Fluorescent Gold Nanoparticles: Synthesis of Composite Materials of Two‐Component Disulfide Gels and Gold Nanoparticles

Yamamoto, Kōji; An, Zengjian; Saito, Nozomi; Yamaguchi, Masahiko

doi:10.1002/chem.201300659

Cited by 14 publications

(13 citation statements)

References 72 publications

(15 reference statements)

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“…Gold nanoparticles are interesting materials due to their unique chemical and physical properties , and they can be applied in many areas of science, e.g., medicine , catalysis , and materials engineering . Today, the process of particles synthesis is well known , and in principle it can be divided into chemical and physical methods .…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoparticles Formation via Au(III) Complex Ions Reduction with l -Ascorbic Acid

Luty–Błocho

Wojnicki

Fitzner

2017

Int. J. Chem. Kinet.

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In this paper, the kinetics and mechanism of gold nanoparticles formation during the redox reaction between [AuCl 4 ]¯complex and L-ascorbic acid under different conditions were described. It was also shown that reagent concentration, chloride ions, and pH influence kinetics of nucleation and growth. To establish rate constants of these stages, the model of Finke and Watzky was applied. From Arrhenius and Eyring dependencies, the values of activation energy (22.5 kJ mol −1 for the nucleation step and 30.3 kJ mol −1 for the growth step), entropy (about −228 J K −1 mol −1 for the nucleation step and −128 J K −1 mol −1 for the growth step), and enthalpy (19.8 kJ mol −1 for nucleation and 27.8 kJ mol −1 for particles growth) were determined. It was also shown that the disproporationation reaction had influence on the rate of nanoparticles formation and may have impact on final particles morphology. C 2017 Wiley Periodicals, Inc. Int J Chem Kinet 49: [789][790][791][792][793][794][795][796][797] 2017

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Section: Introductionmentioning

confidence: 99%

Gold Nanoparticles Formation via Au(III) Complex Ions Reduction with l -Ascorbic Acid

Luty–Błocho

Wojnicki

Fitzner

2017

Int. J. Chem. Kinet.

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“…Two-component gels composed of pseudoenantiomers, the (P)-trimer (P)-15 (n = 3)/(M)-tetramer (M)-15 (n = 4) or the (P)-tetramer (P)-15 (n = 4)/(M)-pentamer (M)-15 (n = 5), were prepared and treated with gold nanoparticles with an average diameter of 10 nm. The oligomers in the gels were grafted on the gold nanoparticles by gold-sulfur bonds, and they changed their structure on the nanoparticles surface when heated or cooled (69). The organic-inorganic composite materials exhibited fluorescence at 600−800 nm on irradiation at 365 nm (Fig.…”

