Synthesis and spectroscopic characterization of two new Dawson sandwich complexes: Na(NaOH)VO)P.40H and Na(NaOH)VO)As.27H

Reaction of the three vacant complex of a-[p 12- and a-[as 12- with divalent cation of vo 2+ in 1:1 mole ratio yields a previously unknown sandwich-type wells-dawson complex; na(naoh)vo)p.40h (represented as navo) and na(naoh)vo)as.27h (represented as navo)s. these complexes contain anions in which two divalent vo 2+ cations with two na + ions are symmetrically sandwiched between two α-[p12- or α-[as 12- groups leading to a lacunary sandwich complex. the anion complexes are isolated as sodium salts and characterized by elemental analysis,tga,ir,31p nmr and uv-vis spectroscopy. © 2012 hindawi publishing corporation.