ANDERSON-TYPE POMS, SYNTHESIS AND ELECTROCHEMICAL AND PHOTO-CHROMISM PROPERTIES STUDIES

Two compounds of polyoxometalate, (NH₄)₅[IMo₆O₂₄]·3NH₃.5H₂O (1) and (NH₄)₆[TeMo₆O₂₄]·NH₃.5H₂O (2), have been synthesized and characterized by elemental analysis IR and Uv-visible spectroscopy TG analysis and single-crystal X-ray diffraction. The crystal data for these compounds are the following: 1, orthorhombic, Pccn, a=14.2765(4) Ã…, b= 14.9384(3) Ã…, c=14.6053(3) Ã…, α=90°, β = 90°, γ =90°, Z =10 2, orthorhombic, Pccn, a=14.2538(5) Ã…, b= 14.9475(5) Ã…, c=14.6598(5) Ã…, α=90°, β = 90°, γ =90°, Z =10. Compounds 1 and 2 exhibited 2D networks derived from Anderson A-type [XMo₆O₂₄]^5- (X=I (1) or Te (2) ) anions  H₂O and NH_Y^(Y-3)+ (y= 3 or 4). The electrochemical and photochromic properties of these compounds were studied. And it reveals that compound (2) shows excellent redox and photochromic properties. Unlike compound (1) which has good redox properties but weak photochromic properties.