58441-02-4

Upstream product

• 917-23-7 5,10,15,20-tetraphenyl-21H,23H-porphine 
• 13283-01-7 tungsten(VI) chloride 
• 108-95-2 phenol 
• 96390-62-4 W(O)(OC₆H₅)(C₂₀H₈N₄(C₆H₅)4) 

Relevant academic research and scientific papers

Hydroxyoxo(5,10,15,20-tetraphenylporphinato)tungsten(V) as a receptor for foodstuff and drug components. Thermodynamics of supramolecular complexation

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 Kn were determined to be 2.55 × 104, 1.87 × 103 L/mol, 1.06 × 106, 4.09 × 104 L2/mol 2. 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. Pleiades Publishing, Ltd., 2010.

Coordination of pyridine with oxy(hydroxy)tungsten tetraphenylporphine

A stable tungsten complex with the composition O=W(OH)TPP has been obtained by the interaction of meso-tetraphenylporphine (H2TPP) with tungsten hexachloride in boiling phenol. The thermodynamics and kinetics of the O=W(OH)TPP reaction with pyridine in toluene has been investigated by spectropholometry. It has been found that the reaction is a complex process including three elementary stages: the coordination of the Py molecule to the W atom with increasing its coordination number (Z) to 8 (K1 = 1.33 × 104 l/mol, k1 = 1.81 mol/(l s)); the coordination of the second Py molecule with the displacement of the OH group into the second coordination sphere (K2 = 8.42 × 103 l/mol, k 2 = 1.32 mol/(l s)); and the coordination of the third Py molecule due to breaking of the M=O double bond and protonation at the oxygen atom (K3 = 89 l/mol, k3 = 4.44 × 10-2 mol/(l s)). The nature and sequence of the elementary reactions have been explained by the high bond strength of the O2- ligand with the W atom. A comparative analysis of the coordination properties of O=W(OH)TPP and the related complexes of other metals has been carried out.