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1.  2-Ethyl­piperidinium chloride 
In the title molecular salt, C7H16N+·Cl−, the piperidinium ring adopts a chair conformation. In the crystal, the two components are connected by N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming a supra­molecular double-chain structure along the c axis.
doi:10.1107/S1600536811036804
PMCID: PMC3201318  PMID: 22058776
2.  2-Amino-4,6-dimethyl­pyridinium chloride dihydrate 
In the title hydrated mol­ecular salt, C7H11N2 +·Cl−·2H2O, the pyridine N atom of the 2-amino-4,6-dimethyl­pyridine mol­ecule is protonated. The cation is essentially planar, with a maximum deviation of 0.006 (2) Å. In the crystal, the components are linked by N—H⋯O, N—H⋯Cl and O—H⋯Cl hydrogen bonds, thereby forming sheets lying parallel to (100). The crystal structure is further stabilized by aromatic π–π stacking inter­actions between the pyridinium rings [centroid–centroid distance = 3.4789 (9) Å].
doi:10.1107/S1600536811035100
PMCID: PMC3201217  PMID: 22058738
3.  (2,6-Difluoro­phen­yl)(4-methyl­piperidin-1-yl)methanone 
In the title compound, C13H15F2NO, the piperidine ring adopts a chair conformation. The dihedral angle between the least-squares plane of the piperidine ring and the benzene ring is 48.75 (7)°. In the crystal structure, the mol­ecules are connected via C—H⋯O hydrogen bonds, forming a zigzag chain along the b axis.
doi:10.1107/S1600536811033848
PMCID: PMC3200831  PMID: 22065411
4.  Naphthalen-1-aminium chloride 
In the crystal structure of the title compound, C10H10N+·Cl−, the two components are connected via N—H⋯Cl hydrogen bonds, forming a layer parallel to the bc plane.
doi:10.1107/S1600536811032569
PMCID: PMC3200768  PMID: 22058972
5.  N,N′-(Ethane-1,2-di­yl)bis­(4-chloro­benzene­sulfonamide) 
The title mol­ecule, C14H14Cl2N2O4S2, lies on an inversion center. The mol­ecule is twisted in the region of the sulfonamide group with a C—S—N—C torsion angle of −67.49 (16)°. In the crystal, mol­ecules are connected via inter­molecular N—H⋯O and weak C—H⋯O hydrogen bonds, forming layers parallel to (100).
doi:10.1107/S1600536811028443
PMCID: PMC3200590  PMID: 22058909
6.  N,N′-(Ethane-1,2-di­yl)dibenzene­sulfonamide 
In the title compound, C14H16N2O4S2, the dihedral angle between the terminal phenyl rings is 77.07 (13)°. The geometries around the S atoms are distorted tetra­hedral, with O—S—O angles of 120.66 (12) and 119.44 (11)°. In the crystal, mol­ecules are stacked in columns along the a axis via inter­molecular N—H⋯O and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536811030157
PMCID: PMC3200692  PMID: 22064806
7.  N,N′-[4,4′-Methyl­enebis(4,1-phenyl­ene)]bis­(2,6-difluoro­benzamide) 
The complete mol­ecule of the title compound, C27H18F4N2O2, is generated by crystallographic twofold symmetry, with one C atom lying on the rotation axis. The dihedral angle between fluoro-substituted phenyl ring and the adjacent benzene ring is 10.37 (5)°. In the crystal, mol­ecules are connected by N—H⋯O and C—H⋯F hydrogen bonds, resulting in supra­molecular chains propagating along the c direction.
doi:10.1107/S1600536811024524
PMCID: PMC3151792  PMID: 21837199
8.  Bis(2,6-diamino­pyridinium) bis­(hydrogen oxalate) monohydrate 
The asymmetric unit of the title compound, 2C5H8N3 +·2C2HO4 −·H2O, contains two crystallographically independent 2,6-diamino­pyridinium cations, a pair of hydrogen oxalate anions and a water mol­ecule. Both 2,6-diamino­pyridinium cations are planar, with maximum deviations of 0.011 (2) and 0.015 (1) Å, and are protonated at the pyridine N atoms. The hydrogen oxalate anions adopt twisted conformations and the dihedral angles between the planes of their carboxyl groups are 31.01 (11) and 63.48 (11)°. In the crystal, the cations, anions and water mol­ecules are linked via O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional network.
doi:10.1107/S1600536811004119
PMCID: PMC3052081  PMID: 21522352
9.  2,6-Diamino­pyridinium 2-carb­oxy­benzoate 
In the crystal of the title mol­ecular salt, C5H8N3 +·C8H5O4 −, the diamino­pyridine cation and the phthalate anion are linked by a pair of N—H⋯O hydrogen bonds. Within the phthalate anion, an almost symmetrical O—H⋯O hydrogen bond is observed. The ion pairs are linked by further N—H⋯O hydrogen bonds, generating a two-dimensional network lying parallel to (10).
