Crystal structure of 2-amino-4,6-di-meth-oxy-pyrimidinium thio-phene-2-carboxyl-ate

In the title salt, C6H10N3O2 (+)·C5H3O2S(-), the 2-amino-4,6-di-meth-oxy-pyrimidinium cation inter-acts with the carboxyl-ate group of the thio-phene-2-carboxyl-ate anion through a pair of N-H⋯O hydrogen bonds, forming an R 2 (2)(8) ring motif. These motifs are centrosymmetrically paired via N-H⋯O hydrogen bonds, forming a complementary DDAA array. The separate DDAA arrays are linked by π-π stacking inter-actions between the pyrimidine rings, as well as by a number of weak C-H⋯O and N-H⋯O inter-actions. In the anion, the dihedral angle between the ring plane and the CO2 group is 11.60 (3)°. In the cation, the C atoms of methoxy groups deviate from the ring plane by 0.433 (10) Å.

Crystal structure of a mono-bridged calix[4]arene

The title compound, 5(2)-[(5-bromo-pent-yl)-oxy]-1(2),1(14),3(5),5(5)-tetra-tert-butyl-1(7),1(8),1(9),1(10)-tetra-hydro-1(6) H,1(16) H-1(4,12)-dibenzo[b,e][1,7]dioxa-cyclo-dodecina-3,5(1,3)-dibenzena-cyclo-hexa-phan-3(2)-ol, C54H73BrO4, was synthesized from the reaction of tert-butyl-calix[4]arene with 1,5-di-bromo-pentane using K2CO3 in CH3CN. The structure consists of a calixarene unit with a five-carbon bridge connecting two proximal phenolic O atoms, and with a bromo-pent-oxy chain on one of the remaining phenolic O atoms. The calixarene unit was found to have a flattened cone conformation with no solvent (or other guest) mol-ecule observed in the cavity. Two of the opposite phenyl rings lean outwards with fold angles of 136.2 (1) and 133.0 (1)° between the rings and the plane of the bridging methyl-ene C atoms, while the other two opposite rings form fold angles of 83.27 (9) and 105.46 (9)°. There is considerable disorder in this mol-ecule. One of the tert-butyl groups is disordered over two conformations with occupancies of 0.527 (5) and 0.473 (5). The bromo-pent-oxy chain is disordered over three configurations with occupancies of 0.418, 0.332 and 0.250. The five-carbon bridge connecting two proximal phenolic O atoms is disordered over two conformations with occupancies of 0.537 (7) and 0.463 (7).

Crystal structure of (2E)-2-meth-oxy-imino-2-{2-[(2-methyl-phen-oxy)meth-yl]phen-yl}-N'-(4-nitro-benzyl-idene)ethano-hydrazide

The title compound, C24H22N4O5, crystallizes with two mol-ecules in the asymmetric unit (Z' = 2) oriented almost perpendicular to each other [dihedral angle between the central core of each mol-ecule = 77.95 (3)°]. The two mol-ecules exhibit similar conformations with an extended structure. An intra-molecular C-H⋯N hydrogen bond occurs in each mol-ecule. The two mol-ecules are linked by a bifurcated N-H⋯(O,N) hydrogen bond involving the NH group in mol-ecule A as donor. They are further linked into a ribbon along the a-axis direction by further bifurcated N-H⋯(O,N) hydrogen bonds involving the NH group in mol-ecule B as donor. C-H⋯O inter-actions are also observed.

Crystal structure of (E)-2-{[(6-meth-oxy-1,3-benzo-thia-zol-2-yl)imino]-meth-yl}phenol

The title compound, C15H12N2O2S, crystallizes in the ortho-rhom-bic space group Pna21 , with two mol-ecules in the asymmetric unit (Z' = 2). Each mol-ecule consists of a 2-hy-droxy Schiff base moiety linked through a spacer to a 2-amino-benzo-thia-zole moiety. Each mol-ecule contains an intra-molecular hydrogen bond between the -OH group and imine N atom, forming a six-membered ring. The two independent molecules are linked by a pair of C-H⋯O hydrogen bonds, forming dimers with an R (2) 2(20) ring motif. These dimers are further lined into sheets in the ab plane by weak inter-molecular C-H⋯N inter-actions. The structure was refined as an inversion twin.

