A series of novel tripyrazolate linked metallomacrocycles and cages possessing different shapes were constructed by dimetal-coordination motifs in aqueous solution.
Minimalist Synthetic Host with Stacked Guanidinium Ions Mimics the Weakened Hydration Shells of Protein–protein Interaction Interfaces
作者:Xing Wang、Joshua Post、Dennis K. Hore、Fraser Hof
DOI:10.1021/jo401949s
日期:2014.1.3
Protein surfaces are complex solutes, and protein-protein interactions are specifically mediated by surface motifs that modulate solvation shells in poorly understood ways. We report herein a supramolecular host that is designed to mimic one of the most important recognition motifs that drives protein-protein interactions, the stacked arginine side chain. We show that it binds its guests and displays good selectivity in the highly competitive medium of pure, buffered water. We use a combination of experimental studies of binding and molecular dynamics simulations to build a cohesive picture of how this biomimetic host achieves the feat. The presence of the stacking element next to the guanidinium groups causes a decrease in the number of host-water hydrogen bonds, a decrease in the density of water around the host, and a decrease in water-water hydrogen bonds near the host. Experimental data using mixed organic/aqueous solvent systems confirm that this host relies on the hydrophobic effect in a way that the two control hosts do not. Our simulations and analysis provide detailed information on the linkage between (de)hydration and binding events in water in a way that could be applied to many aqueous supramolecular systems.
Organic electroluminescent device
申请人:Sano Satoshi
公开号:US20070202358A1
公开(公告)日:2007-08-30
An organic electroluminescent device, which comprises: a pair of electrodes; and an organic compound layer including a light-emitting layer between the pair of electrodes, wherein the organic compound layer comprises a compound represented by formula (I):
wherein Z
1
, Z
2
, Z
3
and Z
4
each independently represents an atom selected from the group consisting of carbon, nitrogen, sulfur and oxygen and necessary for forming an unsaturated 6-membered ring skeleton, the atom may have a hydrogen atom or a substituent; a bond in the unsaturated 6-membered ring indicates a single bond or a double bond; and
R
1
represents a substituent.