Hydroxyoxo(5,10,15,20-tetraphenylporphinato)tungsten(V) as a receptor for foodstuff and drug components. Thermodynamics of supramolecular complexation |
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Authors: | E V Motorina T N Lomova |
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Institution: | (1) Max Planck Institute of Colloids and Interfaces Colloid Department, Research Campus Golm, Potsdam, 14424, Germany; |
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Abstract: | The thermodynamics of stepwise reactions of hydroxyoxo(5,10,15,20-tetraphenylporphinato)tungsten(V) (O=W(OH)TPP) with biologically
active base molecules was studied. For the reaction of O=W(OH)TPP with benzimidazole, four steps were found and studied; the
equilibrium constants K
n
were determined to be 2.55 × 104, 1.87 × 103 L/mol, 1.06 × 106, 4.09 × 104 L2/mol2. The reaction of O=W(OH)TPP with pyrazine was a one-step reversible process of Pyz coordination to the eighth coordination
site (K = 399 L/mol). The correlation equations relating the stability of supramolecular complexes to pK of the bases were obtained. The thermodynamic data were used to demonstrate the prospects of applying the metal porphyrin
as a receptor for N-bases in membranes, sensors, and analytical devices for quality control of foodstuffs, drugs, and gas
mixtures for the content of VOCs. |
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Keywords: | |
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