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Smith RJ, Gorman C, Menegatti S. Synthesis, structure, and function of internally functionalized dendrimers. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ryan J. Smith
- Department of Chemistry North Carolina State University Raleigh North Carolina USA
| | - Christopher Gorman
- Department of Chemistry North Carolina State University Raleigh North Carolina USA
| | - Stefano Menegatti
- Department of Chemical and Biomolecular Engineering North Carolina State University Raleigh North Carolina USA
- Biomanufacturing Training and Education Center Raleigh North Carolina USA
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2
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Non-catalyzed addition of heterocyclic thiols and 5-substituted-1H-tetrazoles to vinyl ethers. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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4
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The molybdenum and rhenium octahedral cluster chalcohalides in solid state chemistry: From condensed to discrete cluster units. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.07.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Pani RC, Yingling YG. Role of Solvent and Dendritic Architecture on the Redox Core Encapsulation. J Phys Chem A 2012; 116:7593-9. [DOI: 10.1021/jp304253g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Rakhee C. Pani
- Department
of Materials Science and Engineering, North Carolina State University, 911
Partners Way, Raleigh, North Carolina 27695, United States
| | - Yaroslava G. Yingling
- Department
of Materials Science and Engineering, North Carolina State University, 911
Partners Way, Raleigh, North Carolina 27695, United States
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6
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Affiliation(s)
- George R. Newkome
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
| | - Carol Shreiner
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
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7
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Yoshimura T, Ikai T, Takayama T, Sekine T, Kino Y, Shinohara A. Synthesis, Spectroscopic and Electrochemical Properties, and Electronic Structures of Octahedral Hexatechnetium(III) Clusters [Tc6Q8(CN)6]4− (Q = S, Se). Inorg Chem 2010; 49:5876-82. [DOI: 10.1021/ic1000717] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takashi Yoshimura
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Takuya Ikai
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Tsutomu Takayama
- Department of Chemistry, Daido University, Nagoya, Aichi 457-8530, Japan
| | - Tsutomu Sekine
- Center for the Advancement of Higher Education, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Yasushi Kino
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Atsushi Shinohara
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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8
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Kahnt A, Heiniger LP, Liu SX, Tu X, Zheng Z, Hauser A, Decurtins S, Guldi DM. An electrochemical and photophysical study of a covalently linked inorganic-organic dyad. Chemphyschem 2010; 11:651-8. [PMID: 20052701 DOI: 10.1002/cphc.200900728] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A molecular donor-acceptor dyad comprising a hexarhenium cluster core, [Re(6)(mu(3)-Se)(8)](2+), and a fullerene moiety which are covalently linked through a pyridine ligand was synthesized and fully characterized. The electrochemical and photophysical properties are reported. The detailed study includes cyclic voltammetry, steady-state absorption and fluorescence spectroscopy, radiation chemistry and transient absorption spectroscopy. A light-induced electron transfer between the inorganic cluster moiety and the fullerene can be excluded. However, a light-induced energy transfer from the rhenium cluster to the fullerene is proposed.
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Affiliation(s)
- Axel Kahnt
- Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany
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9
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Schubert D, Corda M, Lukin O, Brusilowskij B, Fiškin E, Schalley CA. A Topological View of Isomeric Dendrimers. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800408] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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Design, Syntheses, and Characterization of a Sterically Encumbered Dioxo Molybdenum (VI) Core. Inorganica Chim Acta 2007; 360:2092-2099. [PMID: 18425212 DOI: 10.1016/j.ica.2006.10.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dioxo-Mo(VI) complexes of general formula Tp*MoO(2)(p-SC(6)H(4)Dn) (6a-6c) (where Tp* = hydrotris(3,5-dimethyl-pyrazol-1-yl)borate and Dn= dendritic unit) have been synthesized and characterized by spectroscopy and mass spectrometry. (1)H NMR spectra of the metal complexes indicate that the C(s) local symmetry about the metal core does not change by the incorporation of dendritic functionality at the thiophenolato ring. Electrochemical data show ∼20 mV change in the redox potential in the complexes with dendritic ligands suggesting a very small perturbation in the redox orbital, which is also supported by small changes in the electronic spectra. The peak-to peak separation (ΔE(p)) increases from 125 mV in 6(a) to 240 mV in 6(c), suggesting sluggish electron transfer in molecules with larger dendritic ligands.