Fluoride-free Hiyama coupling by palladium abnormal N-heterocyclic carbene complexes

A series of Pd complexes of the 1,2,3-triazole based abnormal NHC ligands of the type (a-NHC)PdI₂(L) [L = NC₅H₅ and PPh₃] successfully catalyzed the fluoride-free Hiyama coupling in air.

Bis(chalcogenones) as pincer ligands: isolation and Heck activity of the selone-ligated unsymmetrical C,C,Se–Pd pincer complex

The reaction of meta-phenylene-bis(1-methyl-1H-imidazole-2(3H)-selone) with [Pd₂(μ-Cl)₂(2-C₆H₄CH₂NMe₂)₂] in dry benzene and glacial acetic acid resulted in the formation of an unsymmetrical 5,6-membered C,C,Se–Pd(ii) pincer complex.

Crystal structures of 2-meth-oxy-isoindoline-1,3-dione, 1,3-dioxoisoindolin-2-yl methyl carbonate and 1,3-dioxo-2,3-di-hydro-1H-benzo[de]isoquinolin-2-yl methyl carbonate: three anti-convulsant compounds

The title compounds, C9H7NO3, (1), C10H7NO5, (2), and C14H9NO5, (3), are three potentially anti-convulsant compounds. Compounds (1) and (2) are isoindoline derivatives and (3) is an iso-quinoline derivative. Compounds (2) and (3) crystallize with two independent mol-ecules (A and B) in their asymmetric units. In all three cases, the isoindoline and benzoiso-quinoline moieties are planar [r.m.s. deviations are 0.021 Å for (1), 0.04 and 0.018 Å for (2), and 0.033 and 0.041 Å for (3)]. The substituents attached to the N atom are almost perpendicular to the mean planes of the heterocycles, with dihedral angles of 89.7 (3)° for the N-O-Cmeth-yl group in (1), 71.01 (4) and 80.00 (4)° for the N-O-C(=O)O-Cmeth-yl groups in (2), and 75.62 (14) and 74.13 (4)° for the same groups in (3). In the crystal of (1), there are unusual inter-molecular C=O⋯C contacts of 2.794 (1) and 2.873 (1) Å present in mol-ecules A and B, respectively. There are also C-H⋯O hydrogen bonds and π-π inter-actions [inter-centroid distance = 3.407 (3) Å] present, forming slabs lying parallel to (001). In the crystal of (2), the A and B mol-ecules are linked by C-H⋯O hydrogen bonds, forming slabs parallel to (10-1), which are in turn linked via a number of π-π inter-actions [the most significant centroid-centroid distances are 3.4202 (7) and 3.5445 (7) Å], forming a three-dimensional structure. In the crystal of (3), the A and B mol-ecules are linked via C-H⋯O hydrogen bonds, forming a three-dimensional structure, which is consolidated by π-π inter-actions [the most significant inter-centroid distances are 3.575 (3) and 3.578 (3) Å].

Crystal structure of (5R)-5-[(1S)-1,2-di-hydroxy-eth-yl]-4-meth-oxy-3-phenyl-2,5-di-hydro-furan-2-one

In the title compound, C13H14O5, the furan ring is essentially planar [maximum deviation = 0.031 (3) Å] with a stereogenic center (R) at the sp (3) hybridized C atom. The C atom bearing the dihy-droxy ethyl group is S. The absolute configuration is based on the precursor in the synthesis. The two O-H groups are in an anti conformation with respect to each other. The mean plane of the furan-one group is twisted by 8.2 (4)° from that of the phenyl ring. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds involving furan-one C=O groups and symmetry-related hy-droxy groups, forming a two-dimensional network parallel to (001). Weak C-H⋯O hydrogen bonds are observed within the two-dimensional network.

