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2,217 Newest Publications about the topic dyes

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Comparison of Methods and Achievable Uncertainties for the Relative and Absolute Measurement of Photoluminescence Quantum Yields

07-04-2011 | Christian Würth; Markus Grabolle; Jutta Pauli; Monika Spieles; Ute Resch-Genger, Analytical Chemistry, 2011

The photoluminescence quantum yield (Φf) that presents a direct measure for the efficiency of the conversion of absorbed photons into emitted photons is one of the spectroscopic key parameters of functional fluorophores. It determines the suitability of such materials for applications in, for ...

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Design and Synthesis of a New Class of Membrane-Permeable Triazaborolopyridinium Fluorescent Probes

07-04-2011 | Sudath Hapuarachchige; Gilbert Montaño; Chinnasamy Ramesh; Delany Rodriguez; Lauren H. Henson; Casey C. Willia ..., Journal of the American Chemical Society, 2011

A new class of fluorescent triazaborolopyridinium compounds was synthesized from hydrazones of 2-hydrazinylpyridine (HPY) and evaluated as potential dyes for live-cell imaging applications. The HPY dyes are small, their absorption/emission properties are tunable through variation of pyridyl or ...

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Synthesis and application of alkyl-substituted red dyes for unmodified polypropylene fibers

06-04-2011 | Taekyeong Kim, Kyungjin Jang, Seonhee Jeon, Fibers and Polymers, 2011

Following the previous studies regarding blue and yellow dyes, a series of new red dyes having different length of alkyl substituents on the same chromophore were synthesized in order to dye unmodified polypropylene fiber. The affinity of the dyes onto unmodified polypropylene fiber was increased ...

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Marcus-like Inversion in Electron Transfer in Neat Ionic Liquid and Ionic Liquid-Mixed Micelles

05-04-2011 | Atanu Kumar Das; Tridib Mondal; Supratik Sen Mojumdar; Kankan Bhattacharyya, Journal of Physical Chemistry B, 2011

Ultrafast photoinduced electron transfer (PET) from N,N-dimethylaniline (DMA) to coumarin dyes in a room-temperature ionic liquid (RTIL, [pmim][BF4]) and in a mixed micelle containing the RTIL and a triblock copolymer, (PEO)20−(PPO)70−(PEO)20, (Pluronic P123) is studied using femtosecond ...

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Effect of microencapsulation on dyeing behaviors of disperse dyes without auxiliary solubilization

05-04-2011 | Yan, Luo; Yi, Zhong; Ben, Zhang; Juan, Du; Shuilin, Chen, Journal of Applied Polymer Science, 2011

Abstract Microencapsulated disperse dye can be used to dye hydrophobic fabric in the absence of auxiliaries and without reduction clearing. However, little available information for dyeing practice is provided with respect to the effect of microencapsulation on the dyeing behaviors of disperse ...

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The synthesis and 1O2 photosensitization of halogenated asymmetric aniline-based squaraines

05-04-2011 | Chao Luo; Qianxiong Zhou; Guoyu Jiang; Liqing He; Baowen Zhang; Xuesong Wang, New Journal of Chemistry, 2011

The halogenated (brominated or iodinated) squaraines have promising potential in the application of photodynamic therapy (PDT). Though aniline-based squaraines are the most classical squaraine dyes, no halogenated derivatives with the halogen atoms directly incorporated in the conjugation ...

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Synthesis and Spectroscopic Properties of Fused‐Ring‐Expanded Aza‐Boradiazaindacenes

04-04-2011 | Hua Lu; Soji Shimizu; John Mack; Zhen Shen; Nagao Kobayashi, Chemistry - An Asian Journal, 2011

Abstract A series of fused‐ring‐expanded aza‐boradiazaindacene (aza‐BODIPY) dyes have been synthesized by reacting arylmagnesium bromides with phthalonitriles or naphthalenedicarbonitriles. An analysis of the structure–property relationships has been carried out based on X‐ray crystallography, ...

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Multifunctional Trackable Dendritic Scaffolds and Delivery Agents

04-04-2011 | Amir, Roey J.; Albertazzi, Lorenzo; Willis, Jenny; Khan, Anzar; Kang, Taegon; Hawker, Craig J., Angewandte Chemie International Edition, 2011

Dual action: Trackable multifunctional dendritic scaffolds with high internal loading capacity were synthesized based on a PEG core. Orthogonal functionalization of chain‐end and internal groups allowed the dendrimers to be both labeled and loaded with releasable dyes for simultaneous monitoring ...

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J‐Aggregates: From Serendipitous Discovery to Supramolecular Engineering of Functional Dye Materials

04-04-2011 | Würthner, Frank; Kaiser, Theo E.; Saha‐Möller, Chantu R., Angewandte Chemie International Edition, 2011

Abstract J‐aggregates are of significant interest for organic materials conceived by supramolecular approaches. Their discovery in the 1930s represents one of the most important milestones in dye chemistry as well as the germination of supramolecular chemistry. The intriguing optical properties ...

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Triplication of the Photocurrent in Dye Solar Cells by Increasing the Elongation of the π‐conjugation in Zn‐Porphyrin Sensitizers

04-04-2011 | Barea, Eva M.; Caballero, Rubén; López‐Arroyo, Leticia; Guerrero, Antonio; de la Cruz, Pilar; L ..., ChemPhysChem, 2011

Abstract Porphyrins are promising sensitizers for dye solar cells (DSCs) but narrow absorption bands at 400–450 and 500–650 nm limit their light‐harvesting properties. Increasing elongation of the π‐conjugation and loss of symmetry causes broadening and a red‐shift of the absorption bands, ...

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