RESUMEN
The title compound (3-methyl-1,5-dioxaspiro[5.5]undecan-3-yl)methanol (C11H20O3, Mr = 200.27) was synthesized by the aldol reaction of 1,1,1-tris(hydroxymethyl)ethane with cyclohexane in the presence of sulfonated carbon in cyclohexane and N, N-dimethylbenzamide, and its structure was characterized by melting points, elemental analysis, IR spectra, 1H NMR and single-crystal X-ray diffraction. The crystal of the title compound belongs to monoclinic system, space group C2/c with a = 31.308(8), b = 6.3544(16), C = 11.356(3) Å, α = 90, ß = 91.953(3), γ = 90°, V = 2258.0(10) Å3, Z = 8, Dc = 1.178 g/cm3, µ (Mo-Kα) = 0.084 mm-1, F(000) = 880, R = 0.0755 and wR(l > 2σ(l)) = 0.2225. X-ray diffraction results show that the 1,3-dioxane ring in the title compound is non-planar and exhibits a chair conformation, and adjacent molecules are connected by hydrogen bonding interaction into a one-dimensional chain structure. In addition, its biological activity was also evaluated.
RESUMEN
Single crystalline one-dimensional (1D) nanostructures of silver telluride (Ag2Te) with well-controlled shapes and sizes were synthesized via the hydrothermal reduction of sodium tellurite (Na2TeO3) in a mixed solution. The morphological evolution of various 1D nanostructures was mainly determined by properly controlling the nucleation and growth process of Ag2Te in different reaction times. Based on the transmission electron microscopy and scanning electron microscopy studies, the formation mechanism for these 1D nanostructures was rationally interpreted. In addition, the current-voltage (I-V) characteristics as a function of magnetic field of the highly single crystal Ag2Te nanowires were systematically measured. From the investigation of I-V characteristics, we have observed a rapid change of the current in low magnetic field, which can be used as the magnetic field sensor. The magneto-resistance behavior of the Ag2Te nanowires with monoclinic structure was also investigated. Comparing to the bulk and thin film materials, we found that there is generally a larger change in R (T) as the sample size is reduced, which indicates that the size of the sample has a certain impact on magneto-transport properties. Simultaneously, some possible reasons resulting in the observed large positive magneto-resistance behavior are discussed.
RESUMEN
In the title compound, {[NiWO(4)(C(16)H(36)N(4))]·4H(2)O}(n), the Ni(II) ion lies on an inversion center and is octahedrally coordinated by four N atoms of the tetradentate macrocyclic 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane (L) ligand in the equatorial plane and two O atoms of [WO(4)](2-) anions in axial positions. Each [WO(4)](2-) anion bridges two adjacent [NiL](2+) cations, forming a chain along [001]. The chains are further connected via N-Hâ¯O, O-Hâ¯O and C-Hâ¯O hydrogen-bonding inter-actions, generating a three-dimensional structure.
RESUMEN
In the title compound, C(12)H(13)ClO(4), the 1,3-dioxane ring adopts a chair conformation and the 2-chloro-benzene and methyl substituents occupy equatorial sites. The carboxyl group is in an axial inclination. In the crystal, carb-oxy-lic acid inversion dimers linked by pairs of O-Hâ¯O hydrogen bonds generate R(2) (2)(8) loops.
RESUMEN
In the title compound, C(12)H(24)O(4), the dioxane ring adopts a chair conformation; the n-hexyl chain, which occupies an equatorial position, has an extended zigzag conformation. In the crystal, mol-ecules are connected by O-Hâ¯O hydrogen-bonds into a zigzag chain running along the b axis, giving rise to a herringbone pattern.
RESUMEN
In the title compound, C(13)H(26)O(4), the dioxane rings adopts a chair conformation; the n-heptyl chain occupies an equatorial position. In the crystal, mol-ecules are connected by O-Hâ¯O hydrogen bonds into a zigzag chain running along the a axis, giving rise to a herringbone pattern. There are two independent mol-ecules in the asymmetric unit.