doi:10.1107/S1600536810032903
PMCID: PMC3008098  PMID: 21588757
10.  2-Amino-6-(2,6-difluoro­benzamido)­pyridinium chloride 
In the cation of the title compound, C12H10F2N3O+·Cl−, the dihedral angle between the pyridine and benzene rings is 16.1 (1)°. In the crystal structure, mol­ecules linked into two-dimensional sheets parallel to the bc plane by inter­molecular N—H⋯Cl, C—H⋯Cl and C—H⋯F hydrogen bonds.
doi:10.1107/S1600536810029624
PMCID: PMC3007299  PMID: 21588436
11.  2,6-Difluoro­benzoic acid 
In the title compound, C7H4F2O2, the dihedral angle between the benzene ring and the carboxyl­ate group is 33.70 (14)°. In the crystal structure, inversion dimers linked by pairs of O—H⋯O hydro­gren bonds occur, generating R 2 2(8) loops. The dimers are linked into sheets lying parallel to (102) by C—H⋯F hydrogen bonds.
doi:10.1107/S1600536810028758
PMCID: PMC3007258  PMID: 21588400
12.  Bis(2,6-diamino­pyridin-1-ium) hexa­aqua­cobalt(II) disulfate dihydrate 
In the title compound, (C5H8N3)2[Co(H2O)6](SO4)2·2H2O, the complete complex cation is generated by crystallographic inversion symmetry, such that the CoII cation is octa­hedrally coordinated by six water mol­ecules. The organic cation is essentially planar, with a maximum deviation of 0.013 (1) Å. In the crystal structure, the ions and mol­ecules are linked into a pseudo-layered three-dimensional supra­molecular network via O—H⋯O and N—H⋯O hydrogen bonds. Weak inter­molecular π–π inter­actions further stabilize the crystal structure [centroid–centroid distance = 3.5231 (4) Å].
doi:10.1107/S1600536810026693
PMCID: PMC3007492  PMID: 21588154
13.  2,6-Di(pyrrolidin-1-yl)pyridinium chloride monohydrate 
In the organic cation of the title compound, C13H20N3 +·Cl−·H2O, the two pyrrolidine rings adopt twisted conformations. The pyridine ring makes dihedral angles of 14.57 (6) and 23.96 (6)° with the mean planes of the pyrrolidine rings. In the crystal structure, pairs of bifurcated inter­molecular O—H⋯Cl hydrogen bonds link the water mol­ecules and chloride anions into an R 4 4(8) ring motif. Inter­molecular N—H⋯Cl, C—H⋯Cl and C—H⋯O hydrogen bonds further inter­connect these rings with the organic cations into a two-dimensional network parallel to the bc plane.
doi:10.1107/S160053681002427X
PMCID: PMC3007020  PMID: 21588023
14.  Triethyl­ammonium 4-nitro­benzene­sulfonate 
In the anion of the title molecular salt, C6H16N+·C6H4O5S−, the nitro group is twisted slightly from the benzene ring, making a dihedral angle of 3.16 (10)°. In the crystal structure, the cations and anions are linked into a two-dimensional network parallel to the ab plane by C—H⋯O and N—H⋯O hydrogen bonds.
doi:10.1107/S1600536810021379
PMCID: PMC3006815  PMID: 21587875
15.  Poly[μ2-aqua-(μ3-2,5-dichloro­benzene­sulfonato)sodium] 
In the title compound, [Na(C6H3Cl2O3S)(H2O)]n, the NaI ion is penta­coordinated by three dichloro­benzene­sulfonate anions and two water mol­ecules, forming a distorted trigonal-bipyramidal geometry. The NaI ions are bridged by the sulfonate groups and the water mol­ecules, leading to a polymeric layer structure parallel to the bc plane in which O—H⋯O hydrogen bonds are observed.
doi:10.1107/S1600536810018118
PMCID: PMC2979400  PMID: 21579334
16.  Monoclinic polymorph of poly[aqua(μ4-hydrogen tartrato)sodium] 
A monoclinic polymorph of the title compound, [Na(C4H5O6)(H2O)]n, is reported and complements an ortho­rhom­bic form [Kubozono, Hirano, Nagasawa, Maeda & Kashino (1993 ▶). Bull. Chem. Soc. Jpn, 66, 2166–2173]. The asymmetric unit contains a hydrogen tartrate anion, an Na+ cation and a water mol­ecule. The Na+ ion is surrounded by seven O atoms derived from one independent and three symmetry-related hydrogen tartrate anions, and a water mol­ecule, forming a distorted penta­gonal–bipyramidal geometry. Independent units are linked via a pair of inter­molecular bifurcated O—H⋯O acceptor bonds, generating an R 2 1(6) ring motif to form polymeric two-dimensional arrays parallel to the (100) plane. In the crystal packing, the arrays are linked by adjacent ring motifs, together with additional inter­molecular O—H⋯O inter­actions, into a three-dimensional network.
