CADMIUM(II) COMPLEX WITH (1?H-[2,2?]BIIMIDAZOLY-1-YL)-ACETIC ACID: SYNTHESIS, CRYSTAL STRUCTURE, AND LUMINESCENCE

Cd(II) complex crystal structure hydrogen bonding C—O…p interaction photoluminescence

КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА МОНОКЛИННЫХ МОДИФИКАЦИЙ ТРИГИДРАТОВ ТЕТРАФТОРИДОВ ЦИРКОНИЯ И ГАФНИЯ, Investigation of correlation between impact sensitivities and bond dissociation energies in benzenoid nitro compounds, ...

The [Cd(BDAC)2(H2O)2]ŒH2O units are further bridged by O—HᄷO, N—HᄷO, C—HᄷO hydrogen bonds, — stacking and C—Oᄷ interactions, generating a three-dimensional supramolecular structure. <...> In addition, luminescence measurements reveal that complex 1 exhibits strong fluorescent emission in the solid state at room temperature. <...> In particular, the coordination complexes of cadmium(II) are being studied [ 4—6 ]. <...> The most effective and facile approach to coordination polymers is to utilize multi-pyridine and dicarboxylate ligands to link metal ions [ 7—9 ]. <...> Among them, all kinds of imidazole and their derivatives have been extensively used in the synthesis of a metal organic framework (MOF) because of their diversified coordination modes and flexibility [ 10—13 ]. <...> However, relatively less attention has been paid to a new imidazole derivative ligand: (1H-[ 2,2]biimidazoly-1-yl)-acetic acid. <...> EXPERIMENTAL The HBDAC ligand was synthesized following the published procedure [ 14 ]. <...> An emission spectrum was recorded on a Hitachi F-4500 fluorescence spectrophotometer, using a 5 nm slit width and excitation at room temperature for the solid samples. <...> RESULTS AND DISCUSSION Single crystal X-ray diffraction revealed that complex 1 crystallized in the monoclinic space group P21/c with an asymmetric unit consisting of a cadmium atom on the crystallographic inversion center, one singly deprotonated HBDAC ligand, one aqua ligand, and a half-occupied crystallization water molecule. <...> Axial positions are filled by two aqua ligands. <...> As to the BDAC– anion, the dihedral angle between two imidazole rings is 11.3ē, and the pendant carboxylate group has the dihedral angles of 106.1ē relative to the plane of their linking aromatic ring. <...> Meanwhile, the 3D supramolecular structure is stabilized by — interactions between the adjacent imidazole rings in an offset fashion with the centroid—centroid distances in the range of 3.472—3.693 Е (Fig. 3). <...> Solid state emission spectrum of complex 1 at room temperature Fig. 5. <...> Solid state emission spectrum of the HBDAC ligand at room temperature ting that the carboxylate oxygen atoms do not bind Cd atoms. <...> H2O units are further bridged by O—H…O <...>

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