Reversible Phase Transfer of (CdSe/ZnS) Quantum Dots between Organic and Aqueous Solutions

Denis Dorokhin; Nikodem Tomczak; Mingyong Han; David N. Reinhoudt; Aldrik H. Velders; G. Julius Vancso

doi:10.1021/nn8006515

Reversible Phase Transfer of (CdSe/ZnS) Quantum Dots between Organic and Aqueous Solutions

Denis Dorokhin, Nikodem Tomczak, Mingyong Han, David N. Reinhoudt, Aldrik H. Velders, G. Julius Vancso

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Abstract

Ttrioctylphosphine oxide (TOPO) stabilized CdSe/ZnS quantum dots (QD) were modified with 6-ferrocenyl-1-hexanethiol (FcHT) or 11-ferrocenyl-1-undecanethiol (FcUT) via ligand exchange. The presence of ferrocenyl thiol ligands on the surface of the QDs was proven by diffusion ordered NMR spectroscopy. Upon replacement of the initial TOPO ligand with ferrocene derivatives the emission of the QDs decreased. Phase transfer of ferrocene-modified QDs from organic solvents into water was achieved by complexation reactions with β-cyclodextrin (β-CD). The QDs coated with ferrocene thiols are soluble in nonpolar solvents and are transferred into the aqueous phase upon formation of host−guest complexes between the ferrocene units and the cavity of β-CD. The reversibility of the phase transfer was probed by the addition of naphthalene and adamantane derivatives to the aqueous phase containing QD-[Fc-CD] adduct.

Original language	English
Pages (from-to)	661-667
Number of pages	8
Journal	ACS nano
Volume	3
Issue number	3
DOIs	https://doi.org/10.1021/nn8006515
Publication status	Published - 2009

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@article{0764945b6cab443b9e4b9afc91a22c47,

title = "Reversible Phase Transfer of (CdSe/ZnS) Quantum Dots between Organic and Aqueous Solutions",

abstract = "Ttrioctylphosphine oxide (TOPO) stabilized CdSe/ZnS quantum dots (QD) were modified with 6-ferrocenyl-1-hexanethiol (FcHT) or 11-ferrocenyl-1-undecanethiol (FcUT) via ligand exchange. The presence of ferrocenyl thiol ligands on the surface of the QDs was proven by diffusion ordered NMR spectroscopy. Upon replacement of the initial TOPO ligand with ferrocene derivatives the emission of the QDs decreased. Phase transfer of ferrocene-modified QDs from organic solvents into water was achieved by complexation reactions with β-cyclodextrin (β-CD). The QDs coated with ferrocene thiols are soluble in nonpolar solvents and are transferred into the aqueous phase upon formation of host−guest complexes between the ferrocene units and the cavity of β-CD. The reversibility of the phase transfer was probed by the addition of naphthalene and adamantane derivatives to the aqueous phase containing QD-[Fc-CD] adduct.",

author = "Denis Dorokhin and Nikodem Tomczak and Mingyong Han and Reinhoudt, {David N.} and Velders, {Aldrik H.} and Vancso, {G. Julius}",

year = "2009",

doi = "10.1021/nn8006515",

language = "English",

volume = "3",

pages = "661--667",

journal = "ACS nano",

issn = "1936-0851",

publisher = "American Chemical Society",

number = "3",

}

TY - JOUR

T1 - Reversible Phase Transfer of (CdSe/ZnS) Quantum Dots between Organic and Aqueous Solutions

AU - Dorokhin, Denis

AU - Tomczak, Nikodem

AU - Han, Mingyong

AU - Reinhoudt, David N.

AU - Velders, Aldrik H.

AU - Vancso, G. Julius

PY - 2009

Y1 - 2009

N2 - Ttrioctylphosphine oxide (TOPO) stabilized CdSe/ZnS quantum dots (QD) were modified with 6-ferrocenyl-1-hexanethiol (FcHT) or 11-ferrocenyl-1-undecanethiol (FcUT) via ligand exchange. The presence of ferrocenyl thiol ligands on the surface of the QDs was proven by diffusion ordered NMR spectroscopy. Upon replacement of the initial TOPO ligand with ferrocene derivatives the emission of the QDs decreased. Phase transfer of ferrocene-modified QDs from organic solvents into water was achieved by complexation reactions with β-cyclodextrin (β-CD). The QDs coated with ferrocene thiols are soluble in nonpolar solvents and are transferred into the aqueous phase upon formation of host−guest complexes between the ferrocene units and the cavity of β-CD. The reversibility of the phase transfer was probed by the addition of naphthalene and adamantane derivatives to the aqueous phase containing QD-[Fc-CD] adduct.

AB - Ttrioctylphosphine oxide (TOPO) stabilized CdSe/ZnS quantum dots (QD) were modified with 6-ferrocenyl-1-hexanethiol (FcHT) or 11-ferrocenyl-1-undecanethiol (FcUT) via ligand exchange. The presence of ferrocenyl thiol ligands on the surface of the QDs was proven by diffusion ordered NMR spectroscopy. Upon replacement of the initial TOPO ligand with ferrocene derivatives the emission of the QDs decreased. Phase transfer of ferrocene-modified QDs from organic solvents into water was achieved by complexation reactions with β-cyclodextrin (β-CD). The QDs coated with ferrocene thiols are soluble in nonpolar solvents and are transferred into the aqueous phase upon formation of host−guest complexes between the ferrocene units and the cavity of β-CD. The reversibility of the phase transfer was probed by the addition of naphthalene and adamantane derivatives to the aqueous phase containing QD-[Fc-CD] adduct.

U2 - 10.1021/nn8006515

DO - 10.1021/nn8006515

M3 - Article

SN - 1936-0851

VL - 3

SP - 661

EP - 667

JO - ACS nano

JF - ACS nano

IS - 3

ER -

Reversible Phase Transfer of (CdSe/ZnS) Quantum Dots between Organic and Aqueous Solutions

Abstract

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