Section: Pseudoenantiomeric Ethynylhelicene Acyclic Oligomersmentioning

confidence: 98%

Structure and Property Diversity of Chiral Helicene Oligomers

Saito

Shigeno

Yamaguchi

2015

Encyclopedia of Polymer Science and Technology

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alkylthio, and perfluoroalkyl groups. In addition, cyclization of helicene oligomers provides another method of obtaining diversity.A notable aspect in the diversity of helicene oligomers is that they can be connected to provide multidomain oligomers (Fig. 4). When two helicene oligomers are connected, they are referred to herein as homo-bidomain oligomers. Cyclic homo-bidomain oligomers are also conceivable. Hetero-multidomain oligomers can be obtained by connecting different structures of oligomers. Such manipulations provide a large diversity of structures.Because helicene can generate characteristic π−π interactions, helicene oligomers often form bimolecular, trimolecular, tetramolecular, and polymolecular aggregates in which homoaggregation and heteroaggregation can also occur. Such aggregates self-assemble to form fibrils, vesicles, liquid crystals, and surface monolayers. These noncovalent bonding interactions provide diversity of the structure of helicene oligmers. Diverse Properties of Helicene OligomersStructural diversity is directly related to diversity of properties, and the properties of a helicene oligomer can be varied by structural modifications. In addition, multidomain oligomers can be designed, in which properties A and B of each domain can be combined. Such compounds exhibit property A + B or even another property C, a result regarded as the "synthesis of a property or function." Aggregation and self-assembly of helicene oligomers further increase property diversity, which covers materials with a broad range of sizes from subnanometersized molecules through nano-and micrometer-sized molecular aggregates and molecular self-assemblies to macroscopic bulk materials. Helicene oligomers are sensitive to changes in the environment such as temperature, solvent, and concentration. Different properties appear in dilute solution, in concentrated Amidohelicene oligomers: (a) acylcic oligomers (P)-1 (n = 1−9) with dianiline spacer, cyclic oligomers (P)-2 (n = 1−10) with dianiline spacer, (b) acyclic oligomers (P)-3 (n = 1−9) with m-phenylene spacer, and acyclic reverse oligomers (P)-4 (n = 1−4). (c) Schematic representation of reversible change between helix dimer and random coils of (P)-3 and (P)-4. solution, in the crystalline state, in the amorphous state, on the solid surface, at the solid-liquid interface, in fiber assemblies, in liquid crystals, and in gels. Dynamic properties of helicene oligomers are also interesting, and structural changes are largely affected by the environment, providing a stimulus response or possible molecular switching materials. It is also noteworthy that the process of a structure change can produce unusual transient phenomena. Amidohelicene OligomersStudies on helicene oligomers were initiated with amide derivatives (Fig. 5a, top), in which the spacer has a bent shape and includes both hydrogen bonding donor and acceptor moieties (24). (P)-5,8-Helicenedicarboxylate was reacted with bis(2,6-dimethylanilino)cyclohexane to give a series of acyclic helicene oligomers 1 up t...

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“…Gold nanoparticles with average diameters of 10 nm were reacted with a mixture of the ethynylhelicene ( P )-trimer and ( M )-tetramer disulfides ( Figure 33 ), which formed hetero-double-helices on solid surfaces and self-assembly gels in solution [ 104 ].…”

Section: Self-assembly Of Nanoparticles With Double-helix Chiral Cmentioning

confidence: 99%

Synthesis and Self-Assembly of Chiral Cylindrical Molecular Complexes: Functional Heterogeneous Liquid-Solid Materials Formed by Helicene Oligomers

Saito

Yamaguchi

2018

Molecules

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Chiral cylindrical molecular complexes of homo- and hetero-double-helices derived from helicene oligomers self-assemble in solution, providing functional heterogeneous liquid-solid materials. Gels and liotropic liquid crystals are formed by fibril self-assembly in solution; molecular monolayers and fibril films are formed by self-assembly on solid surfaces; gels containing gold nanoparticles emit light; silica nanoparticles aggregate and adsorb double-helices. Notable dynamics appears during self-assembly, including multistep self-assembly, solid surface catalyzed double-helix formation, sigmoidal and stairwise kinetics, molecular recognition of nanoparticles, discontinuous self-assembly, materials clocking, chiral symmetry breaking and homogeneous-heterogeneous transitions. These phenomena are derived from strong intercomplex interactions of chiral cylindrical molecular complexes.

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Fluorescent Gold Nanoparticles: Synthesis of Composite Materials of Two‐Component Disulfide Gels and Gold Nanoparticles

Cited by 14 publications

References 72 publications

Gold Nanoparticles Formation via Au(III) Complex Ions Reduction with l -Ascorbic Acid

Gold Nanoparticles Formation via Au(III) Complex Ions Reduction with l -Ascorbic Acid

Structure and Property Diversity of Chiral Helicene Oligomers

Synthesis and Self-Assembly of Chiral Cylindrical Molecular Complexes: Functional Heterogeneous Liquid-Solid Materials Formed by Helicene Oligomers

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