza-monocyclic receptors: higher selectivity toward hydrated fluoride over other anions Syed Ataul Haque1, Musabbir A. Saeed1, Avijit Pramanik1, Douglas R. Powell2 and Md. Alamgir Hossain1 1Department of Chemistry and Biochemistry, Jackson University, Jackson, MS 39217 2Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019 Recognition and binding of anions has become an emerging field in chemical science because of their substantial health and environmental issues. While designing anion sensor and receptors, consideration should be given on the properties of anions i.e. size, symmetry, hydration properties, charge density etc. For example, fluoride is found hydrated in an aquatic system because of its high electronegativity and small size. During this study, we synthesized thiophene based aza-monocyclic receptor with extended space and investigated for its anion binding ability in solution state by 1H NMR, 19F NMR and in solid state by X-ray crystallography. Surprisingly, in both cases it was found that our receptors bind selectively with fluoride in 1:2 fashion. Furthermore, x-ray crystallographic results reveal four fluoride and four water assembles a fluoride and water tetrameric cluster stabilized inside the cavity formed by two parallel receptors by hydrogen bonding. Formation of dimer and the role of water in it were farther confirmed by concentration dependent NMR and water dilution experiment. Boron-based icosahedra, the computational/electron diffraction structural consequences of functionalising the cluster atoms, and their removal. Possible application of shared icosahedra in materials science and medicine. Drahomír Hnyk1*, Jan Macháček1, Derek A. Wann2, Heather E. Robertson2, Paul D. Lane2, Tomáš Baše1 and Josef Holub1
Various magnetic phases, as obtained by combining finite SWCNTs in ferromagnetic (FM) or antiferromagnetic (AFM) coordination, are distinguished. These phases are shown to depend on the contact region geometry which defines the order of their stabilities. A wide variety of magnetic networks, with potential applications in spintronics, can be built from these nanosystems. Thiophene based extended Aza-monocyclic receptors: higher selectivity toward hydrated fluoride over other anions Syed Ataul Haque1, Musabbir A. Saeed1, Avijit Pramanik1, Douglas R. Powell2 and Md. Alamgir Hossain1 1Department of Chemistry and Biochemistry, Jackson University, Jackson, MS 39217 2Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019 Recognition and binding of anions has become an emerging field in chemical science because of their substantial health and environmental issues. While designing anion sensor and receptors, consideration should be given on the properties of anions i.e. size, symmetry, hydration properties, charge density etc. For example, fluoride is found hydrated in an aquatic system because of its high electronegativity and small size. During this study, we synthesized thiophene based aza-monocyclic receptor with extended space and investigated for its anion binding ability in solution state by 1H NMR, 19F NMR and in solid state by X-ray crystallography. Surprisingly, in both cases it was found that our receptors bind selectively with fluoride in 1:2 fashion. Furthermore, x-ray crystallographic results reveal four fluoride and four water assembles a fluoride and water tetrameric cluster stabilized inside the cavity formed by two parallel receptors by hydrogen bonding. Formation of dimer and the role of water in it were farther confirmed by concentration dependent NMR and water dilution experiment. Boron-based icosahedra, the computational/electron diffraction structural consequences of functionalising the cluster atoms, and their removal. Possible application of shared icosahedra in materials science and medicine. Drahomír Hnyk1*, Jan Macháček1, Derek A. Wann2, Heather E. Robertson2, Paul D. Lane2, Tomáš Baše1 and Josef Holub1
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