Synthesis, structure, and properties of a new Co(II) diphosphonate based on auxiliary ligand 2,2'-bipyridine

Su, Haoqi; Ma, Kang; Kan, Yuhe; Qian, Xiao-Di; Hu, Huayou; Li, Rongqing

doi:10.1080/15533174.2016.1212218

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…(a) Phosphonate ligands display different coordination modes and can bridge several metal binding sites, thus yielding a phalanx of architectures . (b) Phosphonic acids (and their deprotonated forms) can coordinate virtually to any metal ion from the Periodic Table. − (c) Their sensitivity to pH offers the opportunity to perform syntheses in a wide spectrum of pH values, with different results. , (d) The “metal/phosphonate” system can accommodate other auxiliary ligands (such as N-heterocycles), thus altering the dimensionality and architecture of the resulting product. − (e) Metal phosphonate coordination polymers or complexes are usually stable and robust . Their stability is one of the reasons for their increasing use in catalysis.…”

Section: Introductionmentioning

confidence: 99%

Three-Component Copper-Phosphonate-Auxiliary Ligand Systems: Proton Conductors and Efficient Catalysts in Mild Oxidative Functionalization of Cycloalkanes

et al. 2018

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The synthesis, structural characterization, topological analysis, proton conductivity, and catalytic properties are reported of two Cu(II)-based compounds, namely a dinuclear Cu(II) complex [Cu(μ-VPA)(phen)(HO)]·8HO (1) (HVPA = vinylphosphonic acid, phen = 1,10-phenanthroline) and a 1D coordination polymer [Cu(μ-SO)(phen)(HO)] (2). Their structural features and H-bonding interactions were investigated in detail, showing that the metal-organic structures of 1 and 2 are extended by multiple hydrogen bonds to more complex 2D or 1D H-bonded architectures with the kgd [Shubnikov plane net (3.6.3.6)/dual] and SP 1-periodic net (4,4)(0,2) topology, respectively. These nets are primarily driven by the H-bonding interactions involving water ligands and HO molecules of crystallization; besides, the (HO)/(HO) clusters were identified in 1. Both 1 and 2 are moderate proton conductors, with proton conductivity values, σ = 3.65 × 10 and 3.94 × 10 S·cm, respectively (measured at 80 °C and 95% relative humidity). Compounds 1 and 2 are also efficient homogeneous catalysts for the mild oxidative functionalization of C-C cycloalkanes (cyclopentane, cyclohexane, cycloheptane, and cyclooctane), namely for the oxidation by HO to give cyclic alcohols and ketones and the hydrocarboxylation by CO/HO and SO to the corresponding cycloalkanecarboxylic acids as major products. The catalytic reactions proceed under mild conditions (50-60 °C) in aqueous acetonitrile medium, resulting in up to 34% product yields based on cycloalkane substrate.

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