“Wurster-Type” Ureas as Redox-Active Receptors for Anions
作者:John P. Clare、Anna Statnikov、Vincent Lynch、Andrew L. Sargent、John W. Sibert
DOI:10.1021/jo9011392
日期:2009.9.4
Four redox-active receptors, 1-4, based on the incorporation of p-phenylenediamine(s) within a urea framework, were synthesized, and the affinities of two for a series of anions were quantified through UV-vis and NMR spectroscopic studies. The structure of 1 was confirmed by X-ray crystallography. For the oxoanions studied, complex stabilities approached 10(6) M-1 in acetonitrile and decreased with the decreasing basicity of the anion (CH3COO- > C6H5COO- > H2PO4- > NO2- > NO3-). The presence of the urea functionality caused an increase in the oxidation potential of the p-phenylenediamine subunit compared to that of free p-phenylenediamine. Electrochemical studies of the anion complexes revealed two-wave behavior with the appearance of a second oxidation wave cathodic to that in the free receptors and characteristic of the bound anion, Ab initio DFT studies of a representative acetate complex revealed the consequences of host oxidation state on complex structure.
NOVEL COMPOUNDS
申请人:New Pharma Research Sweden AB
公开号:EP1224165A1
公开(公告)日:2002-07-24
US6875764B1
申请人:——
公开号:US6875764B1
公开(公告)日:2005-04-05
[EN] NOVEL COMPOUNDS<br/>[FR] NOUVEAUX COMPOSES
申请人:NEW PHARMA RES SWEDEN AB
公开号:WO2001030749A1
公开(公告)日:2001-05-03
The present invention relates to novel compounds, pharmaceutical compositions containing the same as well as a method for treatment of parasitic disorders, wherein said compounds are administered. The present compounds are especially well suited for treatment of coccidiosis, particularly in poultry, and they have general formula (I), where Y is S or O and R is as defined in the specification.
Urea-based constructs readily amplify and attenuate nonlinear optical activity in response to H-bonding and anion recognition
Urea-based molecular constructs are shown for the first time to be nonlinear optically (NLO) active in solution. We demonstrate self-assembly triggered large amplification and specific anion recognition driven attenuation of the NLO activity. This orthogonal modulation along with an excellent nonlinearity-transparency trade-off makes them attractive NLO probes for studies related to weak self-assembly and anion transportation by second harmonic microscopy.