RESUMEN
THE CHIRAL TITLE COMPOUND [SYSTEMATIC NAME: 4-(1-methyl-vinyl)cyclo-hexene-1-carbaldehyde oxime], C(10)H(15)NO, crystallizes with two mol-ecules in the asymmetric unit, one of which shows disorder of its propenyl substituent over two sets of sites in a 50:50 ratio. In both mol-ecules, the six-membered carbaldehyde oxime ring adopts an approximate envelope conformation in which the C atom bearing the propenyl substituent represents the flap position. In both mol-ecules, the plane passing through the propenyl substituent is nearly perpendicular to the mean plane of the six-membered ring [dihedral angles = 84.6â (6) and 87.4â (3)°]. In the crystal, the two independent mol-ecules are linked by a pair O-Hâ¯N hydrogen bonds across a pseudo-inversion centre, generating a dimer. The unit cell of the known racemate of the title compound is similar to the cell found here, but with space group P.
RESUMEN
The four six-membered rings all adopt chair conformations in the two independent mol-ecules of the title cyclo-hexa-none cyclic diacetal with penta-erythritol, C(17)H(28)O(4).
RESUMEN
The title compound, C(25)H(26)O(2), crystallizes with two crystallographically independent mol-ecules in the asymmetric unit. The differences between the two mol-ecules are marginal. The three benzene rings of each mol-ecule are in a propeller orientation and the 1,3-dioxane ring adopts a chair conformation.
RESUMEN
The title compound, [Ni(C(8)H(5)O(4))(C(16)H(36)N(4))]ClO(4)·H(2)O, has the Ni(II) atom in a distorted octa-hedral geometry, surrounded by coordination by four N atoms of the 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane ligand in a folded configuration, and two carboxyl-ate O atoms of the 2-carboxy-benzoate ligand in cis positions. The complex cation, the disordered perchlorate anion [occupancies 0.639â (8):0.361â (8)] and uncoordinated water mol-ecules engage in N-Hâ¯O and O-Hâ¯O hydrogen bonding, forming a layer structure parallel to (010).
RESUMEN
The Ni atom in the title salt, [Ni(C(7)H(5)O(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, is in a six-coordinate octa-hedral geometry. The metal atom is chelated by the carboxyl-ate group, and the macrocyclic ligand adopts a folded configuration. The cation, anion and water mol-ecules engage in hydrogen bonding to form a layer structure.
RESUMEN
In the title compound, C(12)H(16)O(4), the 1,3-dioxane ring adopts a chair conformation; the 2-phenyl substitutent occupies an equatorial position. Adjacent mol-ecules are linked by O-Hâ¯O hydrogen bonds into a chain.
RESUMEN
In the title compound, [Ag(2)(C(6)H(6)NO(3)S)(2)(C(10)H(8)N(2))(2)](n), the Ag(I) atom is four-coordinated by two N atoms from two symmetry-related 4,4'-bipyridine (bipy) and two O atoms from two independent 4-amino-benzene-sulfonate (ABS) ligands. The two inter-chain Ag(I) atoms are bridged by two independent ABS ligands through weak Ag-O bonds and Agâ¯Ag attractions, forming a ladder-like chain coordination polymer [Ag(2)(ABS)(2)(bipy)(2)](n) parallel to [001], which is further linked to generate a two-dimensional structure via N-Hâ¯O hydrogen-bonding inter-actions.
RESUMEN
In the title compound, [Ni(C(7)H(5)O(2))(C(16)H(36)N(4))]ClO(4)·C(7)H(6)O(2), the Ni atom displays a distorted octa-hedral coordination geometry with four N atoms of the ligand rac-5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane (L) in a folded configuration and two benzoate (bz) O atoms. The [Ni(rac-L)(bz)](+) complex cation, perchlorate anion and benzoic acid mol-ecules engage in hydrogen bonding, with Nâ¯O distances between 2.970â (3) and 3.123â (3)â Å and an Oâ¯O distance of 2.691â (3)â Å.
RESUMEN
In the title compound, C(26)H(26)O(4), steric crowding of the Ph(3)C- group with the -CH(CO(2)Et)(2) unit leads to a long C-C bond [1.585â (2)â Å]. One of the two ethyl groups is disordered over two sites in a 60:40 ratio.
