Ammonium dihydrogen (1-ammonio­pentane-1,1-di­yl)diphospho­nate

The title compound, NH4 +·C5H14NO6P2 −, was obtained from 1-ammonio-1-phosphono­pentane-1-phospho­nic acid and ammonium hydroxide in aqueous solution. The asymmetric unit of title compound contains one molecule, which consists of an ammonium cation and an aminodiphosphonic anion with the H atoms transferred from the phosphonic acid group to the amino group. The crystal structure shows a three-dimensional network of O—H⋯O and N—H⋯O hydrogen bonds which stabilize the structure

Diaqua­bis­(dihydrogen 3-aza­niumyl-1-hy­droxy­propyl­idene-1,1-di­phos­phon­ato-κ2 O,O′)cobalt(II)

The asymmetric unit of title compound, [Co(C3H10NO7P2)2(H2O)2], contains one half-mol­ecule of the complex. The CoII atom is located on an inversion centre and displays a distorted octa­hedral coordination geometry defined by four O atoms of two 3-aza­niumyl-1-hy­droxy­propyl­idene-1,1-bis­phospho­nato ligands in the equatorial plane and two water mol­ecules located in axial positions. The ligand mol­ecules, which exist in a zwitterionic state, form two six-membered chelate rings with chair conformations. In the crystal, mol­ecules are inter­linked by O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional supra­molecular structure

{[1-(2-Amino­ethyl­amino)-1-methyl­ethyl]phospho­nato-κ3 N,N′,O}chloridopalladium(II) monohydrate

In the title compound, [Pd(C5H14N2O3P)Cl]·H2O, the Pd(II) atom shows a slightly distorted square-planar geometry and forms two five-membered metallacycles, which both exhibit half-chair conformations. The crystal structure consists of layers propogating in the [100] direction which are connected into a three-dimensional network by strong N—H⋯Cl, N—H⋯O and O—H⋯O hydrogen bonds

Oxonium (dihydrogen 1-amino­ethane-1,1-diyldiphospho­nato-κ2 N,O)[hydrogen (1-amino-1-phosphono­ethyl)phospho­nato-κ2 N,O]palladium(II) trihydrate

The title compound, (H3O)[Pd(C2H7NO6P2)(C2H8NO6P2)]·3H2O, was synthesized by the reaction of [Pd(H2O)4](NO3)2 with 1-amino­ethane-1,1-diyldiphospho­nic acid in aqueous solution. The asymmetric unit contains one mol­ecule of the complex existing as an anion, an oxonium counter-ion and three solvent water mol­ecules. The PdII ion occupies a position on a pseudo-twofold axis, which is not realized crystallographically. The slightly distorted square-planar coordination environment of the PdII ion consists of the O atoms from two phospho­nic acid groups and two N atoms of the amino groups in cis positions. The crystal structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a wide three-dimensional network

1-Ammonio-1-phosphono­pentane-1-phospho­nic acid

The title compound, C5H15NO6P2, was obtained by the reaction of penta­nenitrile with PCl3 followed by the dropwise addition of water. The asymmetric unit contains one mol­ecule, which exists as a zwitterion with a positive charge on the –NH3 group and a negative charge on one of the phospho­nic O atoms. The crystal structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a three-dimensional network

Oxonium ammonio­(cyclo­prop­yl)methyl­enebis(hydrogenphospho­nate) monohydrate

The title compound, H3O+·C4H10NO6P2 −·H2O, was obtained from the reaction of cyclo­propane­carbonitrile with PCl3, followed by dropwise addition of water. The asymmetric unit comprises an oxonium cation, a zwitterionic monoanion containing a positively charged ammonium group and two negatively charged phospho­nic acid residues and a water mol­ecule of crystallization. The hydroxonium cation and water mol­ecule are hydrogen bonded to the anion and further N—H⋯O and O—H⋯O bonds create a three-dimensional network

Ammonium 1-ammonio­ethane-1,1-diylbis(hydrogenphospho­nate) dihydrate

The title compound, NH4 +·C2H8NO6P2 −·2H2O, was obtained by the reaction between 1-amino­ethane-1,1-diyldiphospho­nic acid and ammonium hydroxide (1:1) in an aqueous solution. The asymmetric unit contains one anion with two H atoms transferred from the phospho­nic acid groups to the amino group of the anion and to an ammonia mol­ecule, giving an ammonium cation. The structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a three-dimensional network

Ammonium hydrogen (RS)-[(5-methyl-2-oxo-1,3-oxazolidin-3-yl)meth­yl]phospho­nate

In the title compound, NH4 +·C5H9NO5P−, the five-membered methyl­oxazolidin-2-one unit is disordered over two positions, the major component having a site occupancy of 0.832 (9). A three-dimensional network of O—H⋯O and N—H⋯O hydrogen bonds stabilizes the crystal structure

Bis[(1-ammonio­ethane-1,1-di­yl)diphospho­nato-κ2 O,O′]diaqua­nickel(II) nona­hydrate

The title compound, [Ni(C2H8NO6P2)2(H2O)2]·9H2O, exhibits a slightly distorted octa­hedral coordination environment around the NiII atom. It contains two mol­ecules of 1-amino­­ethyl­idenediphospho­nic acid in the zwitterionic form, coord­inated via O atoms from two phospho­nate groups and creating two six-membered chelate rings. Two water mol­ecules in cis positions complete the coordination environment of the NiII atom. The title compound contains nine partly disordered solvent water mol­ecules, which create a three-dimensional network of strong O—H⋯O and N—H⋯O hydrogen bonds

Poly[[μ-(1-ammonio­ethane-1,1-di­yl)bis­(hydrogenphospho­nato)]diaquachloridodisodium]: a powder X-ray diffraction study

The title compound, [Na2(C2H8NO6P2)Cl(H2O)2]n, has a polymeric two-dimensional structure extending parallel to (001). The asymmetric unit contains two Na+ cations located on a centre of symmetry and on a mirror plane, respectively, one half of a bis-phospho­nate anion (the entire anion is completed by mirror symmetry), one chloride anion on a mirror plane and one water mol­ecule in general positions. The two Na+ cations exhibit distorted octa­hedral NaCl2O4 coordination polyhedra, each consisting of two deprotonated O atoms of the bis-phospho­nate anion, of two water mol­ecules and of two chloride anions. Strong O—H⋯O hydrogen bonds between the –OH group and one of the free O atoms of the bis-phospho­nate anion connect adjacent layers along [100], supported by N—H⋯Cl inter­actions. Intra­layer O—H⋯O and N—H⋯O hydrogen bonds are also observed