Ag<sup>I</sup>‐Directed Triple‐Stranded Helicates with <i>meta</i>‐Ethynylpyridine Ligands

Li, Qiaolian; Huang, Fu Qiang; Fan, Yaxun; Wang, Yilin; Li, Jianfeng; He, Yi; Jiang, Hua

doi:10.1002/ejic.201402345

Cited by 7 publications

(2 citation statements)

References 85 publications

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“…We envisaged a self-assembly strategy based on noncovalent forces that would provide an efficient solution for some of these problems. Metal coordinative binding, one of the noncovalent forces, displays promise for constructing functional molecular devices, as exemplified by numerous elegant supramolecular systems on silver-mediated molecular rotary systems, helicates, and cages . In this contribution, we describe our self-assembly strategy for constructing novel molecular turnstiles and for regulating their bistability between an open and a closed form with metal ions as our continuous effort on functional molecular devices …”

Section: Introductionmentioning

confidence: 99%

Molecular Turnstiles Regulated by Metal Ions

et al. 2016

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A family of novel molecular turnstiles 1-3 composed of two stators with pyridyl binding sites and a different-sized triptycene rotor was synthesized. The molecular turnstiles behave in an open state at room temperature in the absence of metal ions but display significantly different closed states in the presence of Ag(+) and Pd(2+). The Ag(+)-mediated turnstiles 1-3Ag exhibited closed states but unreadable bistability at ambient temperature because the Ag(+)-mediated macrocyclic framework is not able to restrict the rotations of the rotors; while temperature was decreased, the macrocyclic frameworks became stable enough to halt the rotations of the rotors, eventually leading to the readable closed states for 1-3Ag. In contrast, Pd(2+)-mediated macrocyclic frameworks are stable, giving rise to a detectable closed state of turnstiles 1-3Pd in a wide range of temperatures. These findings have also been supported by DFT calculations.

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Section: Introductionmentioning

confidence: 99%

Molecular Turnstiles Regulated by Metal Ions

et al. 2016

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“…Helical structures have been commonly recognized as a highly valuable shape and are ubiquitous in nature ranging from macroscopic phenomena to biomolecular systems. − Motivated via aesthetical structures and biomimetic functions, an increasing contribution has been made by crystal engineers to design and synthesize molecular architectures that have capability to mimic biomacromolecules structurally and functionally. − In general, helical structures usually are formations of multidentate organic strands with the assistance of a coordinate effect of the metal center. However, an overwhelming majority of helical chains in biomacromolecules are mainly constructed through the cooperative interaction of abundant and complex noncovalent interactions instead of metal coordination .…”

Section: Introductionmentioning

confidence: 99%

Triple Helical Molecular Braid and Parallel Packed Wavy Chain-Based Supramolecular Organic Frameworks with Conformation- and Packing-Dependent Luminescent Properties

Xing

Fan

et al. 2016

Crystal Growth & Design

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Two three-dimensional supramolecular organic frameworks, [(H2bpdc)0.5(bipy)0.5] (1) and [(H3dpob)(bipy)·3H2O] (2), have been successfully constructed and structurally characterized (H2bpdc = 2,2′-biphenyldicarboxylic acid; H3dpob = 3-(2′,3′-dicarboxylphenoxy)benzonic acid; bipy = 4,4′-bipydine). 1 is driven by C–H···π hydrogen-bonded packing to three dimension. 2 origins form parallel-packed wavy chains and show π–π stacking-directed structure. After the SOFs are formed via weak noncovalent interaction, 1 and 2 show an enhancement in thermostability. The different conformations of bipy induced by weak noncovalent interactions are responsible for the huge dissimilarity of structural and luminescence behavior between them. Under the excitation of 365 nm ultraviolet light, 1 and 2 show stronger blue-white and green-white luminescent emissions in the solid state, respectively. In comparison with 2, supramolecular organic framework 1 shows superior performance in aggregation-induced emission (AIE) activity, which is explained and elaborated via the simple model from the viewpoint of planarity (Ψr) and rotatability (θr). Moreover, stimuli-responses behaviors to mechanical force were evaluated to explore stability of AIE materials, luminescent shift (Δλem ≈ 36 nm) was observed in 2, whereas almost no change of 1 was found. Subsequently, 1 doped poly(methyl methacrylate) film demonstrates the comparable intensity with the solid state at concentrations of 2.0%, accompanied by the improvement of thermal stability.

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Identification of Zr(iv)-based architectures generated from ligands incorporating the 2,2′-biphenolato unit

et al. 2016

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The structural identification in solution of the Zr(iv) complexes involving two 2,2-biphenol-based proligands is reported. The proligand L(1)H2 contains one 2,2-biphenol unit whereas L(2)H4 incorporates two 2,2-biphenol units linked by a para-phenylene bridge. Diffusion Ordered Spectroscopy (DOSY) combined with electrospray mass spectrometry analysis and density functional theory (DFT) allowed for determining the molecular structures of such Zr(iv)-based architectures. It is proposed that [Zr(OPr(i))4(HOPr(i))] in the presence of L(1)H2 generates an octahedral complex formulated as [ZrL(1)3H2]. Concerning the self-assembled architecture incorporating the L(2) ligand, the analytical data highlight the formation of an unprecedented neutral Zr(iv) triple-stranded helicate ([Zr2L(2)3H4]). Insight into the geometry of these complexes is obtained via DFT calculations. Remarkably, the helicate structure characterized in solution strongly contrasts with the triple-stranded structure of the complex that crystallizes.

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Ag^I‐Directed Triple‐Stranded Helicates with meta‐Ethynylpyridine Ligands

Cited by 7 publications

References 85 publications

Molecular Turnstiles Regulated by Metal Ions

Molecular Turnstiles Regulated by Metal Ions

Triple Helical Molecular Braid and Parallel Packed Wavy Chain-Based Supramolecular Organic Frameworks with Conformation- and Packing-Dependent Luminescent Properties

Identification of Zr(iv)-based architectures generated from ligands incorporating the 2,2′-biphenolato unit

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AgI‐Directed Triple‐Stranded Helicates with meta‐Ethynylpyridine Ligands

Cited by 7 publications

References 85 publications

Molecular Turnstiles Regulated by Metal Ions

Molecular Turnstiles Regulated by Metal Ions

Triple Helical Molecular Braid and Parallel Packed Wavy Chain-Based Supramolecular Organic Frameworks with Conformation- and Packing-Dependent Luminescent Properties

Identification of Zr(iv)-based architectures generated from ligands incorporating the 2,2′-biphenolato unit

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Ag^I‐Directed Triple‐Stranded Helicates with meta‐Ethynylpyridine Ligands