Abstract In the field of organic-inorganic hybrid composites, functionalized polyoxometalates constitute a special class of inorganic nanobuilding blocks (NBBs). This study represents a first approach related to the formation of new oligomeric hybrid species based on the reaction of bis (electrophilic) groups with a divacant heteropolyanion as the NBB. Bis (phosphonates) such as para-H 2 O 3 PCH 2 (C 6 H 4) n CH 2 PO 3 H 2 (n= 1 or 2) have ...