Coordination polymer with a staircase molecular architecture: connecting binuclear Zn(II) bis-chelate platforms with bridging 4,4'-bipyridyl
D.V. Soldatov1, G.D. Enright2, I.E. Sokolov3
1Nikolaev Institute of Inorganic Chemistry, Siberian Division of the Russian Academy of Sciences, Novosibirsk, Russia
2Steacie Institute for Molecular Sciences, National Research Council, Ottawa, Canada
3Institute of Chemical Kinetics and Combustion, Siberian Division of the Russian Academy of Sciences, Novosibirsk, Russia
Ключевые слова: crystal engineering, crystal packing, wheel-and-axle, ladder-and-platform, tetraketone, b -diketonate, dimethylsulfoxide, modulated structure
Страницы: 332-338
Подраздел: СУПРАМОЛЕКУЛЯНЫЕ И НАНОРАЗМЕРНЫЕ СИСТЕМЫ
Аннотация
A new tetraketone ligand with two separatedb -diketone functions was prepared, 1,3-[CO-CH2-CO-C(CH3)2OCH3]2Ph (H2LiPrOMe). The title coordination polymer, [Zn2(LiPrOMe)2(DMSO)2(bipy)]n (DMSO = dimethylsulfoxide; bipy = 4,4¢ -bipyridyl), formed as the only crystalline product upon interaction of Zn(II) acetate, H2LiPrOMe and bipy in 1:1:1 to 1:1:5 molar ratios in DMSO as a solvent. A single crystal XRD study of the compound revealed a staircase polymeric architecture of the complex. The architecture is based on binuclear ¢ Zn2(LiPrOMe)2¢platforms where each Zn(II) cation is chealted by two b -diketonate groups of two LiPrOMe ligands in the equatorial plane, while each LiPrOMe ligand chelates two Zn(II) cations. The coordination environment of each Zn(II) is completed to a distorted octahedron by an O-atom of a terminal DMSO and an N-atom of bridging bipy ligands. The resulting staircase polymeric ribbons are packed in a self-inclusion mode as would be expected for van der Waals interactions. Most fragments of the molecule were found to be disordered over two equally populated orientations that was interpreted as evidence of a modulated structure. In addition, several fragments reveal additional minor disordering and high thermal motion.
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