A new layered zirconium biphosphonate framework covalently pillared with N,N′-piperazinebis(methylene) moiety: synthesis and characterization

A new hybrid organic–inorganic material denoted by ZrPMP·1.7H2O, where PMP = N,N′-piperazinebis(methylenephosphonic acid), is prepared through the decomposition of zirconium fluoro-complex in the presence of PMP. This material is characterized by X-ray diffractometry, solid 31P NMR and FT-IR spectrophotometries and thermal analyses. All of the above mentioned analyses provide strong evidence that this material is structurally related to α-type layered zirconium phosphate.