Some bidentate amine adducts of indium(III) organophosphonates

A series of indium(III) organophosphonates with coordinated 2,2'-bipyridyl and 1,10-phenanthroline ligands have been prepared and characterised. The b ipyridyl and phenanthroline derivatives of indium(III) phenyl- and benzyl-p hosphonates have a 1 : 2 : 1 molar ratio of metal:phosphorus:amine ligand, with proposed formulations In(O3PR)(O2P(OH)R)(C10H8N2).H2O and In(O3PR)(O2P (OH)R)(C12H8N2).H2O respectively (where R = C6H5 and CH2C6H5). Like the par ent compounds, these adducts contain the organophosphonate ligand in both f ully and partially deprotonated forms. In contrast, the bipyridyl and phena nthroline indium(III) methylphosphonates contain a 1 : 1 : 1 molar ratio of indium:phosphorus:amine, with proposed formulations In(OH)(O3PCH3)(C10H8N2 ) and In(OH)(O3PCH3)(C12H8N2). 2H(2)O respectively. Powder XRD measurements indicate that the bipyridyl phenylphosphonate and methylphosphonate compou nds are layered, with interlayer spacing for the former (11.34 Angstrom) re duced, and for the latter slightly increased (8.83 Angstrom), relative to t he parent indium(III) phenylphosphonate and methylphosphonate, respectively . The corresponding phenanthroline adducts of indium(III) phenylphosphonate and methylphosphonate do not possess layered structures. Both the bipyridy l and phenanthroline indium(III) benzylphosphonates are amorphous solids. F TIR, powder XRD, TGA and solid state P-31/C-13 MAS NMR data are presented.