Crystal structure of anhydrous poly[bis-(μ2-sarcosinato-κ(3) O,N:O')copper(II)]

The title compound, [Cu(C3H6NO2)2] n , is a bis-complex of the anion of sarcosine (N-methyl-glycine). The asymmetric unit consists of a copper(II) ion, located on a center of inversion, and one mol-ecule of the uninegative sarcosinate anion. The copper(II) ion exhibits a typical Jahn-Teller distorted [4 + 2] coordination geometry. The four shorter equatorial bonds are to the nitro-gen and carboxyl-ate O atoms of two sarcosinate anions, and the longer axial bonds are to carboxyl-ate O atoms of neighboring complexes. The overall structure is made up from two chains formed by these longer axial Cu-O bonds, one extending parallel to [011] and the other parallel to [0-11]. Each one-dimensional array is connected by the equatorial bridging moieties to the chains on either side, creating an extended two-dimensional framework parallel to (100). There is a single inter-molecular hydrogen-bonding inter-action within the sheets between the amino NH group and an O atom of an adjacent mol-ecule.

Three closely-related cyclohexanols (C35H27X2N3O3; X = F, Cl or Br): similar molecular structures but different crystal structures

Three highly-substituted cyclohexanol derivatives have been prepared from 2-acetylpyridine and 4-halogenobenzaldehydes under mild conditions. (1RS,2SR,3SR,4RS,5RS)-3,5-Bis(4-fluorophenyl)-2,4-bis(pyridine-2-carbonyl)-1-(pyridin-2-yl)cyclohexanol, C35H27F2N3O3, (I), (1RS,2SR,3SR,4RS,5RS)-3,5-bis(4-chlorophenyl)-2,4-bis(pyridine-2-carbonyl)-1-(pyridin-2-yl)cyclohexanol acetone 0.951-solvate, C35H27Cl2N3O3·0.951C3H6O, (II), and (1RS,2SR,3SR,4RS,5RS)-3,5-bis(4-bromophenyl)-2,4-bis(pyridine-2-carbonyl)-1-(pyridin-2-yl)cyclohexanol, C35H27Br2N3O3, (III), all crystallize in different space groups, viz. Pbca, Fdd2 and P1, respectively. In compound (II), the acetone molecule is disordered over two sets of atomic sites having occupancies of 0.690 (13) and 0.261 (13). Each of the cyclohexanol molecules contains an intramolecular O-H···N hydrogen bond and their overall molecular conformations are fairly similar. The molecules of (I) are linked by two independent C-H···O hydrogen bonds to form a C(5)C(10)[R2(2)(15)] chain of rings, and those of (III) are linked by a combination of C-H···O and C-H···N hydrogen bonds, forming a chain of alternating R2(2)(16) and R2(2)(18) rings. The cyclohexanol molecules in (II) are linked by a single C-H···N hydrogen bond to form simple C(4) chains and these chains are linked by a π-π stacking interaction to form sheets, to which the disordered acetone molecules are weakly linked via a number of C-H···O contacts.

Experimental and computational study on 2,2'-[(1E,2E)-hydrazine-1,2-diylidenedi(1E)eth-1-yl-1-ylidene]diphenol and its Ni(II), Pt(II), Pd(II) complexes

2,2'-[(1E,2E)-hydrazine-1,2-diylidenedi(1E)eth-1-yl-1-ylidene]diphenol and its dimeric, binuclear Ni(II), Pd(II) and Pt(II) metal complexes were synthesized. Hydrazine derivative and its complexes were characterized by elemental analyses, LC-MS, IR, electronic spectra, (1)H and (13)C NMR spectra, conductivity and magnetic measurements. 1H and 13C shielding tensors for crystal structure were calculated with GIAO/DFT/B3LYP/6-311++G(d,p) methods in CDCl3. The vibrational band assignments were performed at B3LYP/6-311++G(d,p) theory level combined with scaled quantum mechanics force field (SQMFF) methodology. The antibacterial activities of synthesized compounds were studied against some Gram-positive and Gram-negative bacteria by using the microdilution and disk diffusion method. As the antibacterial activity results evidently show, the compound possessed a broad spectrum of activity against the tested bacteria.

