CRYSTAL STRUCTURES AND CHARACTERIZATION OF TWO RARE-EARTH-GLUTARATE COORDINATION NETWORKS: ONE-DIMENSIONAL [Nd(C5H6O4)(H2O)4]*Cl AND THREE-DIMENSIONAL [Pr(C5H6O4)(C5H7O4)(H2O)]*H2O

synthesis crystal structure coordination polymer neodymium praseodymium.

СТРОЕНИЕ И ТЕРМИЧЕСКИЕ СВОЙСТВА КОМПЛЕКСА МОЛИБДЕНА Mo(acac)3, СТРОЕНИЕ СОЕДИНЕНИЙ [Pd2(H2L1)Cl4] И [Pd2(H2L1)Cl4] - 0,5CH2Cl2 С ХИРАЛЬНЫМ БИС-a-СУЛЬФАНИЛОКСИМОМ - ПРОИЗВОДНЫМ ПРИРОДНОГО МОНОТЕРПЕНОИДА (+)-3-КАРЕНА (H2L1), ...

Compound 1 is a onedimensional coordination polymer containing double chains incorporating pairs of edgesharing NdO9 polyhedra linked by glutarate dianions. <...> A network of O—H O and O—H Cl hydrogen bonds helps to consolidate the structure. <...> Compound 2 is a three-dimensional coordination polymer incorporating chains of edge-sharing PrO10 polyhedra. <...> Its glutarate ion adopts an extended conformation, whereas its hydrogen glutarate ion takes on a twisted conformation. <...> INTRODUCTION Glutaric acid HO2C(CH2)3CO2H (H2glut or C5H8O4) has applications in polymer chemistry [ 1 ] and can form liquid crystals [ 2 ]. <...> In this paper, as an extension of these studies, we describe the syntheses, characterizations, and single crystal structures of two rare-earth glutarate networks: [Nd(C5H6O4)(H2O)4]Cl (1) and [Pr(C5H6O4)(C5H7O4)(H2O)]H2O (2). <...> Five drops of a 1 N NaOH solution was added to raise the pH of the glutaric acid solution. <...> Eight drops of a 1 N NaOH solution was added to raise the pH of the glutaric acid solution. <...> For both structures, the C-bound H atoms were geometrically placed (C—H = 0.97 Е) and refined as riding atoms. <...> The water H atoms were located in difference maps and refined as riding atoms in their as-found relative positions. <...> The carboxylic acid H atom in 2 was located in a different map and its position freely was refined. <...> Molecular graphics were generated with ORTEP-3 [ 11 ] and ATOMS [12 ]. <...> These assignments are consistent with the different bonding modes of the glutarate ion in the crystal structure of 1 (vide infra). <...> A strong, very broad band centered around 3350 cm–1 in 1 corresponds to the O—H vibrations of hydrogen bonded water molecules and a cluster of weak, overlapped bands around 645 cm–1 can be tentatively assigned to Nd—O bond vibrations [ 14 ]. <...> The IR spectrum of 1 shows strong, sharp bands at 1640 cm–1, 1528 cm–1, and loss of 18 %, which was completed by 240 C. This is in good agreement with a decomposition scheme that loses the four water molecules from 1 (calc. = 19 %). <...> Compound 1 is <...>

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