The heat of complex formation of copper(II) with phytic acid |
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| Affiliation: | 1. Southern Regional Research Center, Agricultural Research Service, USDA, New Orleans, U.S.A.;2. Department of Biological Chemistry and Structure, The Chicago Medical School, University of Health Sciences, Chicago, U.S.A.;1. Laboratoire des Matériaux Catalytiques et Catalyse en Chimie Organique, Faculté de Chimie, USTHB, BP32, El Alia, Bab Ezzouar 16111 Algiers, Algeria;2. Laboratoire de Géophysique, FSTGAT, USTHB, BP 32, El Alia, Bab Ezzouar 16111 Algiers, Algeria;3. Sorbonne Universités, UPMC Univ Paris 6, UMR CNRS 7197, Laboratoire de Réactivité de Surface, F75005 Paris, France;1. Department of Physical Therapy, University of Delaware, Newark, Delaware;2. Delaware Orthopaedic Specialists, Newark, Delaware;3. Center on Aging and Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;4. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;1. Department of Physics, Quaid-E-Millath Government College for Women, Chennai, 600 002, TamilNadu, India;2. Department of Physics, Government Arts College(Men), Nandanam, Chennai, 600 035, TamilNadu, India;3. Department of Physics, Loyola College, Chennai 600 034, TamilNadu, India;4. Department of Physics, Aringnar Anna Government Arts College, Villupuram, 605 602, Tamil Nadu, India;5. Department of Chemistry, Loyola College, Chennai, 600 034, TamilNadu, India;1. University of Silesia, Institute of Chemistry, Szkolna 9, 40-007 Katowice, Poland;2. University of Silesia, Institute of Materials Science, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland;3. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50–422 Wrocław, Poland;1. Department of Chemistry, Govt. Arts College for Women, Salem 636008, India;2. Maisurii Women’s College of Arts and Science, Salem 637504, India |
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| Abstract: | The heats of complex formation of Cu(II) with phytic acid to form soluble complexes in the absence of precipitation at acid pH have been measured. The reaction was examined over a wide range of mol ratios of Cu(II):phytate. In all cases the heats of reaction were endothermic. Measurements of the uncombined copper by use of a copper electrode allowed calculation of the combined copper and hence the enthalpies. These latter values varied to some extent, depending upon the Cu(II):phytate ratio and the pH region where the reaction was examined. Factors which could contribute to the variation in the enthalpy terms include changes in the heats of ionization and possible structural changes with Cu(II) bound. |
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