87 research outputs found
Triaqua-1κO,2κ2 O-bis(2,2′-bipyridine)-1κ2 N,N′;2κ2 N,N′-chlorido-1κCl-μ-terephthalato-1:2κ2 O 1:O 4-dicopper(II) nitrate monohydrate
In the binuclear title compound, [Cu2(C8H4O4)Cl(C10H8N2)2(H2O)3]NO3·H2O, the two crystallographically independent CuII ions have similar coordination environments. One of the CuII ions has a square-pyramidal arrangement, which is defined by a water molecule occupying the apical position, with the equatorial ligators consisting of two N atoms from a 2,2′-bipyridine molecule, one carboxylate O atom from a terephthalate ligand and one O atom from a water molecule. The other CuII ion has a similar coordination environment, except that the apical position is occupied by a chloride ligand instead of a water molecule. An O—H⋯O and O—H⋯Cl hydrogen-bonded three-dimensional network is formed between the components
Dichlorido(4′-ferrocenyl-2,2′:6′,2′′-terpyridine-κ3 N,N′,N′′)zinc acetonitrile monosolvate
The title complex, [FeZn(C5H5)Cl2(C20H14N3)]·CH3CN, is composed of one ZnII atom, one 4′-ferrocenyl-2,2′:6′,2′′-terpyridine (fctpy) ligand, two Cl atoms and one acetonitrile solvent molecule. The ZnII atom is five-coordinated in a trigonal–bipyramidal geometry by the tridentate chelating fctpy ligand and two Cl atoms
Poly[[[bis(acetato-κO)copper(II)]-μ-1,4-diimidazol-1-ylbenzene-κ2 N 3:N 3′] dihydrate]
In the title linear coordination polymer, {[Cu(C2H3O2)2(C12H10N4)]·2H2O}n, the CuII atom is coordinated by two N atoms from two different symmetry-related 1,4-diimidazol-1-ylbenzene (dib) ligands and two carboxylate O atoms from two acetate ligands in a square-planar geometry. The Cu atoms are linked by the dib ligands, forming an extended chain. These chains are linked by O—H⋯O hydrogen bonds into a three-dimensional supramolecular network. The CuII atom lies on a center of inversion
1-(2-Naphthyl)-3-phenylprop-2-en-1-one
The title compound, C19H14O, contains two independent molecules with the same s-cis conformation for the ketone unit. Both molecules are non-planar with dihedral angles of 51.9 (1) and 48.0 (1)° between the benzene ring and the naphthalene ring system. In the crystal, neighboring molecules are stabilized by intermolecular C—H⋯π interactions, giving a two-dimensional supramolecular array parallel to the ab plane
(4′-Ferrocenyl-2,2′:6′,2′′-terpyridine-κ3 N 1,N 1′,N 1′′)(1,10-phenanthroline-κ2 N,N′)zinc(II) bis(perchlorate) acetonitrile monosolvate
In the title complex, [FeZn(C5H5)(C20H14N3)(C12H8N2)](ClO4)2·CH3CN, the ZnII atom is five-coordinated by a tridentate chelating 4′-ferrocenyl-2,2′:6′,2′′-terpyridine (fctpy) ligand and a bidentate chelating 1,10-phenanthroline (phen) ligand in a distorted square-pyramidal environment with a phen N atom located at the apical position [Zn—N = 2.259 (4) Å]. The terpyridyl motif in each fctpy ligand is coplanar, but the cyclopentadienyl ring is twisted by 9.5 (2)° out of coplanarity with each central pyridine. The two cyclopentadienyl rings of the ferrocenyl group are almost eclipsed with a deviation of 4.5 (1)°. In addition, intermolecular π–π interactions [centroid–centroid distance 3.753 (2) Å] are present between the cyclopentadienyl and outer pyridyl rings of the fctpy ligands. One of the perchlorate anions is equally disordered over two positions
(4′-Ferrocenyl-2,2′:6′,2′′-terpyridine-κ3 N,N′,N′′)(1,10-phenanthroline-κ2 N,N′)copper(II) bis(perchlorate) acetonitrile solvate
The title complex, [CuFe(C5H5)(C20H14N3)(C12H8N2)](ClO4)2·C2H3N, consists of a mononuclear [Cu(C12H8N2)(C25H19FeN3)]2+ cation, two ClO4
− anions (one of which is disordered over two positions with equal occupancy) and one CH3CN solvent molecule. The CuII center has a distorted square-pyramidal coordination with three N atoms of the 4′-ferrocenyl-2,2′:6′,2′′- terpyridine (fctpy) ligand and one 1,10-phenanthroline (phen) N atom in the basal plane and a second phen N atom in the apical position with an axial distance of 2.254 (4) Å. The disordered ClO4
− anion is weakly coordinated to the CuII ion with a Cu—O distance of 2.766 (11) Å. The two cyclopentadienyl rings of the ferrocenyl group are almost eclipsed with a deviation of 4.7 (1) °, and are involved in intermolecular π–π interactions with the outer pyridyl rings of the fctpy ligands [centroid–centroid distance = 3.759 (2) Å.]
2,4,6-Tri-p-tolylpyridine
In the title compound, C26H23N, the complete molecule is generated by crystallographic mirror symmetry, with the N atom and four C atoms lying on the reflection plane. The dihedral angles between the pyridine ring and pendant benzene rings are 2.9 (1), 14.1 (1) and 14.1 (1)°. Neighbouring molecules are stabilized through intermolecular π–π interactions along the c axis [centroid-to-centroid distance = 3.804 (2) Å], forming one-dimensional chains
catena-Poly[[[diaquacadmium(II)]-bis[μ-3,5-bis(isonicotinamido)benzoato]] tetrahydrate]
The title compound, {[Cd(C19H13N4O4)2(H2O)2]·4H2O}n or {[Cd(BBA)2(H2O)2]·4H2O}n, where BBA is 3,5-bis(isonicotinamido)benzoate, is isotypic with its Mn isologue [Chen et al. (2009 ▶). J. Coord. Chem.
62, 2421–2428]. The cation sits on a twofold axis and is six-coordinated in a slightly distorted octahedral geometry; the polyhedra are linked into zigzag chains, which are further connected by N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds as well as π–π interactions [centroid-centroid distance of 3.639 (2) Å], giving a three-dimensional supramolecular framework
New Insights into Traffic Dynamics: A Weighted Probabilistic Cellular Automaton Model
From the macroscopic viewpoint for describing the acceleration behavior of
drivers, this letter presents a weighted probabilistic cellular automaton model
(the WP model, for short) by introducing a kind of random acceleration
probabilistic distribution function. The fundamental diagrams, the
spatio-temporal pattern are analyzed in detail. It is shown that the presented
model leads to the results consistent with the empirical data rather well,
nonlinear velocity-density relationship exists in lower density region, and a
new kind of traffic phenomenon called neo-synchronized flow is resulted.
Furthermore, we give the criterion for distinguishing the high-speed and
low-speed neo-synchronized flows and clarify the mechanism of this kind of
traffic phenomena. In addition, the result that the time evolution of
distribution of headways is displayed as a normal distribution further
validates the reasonability of the neo-synchronized flow. These findings
suggest that the diversity and randomicity of drivers and vehicles has indeed
remarkable effect on traffic dynamics.Comment: 12 pages, 5 figures, submitted to Europhysics Letter
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