Fluorescent dyes useful for detecting a target material in biological assays an electron donating moiety which is linked by a conjugated π-electron bridge to an electron accepting moiety. The π-electron bridge includes at least one carbocyclic ring structure or heterocyclic ring structure. The electron accepting moiety is a carboxylic acid, a salt of a carboxylic acid, or has the formula:
wherein:
X
8
is selected from the group consisting of H, CH
3
, and (CH
2
)
n6
-Z
2
−
, where Z
2
−
is a monovalent anion; and n
6
is an integer from 1 through 10; and
Q
3
is O or S.
A mild and practical copper catalyzed amination of halothiophenes
作者:Zhikuan Lu、Robert J. Twieg
DOI:10.1016/j.tet.2004.11.017
日期:2005.1
We have found that N,N-dimethylethanolamine (deanol) is a useful solvent and ligand for copper catalyzed amination of a variety of unactivated and activated 2- or 3-halothiophenes. Primary amines, acyclic secondary amines, cyclic secondary amines and acyclic secondary amines with 2-hydroxyethyl functionality react with halothiophenes in moderate to excellent yields. The mildly basic conditions utilized are compatible with many functional groups. The animation of halobithiophenes has also been examined. The aminothiophenes produced by this method are important intermediates in a variety of electronic and optoelectronic materials. (C) 2004 Elsevier Ltd. All rights reserved.
US7781187B2
申请人:——
公开号:US7781187B2
公开(公告)日:2010-08-24
Sensitive Structural Control of Macrocycle Threading by a Fluorescent Squaraine Dye Flanked by Polymer Chains
作者:Wenqi Liu、Evan M. Peck、Kevin D. Hendzel、Bradley D. Smith
DOI:10.1021/acs.orglett.5b02633
日期:2015.11.6
A macrocyclic tetralactam is threaded by a complementary squaraine dye that is flanked by two polyethylene glycol chains to produce a pseudorotaxane complex with favorable near-infrared fluorescence properties. The association thermodynamics and kinetics were measured for a homologous series of squaraines with different N-alkyl substituents at both ends of the dye. The results show that subtle changes in substituent steric size have profound effects on threading kinetics without greatly altering the very high association constant.