Photoinduced electron transfer in linked ruthenium(II) diimine-diquat complexes: linkage dependence

Ryu, Chong Kul; Wang, Renyi; Schmehl, Russell H.; Ferrere, Suzanne; Ludwikow, M.; Merkert, Jon W.; Headford, Christine E. L.; Elliott, C. Michael

doi:10.1021/ja00028a006

Cited by 70 publications

(56 citation statements)

References 3 publications

(3 reference statements)

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“…The polymer was precipitated in cold methanol and washed several times with n-hexane. The polymer was characterized by 1 …”

Section: Synthesis Of Regioregular Head-to-tail Poly(3-hexylthiophenementioning

confidence: 99%

“…[1][2][3][4] Photochromic SP compounds are molecules containing a condensed ring-substituted 2H- [1,4]oxazine in which the carbon atom in position 2 of the oxazine ring is involved in a spiro linkage. Under UV light irradiation, SP, in its colorless form, isomerizes to form the blue-colored merocyanine (MC) (or the open form) by homolytic cleavage of the carbon-oxygen single bond of the oxazine ring.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of diblock copolymers based on poly(3-hexylthiophene) and photo-responsive poly(methyl methacrylate-random-2-methyl methaspirooxazine)

Nguyên

Nguyen

2015

Designed Monomers and Polymers

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The rod-coil diblock copolymers combining the conductive feature of a conjugated polymer and nanoscale morphologies arising from microphase separation of dissimilar blocks are attractive as potential materials for electronic applications. Herein, we report on the synthesis and properties of a novel diblock copolymer containing a rod-block of regioregular poly(3-hexylthiophene) (P3HT) and poly(methyl methacrylate-random-2-methyl methaspirooxazine) (P3HT-b-P(MMA-rMSp)) as photo-responsive coil-block. Well-defined rod-coil P3HT-b-P(MMA-r-MSp) diblock copolymers with average molecular weight of around 10,000 and low molar mass dispersities (Ð M ) below 1.5 were successfully synthesized via the combination of quasi-living Grignard metathesis polymerization and atom transfer radical polymerization (ATRP). Post-polymerization end-group modifications of the as-obtained P3HT were then successfully realized to give a macroinitiator for the ATRP of MMA and MSp co-monomers, resulting in the P3HT-b-P(MMA-r-MSp) diblock copolymers. The structure and properties of the resulting diblock copolymers were characterized by proton nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography, Fourier transform infrared, UV-visible spectroscopy, and differential scanning calorimetry.

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“…The polymer was precipitated in cold methanol and washed several times with n-hexane. The polymer was characterized by 1 …”

Section: Synthesis Of Regioregular Head-to-tail Poly(3-hexylthiophenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of diblock copolymers based on poly(3-hexylthiophene) and photo-responsive poly(methyl methacrylate-random-2-methyl methaspirooxazine)

Nguyên

Nguyen

2015

Designed Monomers and Polymers

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“…Ru(bpy) 3 2+ and other Ru-polypyridines have been extensively studied as sensitizers of photochemical electron (15)(16)(17)(18)(19) and energy transfer (20)(21)(22)(23)(24) processes. Long lifetimes of their excited states make them useful tools for studying electron and energy transfer mechanisms via quenching of their luminescence.…”

Section: +mentioning

confidence: 99%

The quenching of electrochemiluminescence upon oligonucleotide hybridization

Spehar¹,

Koster²,

Kulmala³

et al. 2004

Luminescence

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Many genomic assays rely on a distance-dependent interaction between luminescent labels, such as luminescence quenching or resonance energy transfer. We studied the interaction between electrochemically excited Ru(bpy)(3) (2+) and Cy5 in a hybridization assay on a chip. The 3' end of an oligonucleotide was labelled with Ru(bpy)(3) (2+) and the 5' end of a complementary strand with Cy5. Upon the hybridization, the electrochemiluminescence (ECL) of Ru(bpy)(3) (2+) was efficiently quenched by Cy5 with a sensitivity down to 30 nmol/L of the Cy5-labelled complementary strand. The quenching efficiency is calculated to be 78%. A similar phenomenon was observed in a comparative study using laser-excitation of Ru(bpy)(3) (2+). The hybridization with the non-labelled complementary or labelled non-complementary strand did not change the intensity of the ECL signal. Resonance energy transfer, electron transfer and static quenching mechanisms are discussed. Our results suggest that static quenching and/or electron transfer are the most likely quenching mechanisms.

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“…Research into these dicationic species spearheaded the development of supramolecular science and led to the evolution of molecular devices. [2] Extensive studies into their properties in biological and photocatalytic systems, [3] and their molecular recognition capabilities further testify to the unique position of these privileged dications.…”

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confidence: 99%

“…[9] Thus, triyne 6 is prepared in high yield from the known pyridine precursor 5 (ref. [10]) and the key [2 + 2 + 2] cycloisomerization 6!4 is effected in minutes with Wilkinsons catalyst [RhA C H T U N G T R E N N U N G (PPh 3 ) 3 Cl] in acetonitrile under microwave conditions. The practicality of the protocol is underscored by the fact that a simple ethyl acetate wash of the crude product removes the catalyst affording helquat 4 as the triflate salt in good purity on milligram to gram scales.…”

mentioning

confidence: 99%