Fluorogenic and chromogenic three-dimensional ionophores as selective
申请人:Allied-Signal Inc.
公开号:US05162525A1
公开(公告)日:1992-11-10
Novel fluorogenic and chromogenic three-dimensional ionophores are provided which selectively bond ions such as potassium, sodium, and lithium, even in neutral aqueous or alcohol media. The novel ionophores comprse an "ion-recognizing system" fused to a "signal-moiety" through one or more heteroatoms having a non-bonded electron pair. The signal-moieties are selected from the group consisting of fused ring heterocyclics, fused aromatics, and substituted aromatics having at least one nitro or azo moiety. The ion-recognizing system is a three-dimensional cryptand. The ionophores are ideal for the selective and direct termination of ions in biological or environmental samples and the like.
New polyester compositions; shaped articles obtained from them and processes for preparing them
申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0031202A2
公开(公告)日:1981-07-01
UV stable linear polyesters, e.g. polyethylene terephthalate, contain in their chain copolymerised esterification residues of di(hydroxyalkoxy)coumarins. The polyesters are useful for making biaxially oriented films. The polyesters can be made by polycondensation in the presence of 2,4,4'-trihydroxybenzophenone.