Crystal structure of N (1)-benzyl-N (1),N (2),N (2)-tri-methyl-ethane-1,2-diaminium dichloride

In the title mol-ecular salt, C12H22N2 (2+)·2Cl(-), which was obtained as a by-product in the attempted synthesis of a mercury derivative, the conformation of the N-C-C-N bond in the cation is anti [torsion angle = 175.1 (10)°]. In the crystal, the cations are linked to the anions by N-H⋯Cl hydrogen bonds, generating ion-triplets. These are linked by numerous weak C-H⋯Cl inter-actions, generating a three-dimensional network. The structure was refined as an inversion twin.

Crystal structure of 4-bromo-N-(2-bromo-3-nitrobenzyl)-2-nitronaphthalen-1-amine

In the title compound, C17H11Br2N3O4, the dihedral angle between the planes of the naphthalene system and the benzene ring is 52.86 (8)°. The nitro substituent and the attached naphthalene system are almost coplanar [dihedral angle = 5.6 (4)°], probably as a consequence of an intramolecular N—H...O hydrogen bond with the amine group. The nitro substituent attached to the benzene ring is disordered over two sets of sites with occupancies of 0.694 (3) and 0.306 (3). The major component deviates significantly from the ring plane [dihedral angle = 53.6 (2)°]. In the crystal, the molecules are linked into a three-dimensional array by extensive π–π interactions involving both the naphthalene and benzene rings [range of centroid–centroid distances = 3.5295 (16)–3.9629 (18) Å] and C—H...O interactions involving the methylene H atoms and the phenyl-attached nitro group.

Crystal structure of (N1-benzyl-N1,N2,N2-trimethylethane-1,2-diamine-κ2N,N′)dichloridomercury(II)

In the structure of the title compound, [HgCl2(C12H20N2)], the HgIIatom has a distorted tetrahedral coordination sphere defined by two tertiary amine N-atom donors, as well as two Cl−anions [the dihedral angle between the N—Hg—N and Cl—Hg—Cl planes is 82.80 (9)°]. The five-membered chelate ring adopts an envelope conformation, with puckering parameters ofQ(2) = 0.446 (6) Å and ϕ(2) = 88.8 (6)°, with the two amine CH3substituents on opposite sides of the ring. In the crystal, the molecules are linked by C—H...Cl interactions into a zigzag chain parallel to [101].

2-Bromo-5-tert-butyl-N-methyl-N-[2-(methylamino)phenyl]-3-(1-methyl-1H-benzimidazol-2-yl)benzamide

In the title compound, C₂₇H₂₉BrN₄O, benzimidazole ring system and the amide moiety are planar [r.m.s. deviations = 0.016 (2) and 0.017 (1) Å, respectively]. The mol­ecule adopts a conformation in which the amide linkage is almost perpendicular to the central ring [dihedral angle = 85.79 (8)°], while the benzimidazole ring system makes a dihedral angle of 70.26 (11)° with the central ring. In the crystal, the mol­ecules form dimers through N—H⋯O hydrogen bonds and C—H⋯O interactions. These dimers are further linked into zigzag ribbons along [201] by weak C—H⋯Br inter­actions. As a result of the bulky nature of the mol­ecule, as evidenced by the large dihedral angles between rings, there is little evidence for any π–π inter­actions.

