{P 2 V 3 W 15 }-Polyoxometalates Functionalized with Phthalocyaninato Y and Yb Moieties

A tris(alkoxo)pyridine-augmented Wells-Dawson polyoxometalate ( Bu N) [ ] (WD = P V W O (OCH ) C, Py = C H N) was functionalized with phthalocyaninato metal moieties ( where M = Y or Yb and Pc = C H N ) to afford ( Bu N) [H ( )] compounds. High-resolution mass spectrometry was used to detect and identify the hybrid assembly. The magnetism studies reveal substantial differences between M = Yb (monomeric, single-ion paramagnetism) and M = Y (containing dimers, radical character). The results of electronic paramagnetic resonance spectroscopy, SQUID magnetometry, and magnetochemical calculations indicate the presence of molecular charge transfer from the moiety to the polyoxometalate and of molecular charge transfer from the moiety of one molecule to the polyoxometalate unit of another molecule. These compounds with identified V ions represent unique examples of transition-metal/lanthanide complex-POM hybrid compounds with nonphotoinduced charge transfer between electron donor and acceptor centers.