The role of deprotonation of the ligand on the structures of metal phosphonates: synthesis, characterization and crystal structures of two new metal diphosphonates with a 1D double chain and a 2D layer structure

Structural homologies in benzylamino-N,N-bis methylphosphonic acid and its layered zirconium derivative

“…The N(12)?O(9)#5 distance (#5=1.5Àx, 0.5+y, z) is only 2.48(1) Å (see Fig. 5), indicating that a strong hydrogen bond is present between them, or more probable, that the amino group is protonated by the phosphonate, as found in the pure diphosphonic acid structure, and in other similar systems [9,12,15]. This hypothesis is in agreement with IR spectrum of 2, that shows a broad band in the region 2600-2200 cm À1 that may be due to R 3 N-H + stretching vibration.…”

“…Additional lateral interactions between molecules within the same molecular layers have been found. As usual for this kind of compounds [9,12,[15][16][17], a hydrogen bond is present between N(7) and P-O(8) #2 (#2=x, y+1, z). Furthermore, benzyl tails of adjacent molecular layers are interdigitated in a herringbone close packed arrangement, and define a non-polar layered region.…”

“…However, many other original zirconium phosphonate structures have recently been reported, and it would be seen that research in this field is far from being exhausted [3,5,6]. R-amino-N,N-bis methylphosphonates (R=organic group) are versatile building blocks that have been used for the preparation of several metal(II) derivatives [7][8][9][10][11][12][13][14][15]. We recently reported the preparation and structural characterization of a series of new layered zirconium diphosphonates, in which R was an alkyl chain of various lengths, or a butanoic group [16,17].…”

Hydrothermal synthesis and crystal structures of Mn(II) and Cd(II) aminophosphonates with a layered structure

“…For construction of inorganicÀorganic hybrid compounds, substituted aminodiphosphonic acids, RN(CH 2 PO 3 H 2 ) 2 are very useful ligands [10][11][12][13]. For instance, Cd(H 3 L) 2 (H 4 L ¼ C 6 H 5 CH 2 N(CH 2 PO 3 H 2 ) 2 ) features double chains that are further interlinked by hydrogen bonds [10].…”

Synthesis, crystal structure and characterizations of a new 3D porous zinc phosphonate: Zn6[(O3PCH2)2NHC6H11]4·6H2O

“…In the point of view of structural construction of inorganic-organic hybrid compounds, the substituted aminodiphosphonic acid, RN(CH 2 PO 3 H 2 ) 2 , is very useful ligands in the synthesis of metal phosphonates with new structure types [10][11][12][13][14]. Recently, a layered Zn(II) complex with C 6 H 11 N(CH 2 -PO 3 H 2 ) 2 (H 4 L) has been reported by Ying and Mao [15].…”