Crystallization and preliminary X-ray crystallographic analysis ofSclerotium rolfsiilectin
D.D. LeonidasBale M. SwamyAnuradha Gopal BhatShashikala R. InamdarMagda KosmopoulouEvangelia D. ChrysinaNikos G. Oikonomakos
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Abstract:
Sclerotium rolfsii lectin (SRL), from the soil-borne phytopathogenic fungus S. rolfsii, has been crystallized. SRL crystals were grown by the hanging-drop vapour-diffusion method using an MPD-ammonium acetate mixture in Tris-HCl buffer pH 8.5. A complete data set from a single crystal at 100 K was collected to 1.1 A resolution using synchrotron radiation. Preliminary crystallographic analysis showed that the crystals belong to the tetragonal space group P4(2)2(1)2, with unit-cell parameters a = b = 99.81, c = 63.99 A and two molecules per asymmetric unit.Keywords:
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The crystal structure of the new ternary stannide U2Pt2Sn has been investigated by both X-ray powder diffraction and electron diffraction. It crystallizes in a tetragonal unit cell with a= 768.1(1) pm and c= 739.1(1) pm. This crystal structure is a new superstructure of the tetragonal U3Si2-type which appears on account of the existence of short Pt–Pt distances. The crystal structure of U2Pt2Sn is described taking into consideration those of UPt and UPt2Sn.
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Single crystal of a new compound Na2.1Ba0.9Cu0.1Nb4.9O14.3 was synthesised for the first time. The crystal structure has been determined by single crystal X-ray diffraction and the final R value is 0. 0559. The compound crystallizes in a tetragonal unit cell [a = 12. 442(3) A and c = 3. 954 A ]with space growp P4/mbm and Z=2. The compound is in tetragonal tungsten-bronze type structure but some oxygen vacancies exist in the structure. The structure of the compound consists of NbO6 octahedra and octahedra (Nb, Cu)O6 to form triangle, quadrilateral and pentagonal tunnels. The quadrilateral tunnels are occupied by Na atoms. More than 1/2 pentagonal tunnels are occupied by Na atoms and less than 1/2 that are occupied by Ba atoms. Cu2+ replaces Nb5+ to form different-valence isomorpism.
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Single crystal of a new compound Na2.1Ba0.9Cu0.1Nb4.9O14.3 was synthesised for the first time. The crystal structure has been determined by single crystal X-ray diffraction and the final R value is 0. 0559. The compound crystallizes in a tetragonal unit cell [a = 12. 442(3) A and c = 3. 954 A ]with space growp P4/mbm and Z=2. The compound is in tetragonal tungsten-bronze type structure but some oxygen vacancies exist in the structure. The structure of the compound consists of NbO6 octahedra and octahedra (Nb, Cu)O6 to form triangle, quadrilateral and pentagonal tunnels. The quadrilateral tunnels are occupied by Na atoms. More than 1/2 pentagonal tunnels are occupied by Na atoms and less than 1/2 that are occupied by Ba atoms. Cu2+ replaces Nb5+ to form different-valence isomorpism.
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