Point-to-point capture of DNA with the aid of intercalation by immobilized rod-shaped Ru complexes at solid surface towards nanowiring

Haga, Masa‐aki; Ohta, M.; Machida, Haruhiko; Chikira, Makoto; Tonegawa, Naoya

doi:10.1016/j.tsf.2005.07.204

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…The attachment of DNA to the support is then usually based on weak non-covalent interactions such as hydrogen bonds, p-p interaction, intercalation, groove binding, van der Waals interaction, and hydrophobic interaction. [55][56][57] Further approaches include electrostatic methodology and layerby-layer (LBL) assembly methods. Representative examples of the electrostatic methodology are e.g.…”

Section: Physisorptionmentioning

confidence: 99%

“…The use of such metalorganic complexes is sometimes advantageous because of their rigidity and ease to monitor electron or energy transfer processes induced by photoexcitation. For example, recently, Haga et al 40,57,79 reported point-to-point capture of DNA with the aid of intercalation by immobilized rod-shaped ruthenium polypyridyl complexes at the solid mica surface as shown in Fig. 4.…”

Section: Physisorptionmentioning

confidence: 99%

“…4 Immobilization of DNA by intercalation through ruthenium polypyridyl complexes. 40,57,79 The intercalating group can be either naphthalene (a) 57 or acridine (b). 79 gold.…”

Section: Covalent Immobilizationmentioning

confidence: 99%

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DNA immobilization, delivery and cleavage on solid supports

et al. 2011

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Section: Physisorptionmentioning

confidence: 99%

Section: Physisorptionmentioning

confidence: 99%

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DNA immobilization, delivery and cleavage on solid supports

et al. 2011

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“…Recently, we reported point-to-point DNA nanowires on a mica surface, by using a Ru complex bearing naphthalene-1,4:5,8-bis(dicarboximide) (ndi) as a dsDNA intercalating site. , The Ru complex was fixed by two alkyl phosphonate anchoring groups on the mica surface. Double-stranded λ-DNA was captured by the Ru complex in a point-to-point extended manner.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of DNA Nanowires by Orthogonal Self-Assembly and DNA Intercalation on a Au Patterned Si/SiO₂ Surface

et al. 2008

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A novel Ru complex bearing both an acridine group and anchoring phosphonate groups was immobilized on a surface in order to capture double-stranded DNAs (dsDNAs) from solution. At low surface coverage, the atomic force microscopy (AFM) image revealed the "molecular dot" morphology with the height of the Ru complex ( approximately 2.5 nm) on a mica surface, indicating that four phosphonate anchor groups keep the Ru complex in an upright orientation on the surface. Using a dynamic molecular combing method, the DNA capture efficiency of the Ru complex on a mica surface was examined in terms of the effects of the number of molecular dots and surface hydrophobicity. The immobilized surface could capture DNAs; however, the optimal number of molecular dots on the surface as well as the optimal pull-up speed exist to obtain the extended dsDNAs on the surface. Applying this optimal condition to a Au-patterned Si/SiO 2 (Au/SiO 2) surface, the Au electrode was selectively covered with the Ru complex by orthogonal self-assembly of 4-mercaptbutylphosphonic acid (MBPA), followed by the formation of a Zr (4+)-phosphonate layer and the Ru complex. At the same time, the remaining SiO 2 surface was covered with octylphosphonic acid (OPA) by self-assembly. The selective immobilization of the Ru complex only on the Au electrode was identified by time-of-flight secondary-ion mass spectrometry (TOF-SIMS) imaging on the chemically modified Au/SiO 2 surface. The construction of DNA nanowires on the Au/SiO 2 patterned surface was accomplished by the molecular combing method of the selective immobilized Ru complex on Au electrodes. These interconnected nanowires between Au electrodes were used as a scaffold for the modification of Pd nanoparticles on the DNA. Furthermore, Cu metallization was achieved by electroless plating of Cu metal on a priming of Pd nanoparticles on the Pd-covered DNA nanowires. The resulting Cu nanowires showed a metallic behavior with relatively high resistance.

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Supramolecular Organization of Light‐Harvesting Porphyrin Macrorings

Satake

Azuma

Kuramochi

et al. 2010

Chemistry A European J

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Porphyrin-based supramolecular nanostructures have been produced by the self-assembly of porphyrin macrorings with three benzoic acid groups (Acid-R) on each side of the rings through cooperative carboxyl-carboxyl hydrogen bonds. Structures of the organized Acid-R were analyzed by AFM, and two clear distribution peaks were observed at 3 and 27 nm in the height-distribution histogram. From the overall assessment, the higher objects are considered to be one-dimensional structures standing vertically on the mica substrate. The height corresponds to an 11-mer of a unit Acid-R. Light-harvesting functions were examined by using fluorescence titration, whereby an energy-acceptor molecule (Tripod 2) was employed that strongly interacted with Acid-R units (association constant: 2.0×10(8) M(-1) ), specifically from the inner pore. The titration results showed that the apparent stoichiometry [Tripod 2]/[Acid-R] was <0.5, and that the value was concentration dependent. Titration results reasonably account for the scheme in which Tripod 2 only interacts with each terminal in the organized Acid-R. The number of organization was fitted to a 10-mer of Acid-R in a 6.8×10(-7) M solution, and was consistent with that estimated from the AFM results. In the composites of organized Acid-R/Tripod 2, a singlet excitation energy transfer occurred among the Acid-R units, and to Tripod 2. The energy-transfer rate constants were estimated by using the decamer model, which employed kinetic parameters obtained from steady-state and time-resolved fluorescence experiments.

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Point-to-point capture of DNA with the aid of intercalation by immobilized rod-shaped Ru complexes at solid surface towards nanowiring

Cited by 13 publications

References 26 publications

DNA immobilization, delivery and cleavage on solid supports

DNA immobilization, delivery and cleavage on solid supports

Fabrication of DNA Nanowires by Orthogonal Self-Assembly and DNA Intercalation on a Au Patterned Si/SiO₂ Surface

Supramolecular Organization of Light‐Harvesting Porphyrin Macrorings

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Point-to-point capture of DNA with the aid of intercalation by immobilized rod-shaped Ru complexes at solid surface towards nanowiring

Cited by 13 publications

References 26 publications

DNA immobilization, delivery and cleavage on solid supports

DNA immobilization, delivery and cleavage on solid supports

Fabrication of DNA Nanowires by Orthogonal Self-Assembly and DNA Intercalation on a Au Patterned Si/SiO2 Surface

Supramolecular Organization of Light‐Harvesting Porphyrin Macrorings

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Product

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Fabrication of DNA Nanowires by Orthogonal Self-Assembly and DNA Intercalation on a Au Patterned Si/SiO₂ Surface