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11
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Gabriel CJ, Dematteo MP, Paul NM, Takaya T, Gustafson TL, Hadad CM, Parquette JR. A New Class of Intramolecularly Hydrogen-Bonded Dendrons Based on a 2-Methoxyisophthalamide Repeat Unit. J Org Chem 2006; 71:9035-44. [PMID: 17109527 DOI: 10.1021/jo061351k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis and conformational properties of folded dendrons based on a 2-methoxyisophthalamide (2-OMe-IPA) repeat unit are described. The hydrodynamic properties of dendrons preorganized via the syn-syn conformational preference of 2-methoxyisophthalamide are compared with 2,6-pyridinedicarboxamide (2,6-pydic) analogues. The effect of subtle differences in the nature of the conformational equilibria that exist within the 2-OMe-IPA and 2,6-pydic repeat units on the global structural properties of the corresponding dendrons was explored computationally, by (1)H-DOSY NMR spectroscopy and time-resolved fluorescence anisotropy (TRFA) measurements. Whereas the syn-syn preference of the 2-OMe-IPA branched repeat unit is stabilized entirely by intramolecular hydrogen-bonding interactions, this preference in the 2,6-pydic system is a consequence of both intramolecular hydrogen-bonding and dipole minimization effects. However, nonspecific solvophobic compression is more important in determining hydrodynamic properties than solvent-dependent shifts in the conformational equilibria of the repeat unit for both dendron series.
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Affiliation(s)
- Christopher J Gabriel
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA
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12
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Appoh FE, Thomas DS, Heinz-Bernhard Kraatz*. Chirality and Encapsulation Properties of Disubstituted Ferrocene−Peptide Dendrimers. Macromolecules 2006. [DOI: 10.1021/ma060525x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francis E. Appoh
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada
| | - Donald S. Thomas
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada
| | - Heinz-Bernhard Kraatz*
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada
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13
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Roland BK, Flora WH, Selby HD, Armstrong NR, Zheng Z. Dendritic Arrays of [Re6(μ3-Se)8]2+ Core-Containing Clusters: Exploratory Synthesis and Electrochemical Studies. J Am Chem Soc 2006; 128:6620-5. [PMID: 16704262 DOI: 10.1021/ja057548w] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction between the previously reported site-differentiated cluster solvate [Re(6)(mu(3)-Se)(8)(PEt(3))(5)(MeCN)](SbF(6))(2) (1) with pyridyl-based ditopic ligands 4,4'-trimethylenedipyridine (2), 1,2-bis(4-pyridyl)ethane (3), and (E)-1,2-bis(4-pyridyl)ethene (4) afforded cluster complexes of the general formula [Re(6)(mu(3)-Se)(8)(PEt(3))(5)(L)](SbF(6))(2) (5-7), where L represents one of the pyridyl-based ligands. Reacting these cluster complex-based ligands with the fully solvated cluster complex [Re(6)(mu(3)-Se)(8)(MeCN)(6)](SbF(6))(2) (8) produced dendritic arrays of the general formula {Re(6)(mu(3)-Se)(8)[Re(6)(mu(3)-Se)(8)(PEt(3))(5)(L)](6)}(SbF(6))(14) (9-11), each featuring six circumjacent [Re(6)(mu(3)-Se)(8)(PEt(3))(5)](2+) units bridged to a [Re(6)(mu(3)-Se)(8)](2+) core cluster by the pyridyl-based ligands. Electrochemical studies using a thin-layer electrochemical cell revealed cluster-based redox events in these cluster arrays. For 9 (L = 2), one reversible oxidation event corresponding to the removal of 7 electrons was observed, indicating noninteraction or extremely weak interactions between the clusters. For 10 (L = 3), two poorly resolved oxidation waves were found. For 11 (L = 4), two reversible oxidation events, corresponding respectively to the removal of 1 and 6 electrons, were observed with the 1-electron oxidation event occurring at a potential 150 mV more positive than the 6-electron oxidation. These electrochemical studies suggest intercluster coupling in 11 via through-bond electronic delocalization, which is consistent with electronic spectroscopic studies of this same molecule.
