Metal phosphonates based on aminomethylenediphosphonate: Syntheses and characterization of Na4Zn{NH3CH(PO3)2}2·4H2O, Ni{NH3CH(PO3H)2}2·xH2O and NaNi2{NH3CH(PO3)(PO3H0.5)}2(H2O)2·2H2O

✍ Scribed by Song-Song Bao; Tian-Wei Wang; Yi-Zhi Li; Li-Min Zheng

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 407 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2005.10.041

✦ Synopsis

This paper describes the syntheses of three transition metal diphosphonate compounds:

n made up of corner-sharing ZnO 6 octahedra and CPO 3 tetrahedra, which are further connected by tetramers of edge-sharing NaO 6 octahedra, forming a three-dimensional open-framework structure. Compound 2 shows a square-grid layer structure where the NiO 6 octahedra are corner shared with CPO 3 tetrahedra. The adjacent layers are linked by strong interlayer hydrogen bonds, resulting in a three-dimensional open-network structure with channels where the lattice water molecules reside. The structure of compound 3 is analogous to that of NaCo 2 {NH 3 CH(PO 3 )(PO 3 H 0.5 )} 2 (H 2 O) 2 Á xH 2 O in which layers of Ni 2 {NH 3 CH(PO 3 )(PO 3 H 0.5 )} 2 (H 2 O) 2 are connected by NaO 6 linkages into an open-framework structure. The magnetic studies show that weak antiferromagnetic interactions are mediated between the nickel ions in compounds 2 and 3.