Chromogenic hemispherands and their preparation
US5177221A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 8, 1990 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Aug 8, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/3335
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention resides in the discovery of a new class of compounds defined herein as "chromogenic hemispherands" useful for the measurement of ions, in particular, ions in aqueous solution, which have the structure ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl; PA0 R', same or different, is lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl; PA0 R", same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl; PA0 Q is a chromogenic moiety capable of providing the appearance of or change in color, or which is otherwise capable of providing a detectable response in the presence of a particular cation; PA0 m is 1 to about 3; PA0 n is 0 to about 3; PA0 A is an aliphatic or aromatic subunit, e.g., ##STR2##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.