- A single-step emulsion approach to prepare fluorescent nanoscale coordination polymers for bioimaging
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A crystalline nanoscale coordination polymer (NCP) based on fluorene and Zr4+ was synthesized through a simple microemulsion method. The emulsion method is facile and convenient for NCP production, the nanoparticles are fluorescent and thermal-
- Sun, Zhiyong,Li, Yangxue,Guan, Xingang,Sun, Tingting,Chen, Li,Xie, Zhigang,Jing, Xiabin
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- Self-assembled multilayers of CdSe nanocrystals and carboxylate-handled phenylene-based molecules: Optical, electrochemical and photoconductive properties
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A series of linear phenylene-based molecules, bearing carboxylic acid or carboxylate functionalities at both ends, were reacted with (hexadecylamine/ stearate)-capped CdSe nanocrystals (7.5 nm diameter) dispersed in CHCl 3 to form multilayers on ITO-glass surfaces via layer-by-layer (LBL) alternation. The new multilayered materials were investigated by UV-Vis spectroscopy, cyclic voltammetry, photoelectrochemistry and photoconductivity. The conjugated linkers, with reversible reduction potentials in the range -1.7 to -2.8 V vs. Ag/Ag+, ease charge transport between dots (LUMO at -1.4 V). Photoconduction is dominated by interdot distance and linker characteristics rather than by LUMO energy levels. The logarithm of photoconductivity and linker length are linearly related, as in conduction of molecular wires, and the tunnelling attenuation factor β value is 2.4 nm-1. Comparison of n-type aromatics and p-type oligothiophenes is discussed.
- Vercelli, Barbara,Zotti, Gianni,Berlin, Anna,Pasini, Mariacecilia,Natali, Marco
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supporting information; experimental part
p. 8645 - 8652
(2012/01/15)
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- Nanoscale light-harvesting metal-organic frameworks
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Highly crystalline nanoparticles of metal-organic frameworks with efficient light-harvesting properties were prepared by coordination-directed assembly (see picture). Functionalization of the ligands with long alkyl chains effectively stabilizes the nanoparticles and increases crystallinity. Different metal ions and ligands are organized into single nanoparticles and both organic acceptors and lanthanide ions can be co-sensitized within the frameworks. Copyright
- Zhang, Xuanjun,Ballem, Mohamed Ali,Hu, Zhang-Jun,Bergman, Peder,Uvdal, Kajsa
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supporting information; experimental part
p. 5729 - 5733
(2011/08/07)
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- Synthesis and photoluminescence properties of π-extended fluorene derivatives: the first example of a fluorescent solvatochromic nitro-group-containing dye with a high fluorescence quantum yield
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Functional π-extended fluorene derivatives, 2,7-di(p-substituted-phenyl)fluorenes containing different functional groups such as hydrogen, trimethylsilyl (TMS), methoxycarbonyl, cyano, and nitro groups, were synthesized. Except for the nitro group, the resulting compounds exhibited extremely high fluorescence quantum yields (ΦF >0.85 in chloroform). The diphenylfluorene containing nitro groups have higher fluorescence quantum yield (ΦF = 0.31 in N,N'-dimethyl-formamide) than other nitro-group-containing fluorophores which were previously reported (ΦF 0.1). Furthermore, this compound exhibited large Stokes' shift with green to orange emission and unique on-off behavior of the emission by solvents.
- Kotaka, Hidehiro,Konishi, Gen-ichi,Mizuno, Kazuhiko
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experimental part
p. 181 - 184
(2010/03/04)
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- Twin probes as a novel tool for the detection of single-nucleotide polymorphisms
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Single-nucleotide polymorphisms (SNPs) are the most common form of DNA sequence variation. There is a strong interest from both academy and industry to develop rapid, sensitive and cost effective methods for SNP detection. Here we report a novel structura
- Ergen, Erhan,Weber, Markus,Jacob, Josemon,Herrmann, Andreas,Muellen, Klaus
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p. 3707 - 3713
(2008/02/06)
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