Open AccessDetermination of Stability Constants of Iron(II) Complexes of as-Triazines Containing Ferroin-Yielding Chromogens
Author(s) -
Md. Anwarul Islam,
Shahida Begum,
Maksuda Parvin,
Md. Musharraf Hossain
Publication year - 2020
Publication title -
the dhaka university journal of science
Language(s) - English
Resource type - Journals
eISSN - 2408-8528
pISSN - 1022-2502
DOI - 10.3329/dujs.v68i2.54611
Subject(s) - chemistry , molar absorptivity , triazine , stability constants of complexes , chromogenic , reagent , bipyridine , inorganic chemistry , nuclear chemistry , organic chemistry , chromatography , crystal structure , physics , aqueous solution , optics
With the aim of determining stability constants of iron(II) complexes of 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine (PDT), 3-(2-pyridyl)-5,6-bis(p-methoxyphenyl)-1,2,4-triazine (PBMPT) and 3-(2-pyridyl)-5,6-bis(4-biphenyl)-1,2,4-triazine (PBBT), these organic reagents were prepared from commercially available relatively cheaper reactants. The absorptiometric characteristics of iron(II) complexes of these organic compounds; λmax and molar absorptivity (€max) were determined. The composition and stability constants of these iron(II) complexes were determined by both molar ratio and Job’s continuous variation methods. The mean logK values for iron(II) complexes of PDT, PBMPT and PBBT were found 16.48, 17.48 and 15.54 respectively reflecting the formation of very stable complexes. These are well comparable with the reported values for the iron(II) complexes of 2,2’-bipyridine, 1,10- phenanthroline, Ferrozine and Ferene. Higher sensitivity and stability constant values reflects the possibility of application of these compounds as promising chromogenic reagents for iron determination.
Dhaka Univ. J. Sci. 68(2): 137-142, 2020 (July)