4-(Furan-2-carbon-yl)piperazin-1-ium 3,5-di-nitro-benzoate

In the cation of the title salt, C9H13N2O2 (+)·C7H3N2O6 (-), the piperazine ring adopts a slightly distorted chair conformation. Twofold rotational disorder is exhibited by the furan ring in a 0.430 (4):0.570 (4) ratio. In the crystal, N-H⋯O hydrogen bonds link the ions into chains along [010]. Additional weak C-H⋯O inter-actions are observed, leading to a supra-molecular layer parallel to (011).

(E)-2-{[4-(Di-methyl-amino)-benzyl-idene]amino}-5-nitro-phenol

The title Schiff base compound, C₁₅H₁₅N₃O₃, crystallizes with two mol­ecules (A and B) in the asymmetric unit. Each mol­ecule adopts an E conformation around the C= N imine bond. The two mol­ecules have minor differences in their conformations. In mol­ecule A, the dihedral angle between the nitro group and its benzene ring is 2.1 (2)° and that between the two benzene rings is 0.88 (7)°, while the corresponding angles for mol­ecule B are 5.7 (1) and 2.45 (6)°, respectively. In each mol­ecule, there is an intra­molecular O—H⋯N hydrogen bond. In the crystal, inversion-related mol­ecules are linked via O—H⋯O hydrogen bonds forming A–A and B–B dimers. These dimers are linked via C—H⋯O hydrogen bonds involving the nitro O atoms, forming A–A–A and B–B–B slabs that lie parallel to one another and to (010).

2-Chloro-N-(2-chloro-benzo-yl)-N-(2-ethyl-4-oxo-3,4-di-hydro-quinazolin-3-yl)benzamide

In the title compound, C24H17Cl2N3O3, the quinazolinone ring system is close to planar (r.m.s. deviation = 0.0132 Å), with the imide unit almost perpendicular to it, subtending a dihedral angle of 89.1 (1)°. However, the imide unit itself is not planar, the dihedral angle between the two O=C-N components being 34.6 (1)°. The dihedral angle between the two chlorobenzene rings is 40.50 (7)°, while the angles between these rings and the imide moiety are 54.6 (1) and 58.2 (1)°, respectively. The dihedral angles between the 2-chloro-phenyl rings and the quinazolinone ring system are 48.77 (5) and 32.92 (7)° for rings A and B, respectively. In the crystal, weak C-H⋯O inter-actions link the mol-ecules into a three-dimensional array.

Tri-phenyl-tellurium chloride

The asymmetric unit of the title compound, C18H15ClTe, contains two mol-ecules which are in inverted orientations. The compound displays a tetra-hedral geometry around the Te atom in spite of there being five electron domains. This is attributed to the fact that the lone pair is not sterically active. The dihedral angles between the three phenyl rings are 76.51 (16)/73.75 (16)/71.06 (17) and 78.60 (17)/77.67 (16)/79.11 (16)° in the two mol-ecules. The crystal packing features eight C-H⋯π inter-actions.

(E)-2-{[(Furan-2-ylmeth-yl)imino]-meth-yl}-4-nitro-phenol

In the title compound, C₁₂H₁₀N₂O₄, the furan-2-ylmethyl group is disordered over two sets of sites, with refined occupancies of 0.858 (3) and 0.143 (3). In the major component of disorder, the dihedral angle between the furan and benzene rings is 63.1 (2)° and for the minor component this value is 67.9 (6)°. The planes of the nitro group and the attached benzene ring form a dihedral angle of 4.34 (17)°. In the crystal, inversion-related mol­ecules are linked by two pairs of weak C—H⋯O inter­actions, one involving the nitro group and the other involving the O—H group as an acceptor. As a result of these associations, ribbons are formed along [120]. A strong intra­molecular O—H⋯N hydrogen bond is observed.

