ISSN:
1057-9257
Keywords:
sensor
;
Langmuir-Blodgett film
;
chromoionophore
;
crown ether
;
complex formation
;
stability constant
;
absorbance
;
water
;
metal cation
;
silver
;
mercury
;
lead
;
barium
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Langmuir-Blodgett films built up from an amphiphilic derivative of benzothiazolium styryl dye containing a 1,10-dithia-18-crown-6 ether group have been found to complex with ‘soft’ polarisable ions such as Ag+ and Hg2+ in water. The films exhibited high sensitivity (stability constant of complex formation K ≈ 105 M-1) and high selectivity (e.g. K(Ag+)/K(Pb2+)〉 105) compared with aqueous solutions of similar ionophores. This was attributed to the predominant formation of complexes with ligand-cation stoichiometries of 2:1 in the films.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/amo.860050302
