Title of article :
Hydroxy-bisphosphinic acids: synthesis and complexation properties with transition metals and lanthanide ions in aqueous solution
Author/Authors :
Kaboudin, Babak Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Ezzati, Ali Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Faghihi, Mohammad Reza Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Barati, Ali Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Kazemi, Foad Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Abdollahi, Hamid Department of Chemistry - Institute for Advanced Studies in Basic Sciences (IASBS) , Yokomatsu, Tsutomu School of Pharmacy - Tokyo University of Pharmacy and Life Sciences
Abstract :
Treatment of acyl chlorides with a mixture of ammonium hypophosphite and hexamethyl disilazene gave 1-hydroxy-1,1-bisphosphinic acids. Acid dissociation constants (pKa) of 1-hydroxy-1,1-bisphosphinic acids were determined by the pH-potentiometric technique. Complexation properties of 1-hydroxy-1-phenylmethyl-1,1-bis(H-phosphinic acid) (HBPA 1) with Ca2+ as well as transition metals Fe2+, Ni2+, Cu2+, Cr3+ and lanthanide ions La3+, Gd3+ were studied in aqueous solution. The stabilizing ability of complexes of HBPA 1 with these ions in aqueous solutions was determined to show a significant difference in the complex stability due to the transition metals.
Keywords :
Hydroxyphosphinic acids , Dissociation constant , Coordination ability , Transition metals , Lanthanide ions
Journal title :
Astroparticle Physics