Bis(η(5)-penta-methyl-cyclo-penta-dien-yl)aluminium tetra-bromido-aluminate

The title compound, [Al(C₁₀H₁₅)₂][AlBr₄], was formed during the reduction of a mixture of Cp*AlBr₂ and AlBr₃. The Al^III atoms of the two crystallographically independent cations each lie on an inversion center, and the [AlBr₄]⁻ anions are on general positions. At 123 K, the structure exhibits disorder in two of the Br atoms of the [AlBr₄]⁻ ion, with a ratio occupancy of 0.733 (6): 0.267 (3). In the crystal, there is possible weak hydrogen bonding between some methyl groups and Br atoms. The interactions link the moieties in a three-dimensional array.

4-Hydroxy-5-methoxy-N,1-dimethyl-2-oxo-N-[4-(trifluoromethyl)phenyl]-1,2-dihydroquinoline-3-carboxamide

The title compound, C₂₀H₁₇F₃N₂O₄, named tasquinimod, is a second-generation oral quinoline-3-carboxamide analogue, which is currently in phase III clinical trials for the treatment of metastatic prostate cancer. The quinoline unit is almost planar (r.m.s. deviation of fitted atoms = 0.0075 Å). The carboxamide side chain, substituted at position 3, is tilted by 88.07 (7)° to the quinoline plane. Both the methyl and carbonyl groups of this carboxamide side chain are in a syn conformation. The 4-(tri­fluoro­meth­yl)phenyl plane is inclined at 50.62 (17)° to the plane of the carboxamide side chain, and at 87.14 (4)° to the plane of the quinoline ring system. The 4-hy­droxy H atom acts as a double proton donor in an intra­molecular hydrogen bond to the 5-position meth­oxy O atom and in an inter­molecular contact to the 2-oxo group, generating a chain along [010] in the crystal structure.

Bis[(2-methyl-benz-yl)bis-(pyridin-2-ylmethyl-κN)amine-κN]manganese(II) bis-(perchlorate)

In the title complex, [Mn(C20H21N3)2](ClO4)2, two tridentate (2-methyl-benz-yl)bis-(pyridin-2-ylmeth-yl)amine (L) ligands form the Mn(II) complex [MnL 2](ClO4)2. The Mn(II) ion lies on a twofold axis and the complex cation is significantly distorted from regular octa-hedral geometry. The packing is stabilized by weak C-H⋯O inter-actions between the cations and anions, which link them into a zigzag ribbon along [101]. The perchlorate anion is disordered and was constrained to be tetra-hedral with two orientations having occupancies of 0.768 (4) and 0.232 (4). The 2-methylbenzyl moiety is also disordered over two sets of sites, with occupancies of 0.508 (15) and 0.492 (15).

1-Aza-niumyl-cyclo-butane-1-carboxyl-ate monohydrate

In the title compound, C5H9NO2·H2O, the amino acid is in the usual zwitterionic form involving the α-carboxyl-ate group. The cyclo-butane backbone of the amino acid is disordered over two conformations, with occupancies of 0.882 (7) and 0.118 (7). In the crystal, N-H⋯O and O-H⋯O hydrogen bonds link the zwitterions [with the water molecule involved as both acceptor (with the NH3 (+)) and donor (through a single carboxylate O from two different aminocyclobutane carb-oxylate moities)], resulting in a two-dimensional layered structure lying parallel to (100).

N-(3-Chloro-1,4-dioxo-1,4-dihydronaphthalen-2-yl)-N-propionylpropionamide

In the title molecule, C16H14ClNO4, the four essentially planar atoms of the imide group [r.m.s. deviation = 0.0286 (11) Å] form a dihedral angle of 77.36 (13)° with the naphthoquinone group [maximun deviation = 0.111 (2) Å for the carbonyl O atom in the naphthalene 1-position] and the two imide carbonyl groups are orientedantiwith respect to each other. In the crystal, molecules are connected by weak C—H...O hydrogen bonds, as well as π–π stacking interactions [centroid–centroid distance = 3.888 (3) Å], forming a three-dimensional network.

