Spectrophotometric determination of cobalt with dipyridylglyoxal mono(2-pyridyl)hydrazone |
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| Institution: | 1. Research and Development Centre, Bharathiar University, Coimbatore, India;2. JCT College of Engineering and Technology, Pichanur, Coimbatore, India;3. Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA;4. Department of Applied Chemistry, Karunya Institute of Technology and Sciences, Karunya Nagar, Coimbatore, India;5. Department of Chemistry, Sri Krishna College of Engineering and Technology, Coimbatore, India;1. Department of Chemistry, College of Science, University of Tabuk, Tabuk, Saudi Arabia;2. Department of Chemistry, Faculty of Applied Science, Umm-Al-Qura University, Makkah, Saudi Arabia;3. Department of Biology, Jamoum University College, Umm Al-Qura University, Makkah, Saudi Arabia;4. Department of Chemistry, Faculty of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia;5. Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;6. Department of Chemistry, Faculty of Science, Mansoura University, El-Gomhoria Street, Egypt;1. Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile;2. Neural Injury Group, Nuffield Department of Clinical Neuroscience, John Radcliffe Hospital, University of Oxford, Oxford, UK;3. Chronic Pain Research Group, Division of Population Health and Genomics, Mackenzie Building, Ninewells Hospital & Medical School, University of Dundee, Dundee, UK;4. The Jackson Laboratory, Bar Harbor, ME, USA;5. Department of Clinical Medicine, Danish Pain Research Center, Aarhus University, Aarhus 8000, Denmark;6. Department of Anesthesiology, Perioperative Medicine and Pain Management, and John T. MacDonald Foundation Department of Human Genetics, Miller School of Medicine, University of Miami, Miami, FL, USA;7. Dr. John and Anne Chong Lab for Functional Genomics, Camperdown, University of Sydney, Sydney, NSW, Australia;8. Departments of Anesthesia and Neurobiology, Children’s Hospital Boston and Harvard Medical School, Boston, MA, USA |
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| Abstract: | A method for the Spectrophotometric determination of cobalt with dipyridylglyoxal mono(2-pyridyl)hydrazone (DMPH) has been devised. The orange-reddish Co-DMPH chelate (ϵ = 2.7 × 104 liters mol−1 cm−1 at 490 nm) is formed at pH 3–7 in a solution containing 24% (v/v) ethanol. This complex, on addition of a strong acid, shows a bathochromic shift from 490 to 505 nm. A fair degree of selectivity for cobalt is achieved by measuring the absorbance of the orange-reddish coloration at 510 nm (isosbestic point wavelength; ϵ = 2.6 × 104 liters mol−1 cm−1) in solutions of final acidity about 1 M in perchloric acid. |
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