Patent ID: 8273576
Filing Date: 2012-09-25
Classification: C07D,C07F,G01N

Abstract:
1. A method for selective detection and quantification of Cr 6+ in a liquid sample, comprising: (i) exposing a divalent osmium (Os (ii) recording absorption spectra of said pyridyl complex at the UV/visible spectral range, and (iii) monitoring the presence of Cr wherein said pyridyl complex is a charged tris-bipyridyl Os wherein M is Os, Fe or Ru; n is the formal oxidation state of the osmium, iron or ruthenium, wherein n is 2 or 3; m is the positive charge of the tris-bipyridyl ligand, wherein m is an integer from 0 to 24, X is a counter anion selected from Br R wherein at least one of said R wherein group A is wherein group A is linked to the ring structure of the compound of general formula I via R 4 ; R R R R group B is −O(CH R any two vicinal R 5 -R 28 substituents, together with the carbon atoms to which they are attached, may form a fused ring system selected from cycloalkyl, heterocycloalkyl, heteroaryl or aryl, wherein said fused system may be substituted by one or more groups selected from C 1 -C 10 alkyl, aryl, azido, cycloalkyl, halogen, heterocycloalkyl, alkoxy, hydroxyl, haloalkyl, heteroaryl, alkenyl, alkynyl, nitro, cyano, amino, substituted amino, carboxamido, substituted carboxamido, carboxyl, protected carboxyl, protected amino, thiol, sulfonyl or substituted aryl; and said fused ring system may also contain at least one heteroatom selected from the group consisting of N, O and S.