scholarly journals Isotropic–nematic transition of long, thin, hard spherocylinders confined in a quasi-two-dimensional planar geometry

2003 ◽  
Vol 119 (6) ◽  
pp. 3535-3540 ◽  
Author(s):  
Marco Cosentino Lagomarsino ◽  
Marileen Dogterom ◽  
Marjolein Dijkstra
Keyword(s):  
Planar Geometry ◽  
Two Dimensional ◽  
Hard Spherocylinders

scholarly journals Crystal structure ofN′′-benzyl-N′′-[3-(benzyldimethylazaniumyl)propyl]-N,N,N′,N′-tetramethylguanidinium bis(tetraphenylborate)

2015 ◽  
Vol 71 (12) ◽  
pp. o1086-o1087
Author(s):  
Ioannis Tiritiris ◽  
Willi Kantlehner
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Positive Charge ◽  
Planar Geometry ◽  
Methyl Groups ◽  
Two Dimensional ◽  
Single Bond ◽  
Double Bond Character ◽  
Bond Lengths ◽  
Bond Character

In the crystal structure of the title salt, C24H38N42+·2C24H20B−, the C—N bond lengths in the central CN3unit of the guanidinium ion are 1.3364 (13), 1.3407 (13) and 1.3539 (13) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charge is delocalized in the CN3plane. The bonds between the N atoms and the terminal methyl groups of the guanidinium moiety and the four C—N bonds to the central N atom of the (benzyldimethylazaniumyl)propyl group have single-bond character. In the crystal, C—H...π interactions between the guanidinium H atoms and the phenyl C atoms of the tetraphenylborate ions are present, leading to the formation of a two-dimensional supramolecular pattern parallel to theacplane.

Two-dimensional radiative transfer. I - Planar geometry

1978 ◽  
Vol 220 ◽  
pp. 1001 ◽  
Author(s):  
D. Mihalas ◽  
L. H. Auer ◽  
B. R. Mihalas
Keyword(s):  
Radiative Transfer ◽  
Planar Geometry ◽  
Two Dimensional

scholarly journals Crystal structure and thermal properties of a square-planar NiIIcomplex of cyanide and a tricyclic bis-amidine ligand formedin situunder solvothermal conditions

2013 ◽  
Vol 69 (6) ◽  
pp. 565-568 ◽  
Author(s):  
Monika Stolárová ◽  
Juraj Černák ◽  
Milagros Tomás ◽  
Larry R. Falvello
Keyword(s):  
Crystal Structure ◽  
Thermal Properties ◽  
Complex I ◽  
Structural Unit ◽  
Planar Geometry ◽  
Water Molecules ◽  
Two Dimensional ◽  
Square Planar ◽  
Cyanide Ligands ◽  
Solvothermal Conditions

The reaction ofN1,N1′-(ethane-1,2-diyl)bis(propane-1,3-diamine) (bapen), K2[Ni(CN)4]·H2O and dimethylformamide in the presence of Gd(NO3)3·6H2O under solvothermal conditions yielded yellow crystals of dicyanido(2,3,4,6,7,9,10,11-octahydropyrimido[2′,1′:3,4]pyrazino[1,2-a]pyrimidine)nickel(II) hemihydrate, [Ni(CN)2(C10H16N4)]·0.5H2O, (I), the crystal structure of which is composed of [Ni(CN)2(pdpm)] molecules (pdpm is 2,3,4,6,7,9,10,11-octahydropyrimido[2′,1′:3,4]pyrazino[1,2-a]pyrimidine) on general positions linked by O—H...N hydrogen bonds to water molecules located on twofold axes. This structural unit is further linked by nonclassical C—H...N interactions to form a warped two-dimensional net perpendicular to the unit-cellbaxis. The nets are stacked, with C—H...O contacts joining successive units. The NiIIcation is coordinated with square-planar geometry by a chelating pdpm ligand and two cyanide ligands in mutuallycispositions. Complex (I) is stable up to 360 K, at which point dehydration takes place; the ligands start to decompose at 558 K.

scholarly journals (2,2′-Bipyridine-κ2N,N′)bis(4-formylbenzoato-κO1)copper(II)

2012 ◽  
Vol 68 (8) ◽  
pp. m1062-m1063 ◽  
Author(s):  
Jin-li Qi ◽  
Wei Xu
Keyword(s):  
Hydrogen Bonding ◽  
Rotation Axis ◽  
Planar Geometry ◽  
Carboxylate Group ◽  
Two Dimensional ◽  
Complex Molecules ◽  
Bipy Ligand ◽  
Hydrogen Bonding Interactions ◽  
Carboxylate Groups ◽  
Square Planar

