| abstract |
A chromogenic cryptand found to be especially selective in the determination of lithium in blood of the general formula (I): (I) where: n = 1 or 2, R1 and R2, same or different, are hydrogen, lower alkyl, lower alkenyl, or lower alkylidene; and Q is a chromogenic moiety capable of providing a detectable response upon complexation of said compound with lithium ion and has the structure: wherein: X is CH, C-OH or N; and Z is p-nitrophenylazo, 2,4-dinitrophenylazo, 2,4,6-trinitrophenylazo, p-nitrostyryl, p-benzoquinonemonoimino, bis-(4-dimethylaminophenyl) hydroxymethyl, 3-phenylisothiazolyl-5-azo, thiazolyl-5-azo; or isothiazolyl-5-azo. |