Poly[tetrakis(μ-1,1,1,3,3,3-hexafluoropropan-2-olato)iron(II)dipotassium]

The title compound, [K2Fe{OCH(CF3)2}4] n , was formed from the reaction of potassium hexa-fluoro-isopropoxide with iron(II) chloride in toluene. The Fe(II) atom has a highly distorted tetra-hedral coordination environment. All four of the non-equivalent hexa-fluoro-isoprop-oxy O atoms link the Fe(II) atoms to one of the K(+) atoms in an alternating chain of Fe-O-K-O fused four-membered rings, with K-Fe distances of 3.715 (2) and 3.717 (2) Å. This K(+) atom is also bridged to eight of the F atoms. The other K(+) atom is bonded to only two of the O atoms, but has seven short K⋯F contacts, one of which links the chains into a three-dimensional arrangement. Weak hydrogen bonding between the lone H atoms on the hexa-fluoro-isoprop-oxy groups and F atoms is also present. The crystal studied was refined as an inversion twin.

1,3,5-Tri-p-tolyl-pentane-1,5-diol

In the title compound, C₂₆H₃₀O₂, the central benzene ring forms dihedral angles of 14.85 (15) and 28.17 (14)° with the terminal benzene rings. The dihedral angle between the terminal benzene rings is 32.14 (13)°. The crystal packing exhibits two strong inter­molecular O—H⋯O hydrogen bonds, forming directed four-membered co-operative rings. A region of disordered electron density, most probably disordered ethyl acetate solvent mol­ecules, occupying voids of ca 519 ų for an electron count of 59, was treated using the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148–155]. Their formula mass and unit-cell characteristics were not taken into account during refinement. The structure was refined as an inversion twin [absolute structure parameter = −0.3 (4)].

Tris(2,6-dibenzoyl-4-methyl-phenolato-κ(2) O (1),O (2))cobalt(III)

In the title compound, [Co(C₂₁H₁₅O₃)₃], the Co^III ion is coordinated in a slightly distorted octa­hedral environment by three phenolate O and three benzoyl O atoms from three monoanionic bidentate 2,6-dibenzoyl-4-methyl­phenolate ligands. The dihedral angles between the mean planes of the central phenolate rings and the peripheral phenyl rings are 46.62 (10)/87.06 (9), 60.44 (8)/23.13 (8) and 46.49 (6)/65.29 (6)°. The crystal packing is stabilized by weak inter­molecular C—H⋯O inter­actions. Mol­ecules are further linked by two π–π [centroid–centroid distances = 3.8612 (14) and 3.9479 (14) Å] and four C—H⋯π inter­actions, forming a three-dimensional network.

2-(Naphthalen-1-yl)-1-phenyl-1H-benzimid-azole benzene hemisolvate

In the title compound, C₂₃H₁₆N₂·0.5C₆H₆, the benzimidazole unit [maximum deviation = 0.0258 (6) Å] and the naphthalene ring system [maximum deviation = 0.0254 (6) Å] are both essentially planar and make a dihedral angle of 61.955 (17)°. The imidazole ring makes dihedral angle of 61.73 (4)° with the phenyl ring. An intra­molecular C—H⋯N hydrogen bond generates an S(6) ring motif. In the crystal, seven weak C—H⋯π inter­actions involving the fused ring system, the benzene solvent mol­ecule, the imidazole phenyl rings are observed, leading to a three-dimensional architecture.

Di-aqua-bis-(2-ethyl-5-methyl-imidazole-4-sulfonato-κ(2) N (3),O)nickel(II) dihydrate

In the title complex, [Ni(C6H9N2O3S)2(H2O)2]·2H2O, the Ni(II) atom lies on an inversion center and is chelated by N and O atoms of two symmetry-equivalent imidazole-sulfonate ligands in the basal plane, and two water O atoms in axial positions in an overall octa-hedral configuration. The crystal structure displays O-H⋯O and N-H⋯O hydrogen bonds, which connect the components into an extended three-dimensional network.

