SEARCH Articles Figures Tables 1 -Hydroxyethane-1,1 -diphosphonic acid 1 -Hydroxyethylidene-1,1 -diphosphonic acid 1-Hydroxyethane-l,1-diphosphonic acid Dichloromethylene diphosphonate Diphosphonate Diphosphonate complexes Diphosphonate ligands bridging Diphosphonate radiopharmaceuticals Diphosphonates, methylidenesynthesis Knoevenagel reaction Diphosphonic acid Diphosphonic acid esters Ethane-1,1-diphosphonic acid Ethane-1-hydroxy-1,1-diphosphonate Hydroxyethylidene)diphosphonate (HEDP) Hydroyethylidene diphosphonate Hydroyethylidene diphosphonate HEDP) Ligands diphosphonate Methylene diphosphonate Propane-1,2-diphosphonic acid Zirconium diphosphonate multilayer Zirconium diphosphonate multilayer films