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Affiliation(s)
- Bryan K Roland
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
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14
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Angurell I, Lima JC, Rodríguez LI, Rodríguez L, Rossell O, Seco M. Metallodendrimers containing both ruthenium (internal layer) and rhenium (external layer). NEW J CHEM 2006. [DOI: 10.1039/b518356a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Briñas RP, Troxler T, Hochstrasser RM, Vinogradov SA. Phosphorescent oxygen sensor with dendritic protection and two-photon absorbing antenna. J Am Chem Soc 2005; 127:11851-62. [PMID: 16104764 PMCID: PMC2441878 DOI: 10.1021/ja052947c] [Citation(s) in RCA: 232] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Imaging oxygen in 3D with submicron spatial resolution can be made possible by combining phosphorescence quenching technique with multiphoton laser scanning microscopy. Because Pt and Pd porphyrin-based phosphorescent dyes, traditionally used as phosphors in biological oxygen measurements, exhibit extremely low two-photon absorption (2PA) cross-sections, we designed a nanosensor for oxygen, in which a 2P absorbing antenna is coupled to a metalloporphyrin core via intramolecular energy transfer (ET) with the purpose of amplifying the 2PA induced phosphorescence of the metalloporphyrin. The central component of the device is a polyfunctionalized Pt porphyrin, whose triplet state emission at ambient temperatures is strong, occurs in the near infrared and is sensitive to O2. The 2PA chromophores are chosen in such a way that their absorption is maximal in the near infrared (NIR) window of tissue (e.g., 700-900 nm), while their fluorescence is overlapped with the absorption band(s) of the core metalloporphyrin, ensuring an efficient antenna-core resonance ET. The metalloporphyrin-antenna construct is embedded inside the protecting dendritic jacket, which isolates the core from interactions with biological macromolecules, controls diffusion of oxygen and makes the entire sensor water-soluble. Several Pt porphyrin-coumarin based sensors were synthesized and their photophyics studied to evaluate the proposed design.
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Affiliation(s)
- Raymond P Briñas
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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16
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Appoh FE, Thomas DS, Kraatz HB. Glutamic Acid Dendrimers Attached to a Central Ferrocene Core: Synthesis and Properties. Macromolecules 2005. [DOI: 10.1021/ma050531d] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francis E. Appoh
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Donald S. Thomas
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Heinz-Bernhard Kraatz
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
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17
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Smith DK, Hirst AR, Love CS, Hardy JG, Brignell SV, Huang B. Self-assembly using dendritic building blocks—towards controllable nanomaterials. Prog Polym Sci 2005. [DOI: 10.1016/j.progpolymsci.2005.01.006] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Ong W, Grindstaff J, Sobransingh D, Toba R, Quintela JM, Peinador C, Kaifer AE. Electrochemical and Guest Binding Properties of Fréchet- and Newkome-Type Dendrimers with a Single Viologen Unit Located at Their Apical Positions. J Am Chem Soc 2005; 127:3353-61. [PMID: 15755152 DOI: 10.1021/ja049530b] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Several new series of dendrimers containing a single redox-active 4,4'-bipyridinium (viologen) residue were synthesized and characterized. In these dendrimers, the viologen group is covalently attached to the apical position of a Newkome- or Frechet-type dendron, ranging in size from first to third generation of growth. The half-wave potentials corresponding to the two consecutive one-electron reductions of the viologen residue are affected by the size of the dendritic component. The size effects are more pronounced in the Newkome-type dendrimers and seem to result from the polarity contrast between the microenvironments provided by the solution and the internal phase of the dendrimer. Unlike in many other dendrimers having a redox-active core, the voltammetric behavior remains fast (reversible) even in third generation dendrimers. Pulse gradient stimulated echo NMR diffusion coefficient measurements on the Newkome-type dendrimers reveal that their hydrodynamic radii are relatively invariant in solvents of widely different polarities (dichloromethane to dimethyl sulfoxide). The host-guest binding interactions between the viologen residue in these dendrimers and the crown ether host bis-p-phenylene-34-crown-8 were also investigated. While in Newkome-type dendrimers the growth of the dendron caused a substantial attenuation of the binding constant values, this size effect was not observed in the Frechet-type dendrimers. These electrochemical and binding measurements underscore some of the structural differences between these two common types of dendritic architectures.
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Affiliation(s)
- Winston Ong
- Center for Supramolecular Science and Department of Chemistry, University of Miami, Coral Gables, Florida 33124-0431, USA
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19
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Chessa G, Canovese L, Visentin F, Santo C, Seraglia R. Synthesis of poly(pyridylthioether) dendrimers incorporating a Fe2(CO)6 cluster core. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.12.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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