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Guanidinium tetrabromidomercurate(II)

Acta Crystallographica Section E Structure Reports Online (Impact Factor: 0.35). 03/2009; 65(Pt 3):m323. DOI: 10.1107/S1600536809005972
Source: PubMed

ABSTRACT The Hg atoms in the crystal structure of the title compound, (CH(6)N(3))(2)[HgBr(4)], are tetra-hedrally coordinated by four Br atoms and the resulting [HgBr(4)](2-) tetra-hedral ions are linked to the [C(NH(2))(3)](+) ions by bromine-hydrogen bonds, forming a three-dimensional network. In the structure, the anions are located on special positions. The two different Hg⋯Br distances of 2.664 (1) and 2.559 (1) Å observed in the tetra-bromidomercurate unit are due to the connection of Br atoms to different number of H atoms.

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    ABSTRACT: The Hg atom in the crystal structure of the title compound, (CH(6)N(3))(2)[HgI(4)], is tetra-hedrally coordinated by four I atoms. The [HgI(4)](2-) ions are inter-connected to the [C(NH(2))(3)](+) ions by N-H⋯I hydrogen bonds, forming a three-dimensional network. The four different observed Hg-I distances [2.760 (2), 2.7762 (15), 2.8098 (14) and 2.833 (2) Å] are consistent with four different (127)I NQR frequencies observed, showing the existence of four unique I atoms in the tetra-iodidomercurate unit.
    Acta Crystallographica Section E Structure Reports Online 05/2009; 65(Pt 5):m503. DOI:10.1107/S160053680901280X · 0.35 Impact Factor
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    ABSTRACT: The Hg(II) atoms in the crystal structure of the title compound, (C(2)H(10)N(2))[HgBr(4)]·H(2)O, are tetra-hedrally coordinated by four Br atoms and the resulting [HgBr(4)](2-) ions are inter-connected to the [NH(3)-CH(2)-CH(2)-NH(3)](2+) ions and water mol-ecules by N-H⋯Br and O-H⋯Br bonds, forming a three-dimensional network. N-H⋯O inter-actions are also present. The observed three different Hg-Br distances of 2.5597 (6), 2.6862 (8) and 2.6923 (8) Å in the tetra-bromo-mercurate unit are due to the connection of Br atoms to different numbers of H atoms. The Hg, O and two Br atoms are located on a crystallographic mirror plane. The cation has symmetry with the center of the C-C bond lying on a crystallographic center of inversion.
    Acta Crystallographica Section E Structure Reports Online 08/2009; 65(Pt 8):m946. DOI:10.1107/S160053680902772X · 0.35 Impact Factor
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    ABSTRACT: The crystal structure of [C(NH2)3]3Hg2I7 crystallizes in the monoclinic space group C2/c with a=10.301(2), b=11.919(2), c=22.143(4)Å, β=100.50(3)°, and Z=4. The asymmetric unit of the structure consists of an Hg2I73− anion and three guanidinium cations [C(NH2)3]+. The Hg2I73− anion is composed of two distorted HgI4 tetrahedra which share an apex of I(4) atom and are related to each other by the C2 axis. The lengths of the four Hg–I bonds of the tetrahedron are different, the longest being the bridging Hg–I(4) bond. In accordance with the crystal structure, four 127I NQR resonance lines have been observed and are assigned to m=±1/2↔±3/2 transitions. With decreasing temperature one line assigned to the bridging I(4) atom faded out around 250K. The temperature dependence of 1H NMR T1 has been analyzed by postulating the C3 reorientations of two crystallographically independent cations with the BPP and the Arrhenius type relations. The hydrogen bond interactions N–H⋯I are important in the architecture of the crystal structure, which manifest themselves on the differences in the Hg–I bond lengths, in the NQR frequencies, and in the activation energies of the cation reorientations.
    Journal of Molecular Structure 08/2009; 932(1):61-66. DOI:10.1016/j.molstruc.2009.05.041 · 1.60 Impact Factor

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