2-Methyl-aspartic acid monohydrate

The title compound, C5H9NO4·H2O, is an isomer of the α-amino acid glutamic acid that crystallizes from water in its zwitterionic form as a monohydrate. It is not one of the 20 proteinogenic α-amino acids that are used in living systems and differs from the natural amino acids in that it has an α-methyl group rather than an α-H atom. In the crystal, an O-H⋯O hydrogen bond is present between the acid and water mol-ecules while extensive N-H⋯O and O-H⋯O hydrogen bonds link the components into a three-dimensional array.

Ethyl 6-(4-chloro-phen-yl)-4-(4-fluoro-phen-yl)-2-oxo-cyclo-hex-3-ene-1-carboxyl-ate

The asymmetric unit of the title compound, C₂₁H₁₈ClFO₃, contains two independent mol­ecules. In one mol­ecule (A), the 4-chloro­phenyl, oxo­cyclo­hex-3-ene, carboxyl­ate, and ethyl groups were refined as disordered over two sets of sites with a 0.684 (5):0.316 (5) ratio. The cyclo­hexene ring in the disordered mol­ecule is in a slightly distorted envelope conformation for the major component (with the C atom bound to the carboxylate group being the flap atom) and in a screw-boat conformation for the minor component. In the ordered mol­ecule (B), the cyclo­hexene ring is in a half-chair conformation. The dihedral angles between the mean planes of the fluoro- and chloro-substituted benzene rings are 89.9 (7) (only the major component is considered for A) and 76.4 (7)° (B). In the crystal, inversion dimers are observed along with weak C—H⋯O hydrogen bonds, which form chains along [100].

Isovaline monohydrate

The title compound, C5H11NO2·H2O, is an isomer of the α-amino acid valine that crystallizes from water in its zwitterion form as a monohydrate. It is not one of the 20 proteinogenic amino acids that are used in living systems and differs from the natural amino acids in that it has no α-H atom. The compound exhibits hydrogen bonding between the water mol-ecule and the carboxyl-ate O atoms and an amine H atom. In addition, there are inter-molecular hydrogen-bonding inter-actions between the carboxyl-ate O atoms and amine H atoms. In the crystal, these extensive N-H⋯O and O-H⋯O hydrogen bonds lead to the formation of a three-dimensional network.

3-[1-(4-Bromo-phen-yl)eth-oxy]-2,2,5-trimethyl-4-phenyl-3-aza-hexa-ne

The title compound, C22H30BrNO, is an alk-oxy-amine compound, an effective initiator in nitroxide-mediated free radical polymerization. It was prepared as a mixture of two diasteromers; the crystal for the X-ray analysis showed one of these as a pair of R,S and S,R enanti-omers. The tert-butyl and isopropyl groups are in an almost anti conformation in the crystal [C-N-C-C torsion angle = -168.8 (1)°], and the methyl group of the ethoxy group is in an approximate anti relationship to the tert-butyl group. The dihedral angle between the phenyl and benzene rings is 33.12 (7)°. The Br atom is disordered over two positions, with occupancies of 0.9139 (16) and 0.0861 (16). In the crystal, weak C-H⋯Br contacts link the mol-ecules into chains along [-110].

2-(Phenyl-selenon-yl)pyridine

In the title compound, C₁₁H₉NO₂Se, the pyridine and phenyl rings are almost perpendicular, with the dihedral angle between their mean planes being 79.16 (7)°. In the crystal, the mol­ecules pack so as to form ruffled sheets in the (110) plane connected by weak C—H⋯O inter­actions. In addition, there are weak π–π inter­actions between the mean planes of both the phenyl [centroid–centroid perpendicular distance of 3.591 (2) Å and slippage of 1.854 (2) Å] and pyridine rings [centroid–centroid perpendicular distance of 3.348 (2) Å and slippage of 1.854 (2) Å].