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author:("Ali, based F.")
1.  3-Bromo-N-(3,5-di-tert-butyl­phen­yl)propanamide 
The title compound, C17H26BrNO, exhibits a small twist between the amide residue and the benzene ring [C—N—C—C torsion angle = 29.4 (5)°]. In the crystal, the amido NH group is involved in N—H⋯O hydrogen bonding, which connects mol­ecules into chains parallel to the c axis.
doi:10.1107/S1600536814012094
PMCID: PMC4120558  PMID: 25161559
2.  Bis(2,4-dimethyl­pyridinium) tetra­bromido­mercurate(II) 
The asymmetric unit of the title compound, (C7H10N)2[HgBr4], consists of one cation and one half-anion, bis­ected by a twofold rotation axis passing through the metal atom. The anion exhibits a distorted tetra­hedral arrangement about the HgII atom. In the crystal, the cations and anions are linked by N—H⋯Br hydrogen-bonding inter­actions along [010]. Cation–cation π–π stacking and Br⋯Br inter­molecular inter­actions are absent.
doi:10.1107/S1600536812046788
PMCID: PMC3588751  PMID: 23468716
3.  Bis(2,4,6-trimethyl­pyridinium) tetra­bromidozincate 
In the title compound, (C8H12N)2[ZnBr4], the coordination geometry of the anion is approximately tetra­hedral. The Zn—Br bond lengths range from 2.3901 (19) to 2.449 (2) Å and the Br—Zn—Br angles range from 107.09 (8) to 112.48 (8)°. In the crystal, each [ZnBr4]2− anion is connected to four cations through two N—H⋯Br and two C—H⋯Br hydrogen bonds, forming two-dimensional ⋯(cation)2⋯anion⋯(cation2)⋯ sheets parallel to the bc plane. Within each sheet, the anions are arranged in stacks with no significant inter-anion Br⋯Br inter­actions [the shortest being > 4.3 Å], while the cations are in chains, with weak π–π stacking inter­actions [centroid–centroid distance = 3.991 Å] between cations inter­acting with the same anion.
doi:10.1107/S1600536812040925
PMCID: PMC3515090  PMID: 23284317
4.  3-(Ammonio­meth­yl)pyridinium dibromide 
In the title salt, C6H10N2 2+·2Br−, the non-H atoms of the 3-methyl­pyridinium unit of the cation are almost coplanar (r.m.s. deviation = 0.0052 Å). In the crystal, the dications and Br anions are linked by a combination of six hydrogen bonds, viz. one Npy—H⋯Br, two C—H⋯Br and three H2N–H⋯Br, into supra­molecular layers, parallel to the bc plane, composed of alternating R24(10) and R24(8) loops. Weak π–π inter­actions between cationic rings with centroid–centroid distances of 3.891 (2) Å are also observed.
doi:10.1107/S1600536812040937
PMCID: PMC3515173  PMID: 23284400
5.  Redetermination of 2,2′-bipyridine-1,1′-diium dibromide 
In the title mol­ecular salt, C10H10N2 2+·2Br−, the dihedral angle between the aromatic rings is 20.83 (14)° and the N—H groups have a transoid conformaton [N—C—C—N = 158.5 (3)°]. In the crystal, the cations are linked to the anions by two N—H⋯Br and five C—H⋯Br hydrogen bonds, generating corrugated sheets incorporating R 2 1(7), R 4 2(10), R 4 2(11) and two different R 4 2(12) loops. This structure was originally reported by Nakatsu et al. [Acta Cryst (1972), A28, S24], but no atomic coordinates are available.
doi:10.1107/S1600536812040214
PMCID: PMC3470387  PMID: 23125800
6.  2,6-Dimethyl­pyridinium bromide 
The asymmetric unit of the title salt, C7H10N+·Br−, comprises two 2,6-dimethyl­pyridinium cations and two bromide anions. One cation and one anion are situated in general positions, while the other cation and the other anion lie on a crystallographic mirror plane parallel to (010). Each pair of ions inter­act via N—H⋯Br and C—H⋯Br hydrogen bonding, generating motifs depending on the cation and anion involved. Thus, the cation and the anion on the mirror plane generate infinite chains along the c axis, while the other ionic pair leads to sheets parallel to the ac plane. In the overall crystal packing, both motifs alternate along the b axis, with a single layer of the chain motif sandwiched between two double layers of the sheet motif. The sheets and chains are further connected via aryl π–π inter­actions [centroid–centroid distances = 3.690 (2) and 3.714 (2) Å], giving a three-dimensional network.
