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Journal of Chemical Physics | 1963

CRYSTAL STRUCTURE OF CERIUM MAGNESIUM NITRATE HYDRATE

Allan Zalkin; J. D. Forrester; David H. Templeton

According to single‐crystal x‐ray diffraction data, crystals of Ce2Mg3(NO3)12·24H2O are rhombohedral, space group R3. The hexagonal cell with a = 11.004±0.006, c = 34.592±0.012 A contains three formula units. Atomic parameters were refined by least squares, and interatomic distances were corrected for thermal motion. The average N–O bond distance in nitrate is 1.26 A. The Ce atoms, on the threefold axis at z = ±0.2497, are each surrounded by 12 oxygen atoms at an average distance of 2.64 A. These oxygen atoms, belonging to six nitrate ions, are at the corners of a somewhat irregular icosahedron. The Mg atoms are of two kinds, located, respectively, at the origin and on the threefold axis at z = ±0.4279. Each Mg atom is surrounded by six water molecules with the oxygen atoms at the corners of an octahedron with an average Mg–O distance of 2.07 A. One‐fourth of the water molecules are not coordinated to cations. Evidence for the hydrogen atom positions from the diffraction data indicates that six of the ei...


Science | 1964

Crystal and Molecular Structure of Ferrichrome A.

Allan Zalkin; J. D. Forrester; David H. Templeton

The crystal structure of ferrichrome A (C41H58N9O20Fe�4H2O) has been determined by x-ray diffraction. The amino acid sequence in the hexapeptide ring is confirmed to be -Orn-Orn-Orn-Ser-Ser-Gly-, and the conformation of this ring is trans at each peptide linkage. The absolute configuration of the three hydroxamate rings at the iron atom is that of a left-handed propeller. Disorder is found concerning the positions of some of the side chains and one of the four water molecules.


Journal of the American Chemical Society | 1964

Potassium Perxenate Nonahydrate

Allan Zalkin; J. D. Forrester; David H. Templeton; Stanley M. Williamson; Charles W. Koch

Author(s): Zalkin, Allan; Forrester, J.D.; Templeton, David. H.; Williamson, Stanley M.; Koch, Charles W.


Science | 1963

Sodium Perxenate Hexahydrate.

Allan Zalkin; J. D. Forrester; David H. Templeton; Stanley M. Williamson; Charles W. Koch

Sodidm perxenate hexahydrate ( NatXeO6.6H: O) has been identified from study of its crystal structure by x-ray diffraclion. The perxenate ion( XeO64) has the shape of a regular octahedron with the Xe-O bond distance 1.84 A.


Archive | 1963

DETERMINATION OF THE CRYSTAL STRUCTURE OF XENON TRIOXIDE

David H. Templeton; Allan Zalkin; J. D. Forrester; Stanley M. Williamson

ed in Structure Reports 18., 393 (1954). . ,..., .


Journal of the American Chemical Society | 1966

FERRICHROME-A TETRAHYDRATE DETERMINATION OF CRYSTAL AND MOLECULAR STRUCTURE

Allan Zalkin; J. D. Forrester; David H. Templeton


Acta Crystallographica | 1964

The crystal structure of sodium fluorosilicate

Allan Zalkin; J. D. Forrester; David H. Templeton


Journal of the American Chemical Society | 1963

Crystal and Molecular Structure of Xenon Trioxide

David H. Templeton; Allan Zalkin; J. D. Forrester; Stanley M. Williamson


Acta Crystallographica | 1963

CRYSTAL STRUCTURE OF KH2F3 AND GEOMETRY OF THE H2F3 ""ION

J. D. Forrester; Michael E. Senko; Allan Zalkin; David H. Templeton


Journal of the American Chemical Society | 1963

CRYSTAL AND MOLECUIAR STRUCTURE OF XENON TETRAFLUORIDE

David H. Templeton; Allan Zalkin; J. D. Forrester; Stanley M. Williamson

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Allan Zalkin

University of California

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