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C4H10N2O2, monoclinic, Cc (no. 9), a = 9.5726(8) Å, b = 9.2271(9) Å, c = 7.4577(7) Å, β = 115.295(3)°, V = 595.56(9) Å3, Z = 4, Rgt (F) = 0.0520, wRref (F 2) = 0.1436, T = 298 K .

C18H17NO3S, monoclinic, Cc (no. 9), a = 32.036(3) Å, b = 7.2154(7) Å, c = 7.4283(8) Å, β = 99.943(2)∘, V = 1691.3(3) Å3, Z = 4, Rgt(F) = 0.0343, wRref(F2) = 0.0821, T = 298 K.

C10H5N5O5, monoclinic, P21/c (no. 14), a = 10.9546(11) Å, b = 7.3433(8) Å, c = 13.2567(15) Å, β = 102.972(5)∘ $102.972{(5)}^{\circ }$ , V = 1039.19(19) Å3, Z = 4, Rgt ${R}_{gt}$ (F) = 0.0630, wRref $w{R}_{ref}$ (F 2) = 0.1622, T = 298 K.

C4H10N2O2, monoclinic, Cc (no. 9), a = 9.5726(8) Å, b = 9.2271(9) Å, c = 7.4577(7) Å, β = 115.295(3)°, V = 595.56(9) Å3, Z = 4, Rgt(F) = 0.0520, wRref(F2) = 0.1436, T = 298 K. [ABSTRACT FROM AUTHOR]

C18H17NO3S, monoclinic, Cc (no. 9), a = 32.036(3) Å, b = 7.2154(7) Å, c = 7.4283(8) Å, β = 99.943(2)∘, V = 1691.3(3) Å3, Z = 4, Rgt(F) = 0.0343, wRref(F2) = 0.0821, T = 298 K. [ABSTRACT FROM AUTHOR]

C10H5N5O5, monoclinic, P21/c (no. 14), a = 10.9546(11) Å, b = 7.3433(8) Å, c = 13.2567(15) Å, β = 102.972 (5) ∘ , V = 1039.19(19) Å3, Z = 4, R g t (F) = 0.0630, w R r e f (F2) = 0.1622, T = 298 K. [ABSTRACT FROM AUTHOR]

C10H5N5O5, monoclinic, P21/c (no. 14), a = 10.9546(11) Å, b = 7.3433(8) Å, c = 13.2567(15) Å, β = 102.972 (5) ∘ , V = 1039.19(19) Å3, Z = 4, R g t (F) = 0.0630, w R r e f (F2) = 0.1622, T = 298 K. [ABSTRACT FROM AUTHOR]

In the title compound, [Ni3(PO4)2(H2O)8]n, which was synthesized hydrothermally, all the Ni atoms are located in slightly distorted octahedral coordination environments. Two phosphate groups and two Ni atoms share a centrosymmetric four-membered ring and an eight-membered ring such that the four-membered ring is inside the eight-membered ring. The eight-membered rings are connected with the other Ni atoms (lying on centres of symmetry) through phosphate anions, generating a one-dimensional chain structure. Adjacent chains are connected through hydrogen bonds, forming a three-dimensional network.

C4H10N2O2, monoclinic, Cc (no. 9), a = 9.5726(8) Å, b = 9.2271(9) Å, c = 7.4577(7) Å, β = 115.295(3)°, V = 595.56(9) Å3, Z = 4, Rgt(F) = 0.0520, wRref(F2) = 0.1436, T = 298 K. [ABSTRACT FROM AUTHOR]

In the title mol-ecular salt, C(5)H(9)N(2) (+)·C(7)H(3)N(2)O(7) (-), the roughly planar anion (r.m.s. deviation = 0.120 Å) has been deprotonated at the phenol group. An intra-molecular O-H⋯O hydrogen bond in the anion generates an S(6) ring. In the crystal, the components are linked by cation-to-anion N-H⋯O and N-H⋯(O,O) hydrogen bonds, generating [010] double chains. Weak C-H⋯O inter-actions consolidate the packing.

