Synthesis, Characterization of New Tungsten(IV)?Pterin Complexes and their Reactivity Studies towards Trimethylamine N-Oxide, Sodium Borohydride and Potassium Ferricyanide

What is it about?

Pterins (2-amino-4-oxopteridines) are important in a wide range of biological functions including a large number of metal–containing enzymes (e.g., Fe, Mo, W) . The redox noninnocent nature of the pterin ring is associated with the ability of its pyrazine ring to exist in a number of oxidation states . In the above enzymes, this redox capability of the pterin moiety is matched by the ability of the metal centres to display multiple oxidation states . This aspect has catalysed research work on the coordination chemistry of pteridines in general and pterins in particular .

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Why is it important?

like the NAD+/NADH couple where NAD+ can be reduced nonezymatically by the reducing agents like Na2S2O4 or NaBH4. NADH can in turn be nonenzymatically reoxidized with K3[Fe(CN)6], but it is not oxidized directly by molecular O2 .Here we observe that the reaction possibility also follows the principle of single electron transfer. A comparison of the kinetic parameters is quite instructive; the raction with K3[Fe(CN)6] involving an electron transfer process is quite faster as compared to the other two group transfer processes.

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