156 research outputs found
4,6-Dimethylpyrimidin-2(1H)-one–urea–water (1/1/1)
In the crystal structure of the title compound, C6H8N2O·CH4N2O·H2O, molecules are linked via N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds, forming a three–dimensional framework
2,2′-(Butane-1,4-diyl)diisoquinolinium tetrachloridozincate(II)
The crystal of the title compound, (C22H22N2)[ZnCl4], consists of 2,2′-(butane-1,4-diyl)diisoquinolinium organic cations and [ZnCl4]2− complex anions. The cation is located across a twofold axis and the ZnII atom of the anion is located on the other twofold axis. The centroid–centroid distance between parallel pyridine rings of neighboring molecules is 3.699 (3) Å, but the face-to-face separation of 3.601 (3) Å suggests there is no significant π–π stacking in the crystal structure
Interaction of a symmetrical α,α',δ,δ'-Tetramethyl-cucurbit[6]uril with Ln³⁺ : potential applications for isolation of lanthanides
The interaction of a symmetrical α,α′,δ,δ′-tetramethyl-cucurbit[6]uril (TMeQ[6]) with a series of lanthanide cations (Ln³⁺) was investigated in neutral water and in acidic solution. Analysis by single crystal X-ray diffraction revealed that different isomorphous families formed under different synthetic conditions. Such differences in the interaction between TMeQ[6] and Ln³⁺ could potentially be used for isolating heavier Ln³⁺ from their lighter counterparts in neutral solution, and lighter lanthanide cations from their heavier counterparts in acidic solution
3-(Benzimidazolium-2-yl)propionate dihydrate
In the crystal struture of the title compound, C10H10N2O2·2H2O, the component species are linked to the water molecules by N—H⋯O and O—H⋯O hydrogen bonds to form a three-dimensional network structure
Experimental Realization of Nonadiabatic Holonomic Single-Qubit Quantum Gates with Two Dark Paths in a Trapped Ion
For circuit-based quantum computation, experimental implementation of
universal set of quantum logic gates with high-fidelity and strong robustness
is essential and central. Quantum gates induced by geometric phases, which
depend only on global properties of the evolution paths, have built-in
noise-resilience features. Here, we propose and experimentally demonstrate
nonadiabatic holonomic single-qubit quantum gates on two dark paths in a
trapped ion based on four-level systems with resonant
drives. We confirm the implementation with measured gate fidelity through both
quantum process tomography and randomized benchmarking methods. Meanwhile, we
find that nontrivial holonomic two-qubit quantum gates can also be realized
within current experimental technologies. Compared with previous
implementations on three-level systems, our experiment share both the advantage
of fast nonadiabatic evolution and the merit of robustness against systematic
errors, and thus retains the main advantage of geometric phases. Therefore, our
experiment confirms a promising method for fast and robust holonomic quantum
computation.Comment: 13 pages, 5 figure
3a,11b-Dihydroxy-2-oxo-2,3,3a,11b-tetrahydro-1H-imidazo[4,5-f][1,10]phenanthrolin-7-ium chloride
In the crystal structure of the title compound, C13H11N4O3
+·Cl−, the dihedral angle between the two pyridine rings is 9.72 (9) Å. Ions are linked via N—H⋯Cl, O—H⋯Cl and O—H⋯O hydrogen bonds, forming a three-dimensional framework
2,2′-(Decane-1,10-diyl)dibenzimidazolium dichloride trihydrate
The organic cation in the title compound, C24H32N4
2+·2Cl−·3H2O, is situated on an inversion centre. The cations, anions and water molecules are linked via N—H⋯O, N—H⋯Cl, O—H⋯O and O—H⋯Cl hydrogen bonds and C—H⋯π interactions, forming a three-dimensional framework
Octane-1,8-diyldipyridinium dibromide dihydrate
The asymmetric unit of the title compound, C18H26N2
2+·2Br−·2H2O, consists of one-half of the organic cation, one Br− anion and one water molecule. The organic cation is situated on a centre of inversion. The dihedral angle between the pyridine ring and the plane of the central linkage is 59.3 (1)°. The cations, anions and water molecules are linked via O—H⋯Br, C—H⋯Br and C—H⋯O hydrogen bonds, forming a three-dimensional framework
N′-(Phenylsulfonyl)isonicotinohydrazide monohydrate
In the title compound, C12H11N3O3S·H2O, the pyridine ring makes a dihedral angle of 24.78 (14)° with the phenyl ring. Intramolecular N—H⋯O and intermolecular O—H⋯O hydrogen bonds are observed and stabilize the packing in the crystal structure
2-(2-Furyl)-1H-imidazo[4,5-f][1,10]phenanthroline-3,7-diium dichloride monohydrate
The organic cation of the title salt, C17H12N4O2+·2Cl−·H2O, is nearly planar, the dihedral angle between two pyridine rings being 2.53 (16)° and that between the pyridinum and furan rings being 4.17 (19)°. Molecules are linked via N—H⋯O, N—H⋯Cl and O—H⋯Cl hydrogen bonds, forming a three-dimensional framework and π–π stacking interactions help to stabilize the crystal structure [the imidazole–pyridine and imidazole–benzene centroid–centroid distances are 3.501 (3) and 3.674 (3) Å; respectively]
- …