In the title compound, {(NH(4))(2)[Zn(C(8)H(6)O(8))]·4H(2)O}(n), the asymmetric unit contains one ammonium cation, half of a butane-1,2,3,4-tetra-carboxyl-ate anion, one Zn(2+) cation and two water mol-ecules. The butane-1,2,3,4-tetra-carboxyl-ate ligand is located about an inversion centre at the mid-point of the central C-C bond. The Zn(2+) cation is situated on a twofold rotation axis and is surrounded by four O atoms from four symmetry-related butane-1,2,3,4-tetra-carboxyl-ate anions in a distorted tetra-hedral environment. In turn, each anion coordinates to four Zn(2+) cations. The bridging mode of the anions leads to a three-dimensional framework structure with channels extending along [110] and [010] in which the ammonium cations and the water mol-ecules are located. N-H⋯O and O-H⋯O hydrogen bonding between the cations and water mol-ecules and the uncoordinating O atoms of the carboxyl-ate groups consolidates the crystal packing.

During the recrystallization of 3-[4-(2-carb-oxy-eth-yl)piperazin-1-yl]propionic acid, the carb-oxy-lic acid H atoms were transferred to the piperazine N atoms, forming the title compound, C(10)H(18)N(2)O(4)·2H(2)O, in which the zwitterion lies about an inversion center. In the crystal, bifurcated N-H⋯(O,O) hydrogen bonds connect the zwitterions into a two-dimensional framework parallel to (-102) forming R(4) (4)(30) rings. O-H⋯O hydrogen bonds involving the solvent water mol-ecules connect the two-dimensional framework into a three-dimensional network. In addition, weak C-H⋯O hydrogen bonds are observed.

In the title compound, C(10)H(14)N(4)·0.5H(2)O, the amino H atom of one of the two pyrazole rings is disordered over its two N atoms in a 1:1 ratio. The pyrazole rings are aligned at 60.1 (1)°. In the crystal, two bipyrazolyl mol-ecules are linked by an N-H⋯N hydrogen bond, generating a dimer; the dimer is connected to the water mol-ecule, which lies on a twofold rotation axis, resulting in the formation of a chain that makes an angle of ca 45.3 (1)° with the ab plane. The chains are cross-linked by N-H⋯O and O-H⋯N inter-actions, forming a three-dimensional network.

In the title compound, C(10)H(9)NO(3), the dihedral angle between the phenyl ring and the amide group is 10.8 (2)°. The C=O and O-H bonds of the carboxyl group adopt an anti orientation and an intra-molecular O-H⋯O hydrogen bond closes an S(7) ring. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into C(7) chains propagating in [101]. The packing is consolidated by C-H⋯O inter-actions, generating sheets aligned at an angle of ca 60° with the bc plane.

The two benzene rings in the cation of the title compound, C(15)H(18)N(4)O(2) (2+)·2NO(3) (-)·2H(2)O, are almost perpendicular [dihedral angle = 91.6 (2)°]. In the crystal, the components are linked by O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds.

There are two independent 3,5-dimethyl-pyrazole and two independent 2-hy-droxy-5-(phenyl-diazen-yl)benzoic acid mol-ecules [in which intra-molecular O-H⋯O bonds form S(6) graph-set motifs] in the asymmetric unit of the title compound, C(5)H(8)N(2)·C(13)H(10)N(2)O(3). In the crystal, the components are linked by inter-molecular O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds, forming four-component clusters. Further stabilization is provided by weak C-H⋯π inter-actions.

The centrosymmetric title compound, [Cu(2)(C(10)H(8)N(2))(2)(C(25)H(22)P(2))(2)](BF(4))(2), consists of discrete dinuclear cations and tetra-fluoro-borate anions. The two Cu(I) centers are bridged by the phosphine ligands to form an eight-membered ring. The Cu(I) center exhibits a tetra-hedral coordination as it is chelated by the N-heterocycle.

A correction is made to the name of the first author in Shouwen, Wang, Gao, Wen & Zhou [Acta Cryst. (2008), E64, m259].[This corrects the article DOI: 10.1107/S1600536807067050.].