doi:10.1107/S1600536810000681
PMCID: PMC2979804  PMID: 21579620
17.  Diguanidinium bis­(μ-2-hydroxy­propane-1,2,3-tricarboxyl­ato)bis­[diaqua­zincate(II)] dihydrate 
The asymmetric unit of the title compound, (CH6N3)2[Zn2(C6H5O7)2(H2O)2]·2H2O, contains one-half of a centrosymmetric dizinc(II) complex anion, one guanidinium cation and one water mol­ecule. Each ZnII ion is hexa­coordinated by two citrate anions, one in a bidentate fashion and the second monodentate, and two water mol­ecules in a distorted octa­hedral geometry. Intra­molecular O—H⋯O hydrogen bonds add further stability to the mol­ecular structure. In the crystal structure, mol­ecules are linked into a three-dimensional framework by inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536809054439
PMCID: PMC2979955  PMID: 21579599
18.  Tetra­guanidinium bis­[citrato(3−)]cuprate(II) dihydrate 
The asymmetric unit of the title compound, (CH6N3)4[Cu(C6H5O7)2]·2H2O, contains one-half of a centrosymmetric CuII complex anion, two guanidinium cations and a water mol­ecule. The CuII ion, lying on a crystallographic inversion center, is hexa­coordinated with two citrate anions in a distorted octahedral geometry. An intra­molecular O—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal structure, mol­ecules are linked into a three-dimensional framework by inter­molecular N—H⋯O and O—H⋯O hydrogen bonds.
doi:10.1107/S1600536809046170
PMCID: PMC2971813  PMID: 21578581
19.  Bis(2,6-diamino­pyridinium) tartrate monohydrate 
In the title compound, 2C5H8N3 +·C4H4O6 2−·H2O, the two cations are essentially planar [maximum deviations = 0.023 (1) and 0.026 (1) Å]. In one of the cations, the protonated N atom and one of the amino group H atoms are hydrogen bonded to one of the carboxyl groups of the dianion through a pair of N—H⋯O hydrogen bonds, forming an R 2 2(8) ring motif. In the crystal structure, the tartrate anions and water mol­ecules are linked into chains along the c axis by inter­molecular O—H⋯O and C—H⋯O hydrogen bonds. The cations further link the anions and water mol­ecules into a three-dimensional extended structure by a network of N—H⋯O hydrogen bonds. The crystal structure is also stabilized by weak inter­molecular π–π inter­actions [centroid–centroid distance = 3.6950 (6) Å].
doi:10.1107/S1600536809044663
PMCID: PMC2971208  PMID: 21578515
20.  Tetra­kis(2,6-diamino­pyridinium) diphthalate 2,6-diamino­pyridine 
In the title compound, 4C5H8N3 +·2C8H4O4 2−·C5H7N3, the asymmetric unit consists of two protonated diamino­pyridine cations, one phthalate anion and one half of a diamino­pyridine mol­ecule, which has twofold rotation symmetry and is disordered over two positions with a site-occupancy ratio of 0.534 (3):0.466 (3). In the disordered structure, both pyridine rings are essentially planar, with maximum deviations of 0.011 (2) and 0.006 (2) Å, and these two rings are inclined to one another at a dihedral angle of 79.86 (10)°. In the crystal structure, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link the ions and mol­ecules into a three-dimensional network. The structure is further stabilized by C—H⋯π inter­actions.
doi:10.1107/S1600536809044468
PMCID: PMC2971263  PMID: 21578508
21.  Guanidinium 3-carb­oxy-2,3-dihydroxy­propanoate monohydrate 
In the title hydrated salt, CH6N3 +·C4H5O6 −·H2O, the deprotonated carboxyl group is disordered over two positions with a site-occupancy ratio of 0.945 (3):0.055 (3). The bond lengths in the guanidinium cation are inter­mediate between normal C—N and C=N bond lengths, indicating significant delocalization in this species. In the crystal structure, anions and water mol­ecules are linked into sheets parallel to the ab plane by inter­molecular O—H⋯O hydrogen bonds. The linking of the anions and water mol­ecules with the cations by inter­molecular N—H⋯O hydrogen bonds creates a three-dimensional network.
doi:10.1107/S1600536809037313
PMCID: PMC2970441  PMID: 21577956

Results 1-21 (21)