Small Multivalent Architectures Mimicking Homotrimers of the TNF Superfamily Member CD40L: Delineating the Relationship between Structure and Effector Function
Synthetic multivalent ligands, owing to the presence of multiple copies of a recognition motif attached to a central scaffold, can mediate clustering of cell surface receptors and thereby function as effectormolecules. This paper dissects the relationship between structure and effector function of synthetic multivalent ligands targeting CD40, a cell surface receptor of the tumor necrosis factor receptor
A Cyanuric Acid Platform Based Tripodal Bis-heteroleptic Ru(II) Complex of Click Generated Ligand for Selective Sensing of Phosphates via C–H···Anion Interaction
lifetime of ∼5 ns in acetonitrile. It shows selective sensing of hydrogen pyrophosphate (HP2O73–) through 20-fold enhanced emission intensity (ϕf = 0.039) with a 15 nm red shift in emission maxima even in the presence of a large excess of various competitive anions like F–, Cl–, AcO–, BzO–, NO3–, HCO3–, HSO4–, HO–, and H2PO4– in acetonitrile. Selective change in the decay profile as well as in the lifetime
The present invention provides a compound of the formula
wherein R
1
is an ammonium bridge. The compounds of the present invention can be linked to a biological molecule that targets a specific type of cell. The compounds of the present invention can trap isotopic fluorine so that when the biological molecule accumulates in the desired type of cell, the isotopic fluorine is imaged by positron emission tomography (PET).
Unusual recognition of (n-Bu4N)2SO4 by a cyanuric acid based host via contact ion-pair interactions
作者:I. Ravikumar、Pradyut Ghosh
DOI:10.1039/c0cc02509g
日期:——
A tripodal neutral receptor selectively binds tetrabutylammonium sulfate where anion is encapsulated in the cavity and cations are in close contact with the anion via C–H⋯O interactions. This organic cation capped sulfate-bowl exists both in solid and solution states and the sulfate assisted cap can be opened and closed reversibly with a temperature key.
Multi-step regulation of anion recognition by redox-active pseudocryptand
作者:Tatsuya Nabeshima、Sayuri Masubuchi、Norie Taguchi、Shigehisa Akine、Toshiyuki Saiki、Soichi Sato
DOI:10.1016/j.tetlet.2006.12.143
日期:2007.2
We synthesized an artificial redox-active Fe-pseudocryptand as an anion receptor to respond to electrochemical oxidation and reduction. Spectroscopic study and X-ray crystallography showed that the assembled urea chains and the isocyanuric platform generate an anion-binding cavity through favorable multiple hydrogen bonds and anion-pi interactions. As the positive charge of the Fe center increases, the anion affinity is effectively increased due to an enhanced electrostatic interaction between the Fe atom and the anionic guest. This is the first efficient multi-step regulation of Cl- selective anion recognition by the redox-active pseudocryptand. (c) 2007 Elsevier Ltd. All rights reserved.