91540-13-5

Upstream product

• 91540-12-4 7,16-di<2-(p-tolylamino)phenyl>-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane 
• 31255-10-4 1,2-bis-(2-bromo-ethoxy)-ethane 
• 3624-90-6 N-tosyl-1,2-diaminobenzene 
• 91540-10-2 9,18-di<2-(p-tolylamino)phenyl>-1,8-dioxo-3,6,12,15-tetraoxa-9,18-diazacycloocta-decane 
• 91755-59-8 1,2-di<2-<2-(p-tolylamino)anilino>ethoxy>ethane 
• 31255-09-1 3,6-dioxa-1,8-octanoyl dichloride 
• 91540-08-8 triglycolic acid di-(2-p-tolylamino)anilide 
• 23978-55-4 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane 
• 1493-27-2 ortho-nitrofluorobenzene 

Downstream Products

• 91540-14-6 7,16-di<2-(3-carboxypropionylamino)>phenyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane 

Relevant academic research and scientific papers

Water soluble diaza crown ether derivative: Synthesis and barium complexation studies

The combination of a mcrocyclic cavity with o-diaminobenzene derivative offers a new redox-active and water-soluble ligand for barium that incorporates 12 potential donors. The chelator was synthesized in four steps from diaza-18-crown-6-ether and fully characterized in solution by cyclic voltammetry, UV-Visible and NMR spectroscopies in the presence of barium. The corresponding complex exhibits a 1:1 stoichiometry in solution whereas it crystallizes as 3:2 (M:L) as evidenced by X-ray diffraction studies. The high affinity constant for barium estimated by NMR and electronic absorption techniques in aqueous medium, makes this ligand a promising candidate for redox-induced barium release.

THE INFLUENCE OF SIDE-CHAINS ON THE COMPLEXATION OF CATIONS BY CROWNS. SYNTHESIS AND Cu(II) COMPLEXATION OF N,N'-DIARYL-DIAZA-18-CROWN-6

Various N,N'-diaryl derivatives of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane were synthesized. 7,16-diphenyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane had only a low affinity for cations.On the contrary, diamide derivatives of 7,16-di-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane were deprotonated by Cu(II) and formed stable chelates.Spectral data suggest that monodeprotonation gives dissymmetric 1:1-complexes and dideprotonation gives symmetric 1:1-complexes.