Analytical Aspects of Reactions of 2-(2-Pyridyl)-benzimidazole and 2-(2-Pyridyl)-imidazoline with Iron(II)

Journal Article · Fri Jan 01 00:00:00 EST 1954 · Analytical Chemistry

DOI:https://doi.org/10.1021/ac60085a039· OSTI ID:4412165

Walter, Joseph L. ^[1]; Freiser, Henry ^[1]

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1. Univ. of Pittsburgh, PA (United States)

The compounds, 2(2-pyridyl)-benzimidazole and2(2-pyridyl)-imidazoline, of interest because of their structural similarity to 2,2',-bipyridine and o-phenanthroline, were prepared and their reactions with metal cations tested. Both were found to give color reactions with copper(I), copper(II), cobalt(II), iron(ll), and iron(III). Most notable were those with iron(II), with which deep red-purple colored complexes were formed. These complexes were studied spectrophotometrically and found to have maximum absorbances at 490 mμ for 2-(2-pyridyl)-benzimidazole at pH 5.7 and 560 mμ for 2-(2-pyridyI)-imidazoline at pH 9.0. The molar extinction coefficients for the 2-(2-pyridyl)-benzimidazoIe and 2-(2-pyridyl)-imidazoline are 3800, and 7800, respectively. Finally, the iron complexes could also be extracted with isoamyl alcohol, thus increasing the sensitivity of the color reaction.

• Research Organization: Univ. of Pittsburgh, PA (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-07-005023
• OSTI ID: 4412165
• Report Number(s): NYO--3771
• Journal Information: Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 1 Vol. 26; ISSN 0003-2700
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

ACIDITY
ALCOHOLS
CHEMICAL REACTIONS
CHEMICALS
CHEMISTRY
COBALT COMPLEXES
COLOR
COPPER COMPLEXES
IMIDAZOLES
IRON
IRON COMPLEXES
MERCURY COMPLEXES
ORGANIC NITROGEN COMPOUNDS
PHOTOMETRY
PYRIDYL RADICALS
QUALITATIVE ANALYSIS
SENSITIVITY
SOLVENT EXTRACTION
SPECTROSCOPY
STABILITY