Spectrophotometric determination 3-(2′Thiazolylazo)-2

Spectrophotometric and Polarographic Studies of Di-2-Pyridyl Ketone 2-Thienoylhydrazone

Thu, 2015-05-14 11:04 — Mohammed A. A. Hannoun

Journal Title, Volume, Page:

nalytical Letters Volume: 27 Issue: 10 Pages: 1907-1919 Published: 1994

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/00032719408002640#.VVR2PZP-n_J

Authors:

Ali Z. Abu Zuhri

Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates

Mohamad S. El-Shahawi

Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates

Mostafa M. Kamal

Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates

Mohamad Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohamed Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

The spectral and differential pulse polarographic (DPP) behaviour of di-2-pyridyl ketone 2-thienoylhydrazone (DPKTH) has been investigated in 30% (v/v) ethanol-buffer mixtures over a wide range of pH (2.0-12.0). The spectral bands located at 325, 276. 230 and 208 nm of the DPKTH in ethanol are assigned to the possible electronic transitions of the molecule. The spectral data at various pH values indicates that the molecule characterized by the keto = enol tautomerization and the pK(a) value for the enolic form of the compound is determined in aqueous ethanol and was found to be 10.6. The effect of various operational parameters on the reduction current and the mechanism of the electrode reaction of DPKTH at the DME are discussed. The main reduction peaks are attributed to the reduction of C=N centre of both the keto and enol forms. This behaviour is compared with the DPP behaviour of the other related acid hydrazone compounds. The applicability of DPP technique for the trace determination of DPKTH was tested under the optimum experimental conditions and the detection limit is found to be 0.09 mu m.

Spectrophotometric Determination of Trace Amounts of Cobalt and Copper with 3- (2'-Thiazolylazo)- 2,6- Diaminopyridine

Thu, 2015-05-14 10:54 — Mohammed A. A. Hannoun

Journal Title, Volume, Page:

Spectroscopy Letters, Volume 25, Issue 7 November 1992 , pages 1049 - 1055

Year of Publication:

1992

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019208018214

Authors:

Basem F. Shraideh

Ali. Z. Abu Zuhri

Mohammad Hannoun

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

Sensitive methods for the determination of trace amounts of cobalt and copper by complexation with 3-(2'-Thiazolylazo)-2,6- diaminopyridine (2,6-TADAP) are described. Copper forms a 1:2 violet complex with the reagent having a molar absorptivity of 1.00 times 104 L mol-1cm-1, Baer's law is obeyed over the range 0 -50.84 μg in the total volume of 10ml. Cobalt also forms a 1:1 green complex with a molar absorptivity of 1.07 times 104L mol-1cm-1 and obeying Beer's law over the range 0 -23.57 μg in the total volume of 10 ml. The procedure is simple and rapid without any tedious extraction steps for copper and without oxidation of cobalt (II) to cobalt (III).

An-Najah Staff