Interaction of Transition-Metal-Substituted Heteropolytungstates with Adenosine and Determination of the Site Coordination

Abstract

The complexes of Keggin and Dawson structures of transition-metal-substituted

heteropolytungstates (Cs₅[PW₁₁O₃₉M-OH₂]·xH₂O and

K₈[P₂W₁₇O₆₁M-OH₂]·yH₂O where M is Mn²⁺, Co²⁺, Ni²⁺ and Zn²⁺) with

adenosine have been synthesized and characterized. The UV-visible Fourier

transform IR; ¹H-NMR spectra show an interaction between transition-metal-

substituted heteropolytungstates and adenosine. Our spectroscopic

data show transition-metal-substituted heteropolytungstates coordinated

with adenosine molecule through N(7) of imidazole ring and have a direct

interaction in solid phase. It seems the interaction of Cs₅[PW₁₁O₃₉M-OH₂]·x

H₂O with adenosine is indirect in solution.