New diketopyrrolopyrrole (DPP) derivative as fluorescent probe for Zn2+
摘要:
New turn-on fluorescent probe DPPL2, was rationally designed and synthesized based on the skeleton of diketopyrrolopyrrole (DPP), which presented sensitivity, selectivity for Zn2+ over other metal ions except some disturbance with Cd2+. Particularly, results demonstrated fluorescence enhancement and blue shift of DPPL2 upon Zn2+ binding. This phenomenon was a typical photoinduced electron transfer (PET) and intramolecular charge transfer (ICT) process which was attributed to diminishing the electron of the nitrogen lone pair delocalization on the DPP core upon Zn2+ binding. For comparison, DPPL3 (acylation of nitrogen atom of DPPL2) was synthesized and no fluorescence enhancement was observed, which further indicated that lone pair electrons of nitrogen atoms attached to DPP core were ascribed to PET process. H-1 NMR titrations and DFT calculations also proved that PET and ICT process of system. (C) 2013 Elsevier Ltd. All rights reserved.
12-, 15-, and 18-Membered-ring nitrogen-pivot lariat ethers: syntheses, properties, and sodium and ammonium cation binding properties
作者:Rose Ann Schultz、Banita D. White、Dennis M. Dishong、Kristin A. Arnold、George W. Gokel
DOI:10.1021/ja00309a039
日期:1985.11
Preparation de pres de 50 etherslariat par cyclisation d'une amine ou d'un diol convenablement substitue. Formation de complexes avec lesions Na et NH 4
制备 de pres de 50 ethers lariat par cyclisation d'une amine ou d'un diol convenablement substitue。形成复合物 avec 病变 Na et NH 4
The Influence of Linker Geometry in Bis(3-hydroxy-N-methyl-pyridin-2-one) Ligands on Solution Phase Uranyl Affinity
作者:Géza Szigethy、Kenneth N. Raymond
DOI:10.1002/chem.201002372
日期:2011.2.7
unsubstituted reference ligands. Uranylaffinity was found to follow no discernable trends with incremental geometric modification. The butyl‐linked 4 li‐Me‐3,2‐HOPO ligand exhibited the highest uranylaffinity, consistent with prior in vivo decorporation results. Of the rigidly‐linkedligands, the o‐phenylene linker imparted the best uranylaffinity to the bis‐Me‐3,2‐HOPO ligand platform.
Templated Hierarchical Self-Assembly of Poly(<i>p</i>-aryltriazole) Foldamers
作者:Rueben Pfukwa、Paul H. J. Kouwer、Alan E. Rowan、Bert Klumperman
DOI:10.1002/anie.201303135
日期:2013.10.11
biomimetic approach has been used for the templated self‐assembly of a helical poly(para‐aryltriazole) foldamer. The solvophobic folding process yields helices that further self‐assemble into long nanotubes (see picture; scale bar: 100 nm). Constructs of controlled length and chirality can be generated by applying a poly(γ‐benzyl‐l‐glutamate) scaffold at the appropriate assembly conditions, mimicking
Microgel particles for the delivery of bioactive materials
申请人:——
公开号:US20030211158A1
公开(公告)日:2003-11-13
Novel microgels, microparticles and related polymeric materials capable of delivering bioactive materials to cells for use as vaccines or therapeutic agents. The materials are made using a crosslinker molecule that contains a linkage cleavable under mild acidic conditions. The crosslinker molecule is exemplified by a bisacryloyl acetal crosslinker. The new materials have the common characteristic of being able to degrade by acid hydrolysis under conditions commonly found within the endosomal or lysosomal compartments of cells thereby releasing their payload within the cell. The materials can also be used for the delivery of therapeutics to the acidic regions of tumors and sites of inflammation.