doi:10.1107/S1600536812039578
PMCID: PMC3470347  PMID: 23125760
7.  3-Methyl­amino-3-phenyl­propan-1-ol 
The title compound, C10H15NO, is an amino alcohol with the hy­droxy group residing on the terminal C atom. Apart from the hy­droxy group and the phenyl ring, all non-H atoms are almost coplanar. In the crystal, classical O—H⋯N and N—H⋯O hydrogen bonds connect the mol­ecules into centrosymmetric dimers [R 2 2(12) descriptor] and tetra­meric units [R 4 4(8) descriptor] as ring motifs, consolidating a three-dimensional network.
doi:10.1107/S160053681203694X
PMCID: PMC3470215  PMID: 23125659
8.  2-Amino-5-methyl­pyridinium dibromo­iodate 
In the title salt, C6H9N2 +·Br2I−, the cation is essentially planar (r.m.s. deviation = 0.0062 Å for the non-H atoms) while the anion is almost linear with a Br—I—Br angle of 177.67 (2)°. The crystal packing shows two anions and two cations connected via N—H⋯Br and (pyridine)N—H⋯Br hydrogen-bonding inter­actions, forming centrosymmetric tetra­mers with R44(16) ring motifs. Very weak offset aromatic π–π stacking interactions [centroid-centroid separation = 4.038 (4), slippage = 1.773 Å] also occur.
doi:10.1107/S1600536812036136
PMCID: PMC3435817  PMID: 22969663
9.  Bis(2,6-dimethyl­pyridinium) dibromo­iodate bromide 
In the title salt, 2C7H10N+·IBr2 −·Br−, each of the anions, viz. [IBr2]− and Br−, lie on a twofold axis. The IBr2 − anion is almost linear, with a Br—I—Br angle of 178.25 (3)°. The cation is essentially planar (r.m.s. deviation = 0.0067 Å). In the crystal, each Br− anion links two cations via N—H⋯Br⋯H—N hydrogen-bonding inter­actions.
doi:10.1107/S1600536812035702
PMCID: PMC3435755  PMID: 22969626
10.  Bis(N,N′,N′′-triisopropyl­guanidinium) fumarate–fumaric acid (1/1) 
The asymmetric unit of the title compound, C10H24N3 +·0.5C4H2O4 2−·0.5C4H4O4, comprises a triisopropyl­guanidinium cation, half of a fumarate dianion and half of a fumaric acid mol­ecule; both the fumarate dianion and the fumaric acid mol­ecule are located on inversion centres. In the crystal, inter­molecular O—H⋯O hydrogen bonds between the carboxyl groups of the fumaric acid mol­ecules and the carboxyl­ate groups of the fumarate anions lead to the formation of a hydrogen-bonded supra­molecular twisted chain along the b axis. The triisopropyl­guanidinium cations inter­act with the fumarate–fumaric acid chains via extensive N—H⋯O and C—H⋯O hydrogen bonds, leading to a ladder arrangement, with the cation being the rungs that bridge three curled chains of fumarate–fumaric acid. The crystal packing is stabilized by N—H⋯O and C—H⋯O (cation⋯fumarate/fumaric) and O—H⋯O (fumarate⋯fumaric) hydrogen bonds, consolidating a three-dimensional network.
doi:10.1107/S1600536812023094
PMCID: PMC3379463  PMID: 22719661
11.  N,N′,N′′-Tricyclo­hexyl­guanidinium iodide 
In the title compound, C19H36N3 +·I−, the orientation of the cyclo­hexyl rings around the planar (sum of N—C—N angles = 360°) CN3 + unit produces steric hindrance around the N—H groups. As a consequence of this particular orientation of the tricyclo­hexyl­guanidinium cation (hereafter denoted CHGH+), hydrogen bonding is restricted to classical N—H⋯I and non-clasical (cyclo­hex­yl)C—H⋯I hydrogen bonds. The propeller CHGH+ cation and the oriented hydrogen-bonding interactions lead to a three-dimensional supra­molecular structure.
doi:10.1107/S1600536811049683
PMCID: PMC3239094  PMID: 22199942

Results 1-11 (11)