The title mononuclear CuIIcomplex, [Cu(C8H5O3)2(C10H8N2)], is comprised of a CuIIcation, two 4-formylbenzoate (L−) ligands and a 2,2′-bipyridine (bipy) ligand. The CuIIion and bipy ligand lie on a crystallographic twofold rotation axis; the CuIIion is coordinated by two N atoms from one bipy ligand and two O atoms from two different carboxylate groups of twoL−ligands, exhibiting effectively a distorted square-planar geometry. The complex molecules are interlinked to generate two-dimensional supramolecular layers in theabplane, formed by C—H...O hydrogen bonds, where the O acceptor is the O atom from the carboxylate group not involved in coordination to the CuIIion. The two-dimensional layers are stacked in a sequenceviaC—H...O hydrogen-bonding interactions where the formyl O atom acts as acceptor.

scholarly journals N,N,N′-Trimethyl-N′′-(4-nitrophenyl)-N′-phenylguanidine

2014 ◽  
Vol 70 (5) ◽  
pp. o516-o517 ◽  
Author(s):  
Ioannis Tiritiris ◽  
Wolfgang Frey ◽  
Willi Kantlehner
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Phenyl Ring ◽  
Cross Linking ◽  
Planar Geometry ◽  
Two Dimensional ◽  
Single Bond ◽  
Compound C ◽  
Dimensional Network ◽  
Bond Character

The C—N bond lengths in the guanidine unit of the title compound, C16H18N4O2, are 1.298 (2), 1.353 (2) and 1.401 (3) Å, indicating double- and single-bond character. The N—C—N angles are 115.81 (16), 118.90 (18) and 125.16 (18)°, showing a deviation of the CN3plane from an ideal trigonal–planar geometry. In the crystal, C—H...O hydrogen bonds are observed between the methyl- and aromatic-H atoms and nitro-O atoms. One H atom of the phenyl ring and of the NMe2group associate with the O atoms of the nitro group, giving chains along thea-andb-axis directions. Cross-linking of these two chains results in a two-dimensional network alongbc.

scholarly journals Phase diagram of octapod-shaped nanocrystals in a quasi-two-dimensional planar geometry

2013 ◽  
Vol 138 (15) ◽  
pp. 154504 ◽  
Author(s):  
Weikai Qi ◽  
Joost de Graaf ◽  
Fen Qiao ◽  
Sergio Marras ◽  
Liberato Manna ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Planar Geometry ◽  
Two Dimensional

catena-Poly[[[aquasilver(I)]-μ-2,3-dimethylpyrazine-κ2 N:N′] 4-amino-2,5-dichlorobenzenesulfonate]

2007 ◽  
Vol 63 (11) ◽  
pp. m2734-m2735
Author(s):  
Hai-Yan Liu ◽  
Ji-Cheng Ma ◽  
Jin Yang
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chain Structure ◽  
Planar Geometry ◽  
Dimensional Chain ◽  
Two Dimensional ◽  
One Dimensional ◽  
Dimensional Network ◽  
Charge Balancing

In the title compound, {[Ag(C6H8N2)(H2O)](C6H4Cl2NO3S)} n , the AgI ion is three-coordinated by two N atoms from two symmetry-related 2,3-dimethylpyrazine (dmp) ligands, and one water O atom in a distorted trigonal–planar geometry. The dmp ligands bridge AgI ions to form a one-dimensional chain structure with charge-balancing 4-amino-2,5-dichlorobenzenesulfonate anions. In the crystal structure, intermolecular O—H...O and N—H...O hydrogen bonds form a two-dimensional network.

A two-dimensional analysis of mode conversion at a resonance layer with high-magnetic field side reflection

2007 ◽  
Vol 73 (4) ◽  
pp. 473-484
Author(s):  
NORA NASSIRI-MOFAKHAM ◽  
AKBAR PARVAZIAN
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
High Field ◽  
Mode Conversion ◽  
Coupling Parameter ◽  
Local Heating ◽  
Current Drive ◽  
Planar Geometry ◽  
Two Dimensional ◽  
Additional Degree

AbstractMode converted Bernstein waves potentially allow the implementation of local heating and current drive in spherical torus devices, which are not directly accessible to low-harmonic cyclotron waves. The mode conversion method of Cairns and Lashmore-Davies previously used to study the usual mode conversion in non-planar geometry is extended to include the effect of the high-magnetic-field-side cutoff, and is solved analytically. The analytic solutions to the triplet, cutoff–resonance–cutoff, equations give the reflection and conversion coefficients in terms of parameters defining the local behavior of the dispersion relation. The variation of mode conversion efficiency depends not only on the coupling parameter but also on the phasing effect introduced by the high-field-side cutoff. The change in characteristic phases, which are concerned with the coupling parameter, brings an additional degree of freedom allowing optimization via the position of the high-field cutoff. A discrete spectrum of phases exists for which complete mode conversion of the incident wave for a transit of the resonance region can be achieved. The results we obtain here give the general conditions for efficient Bernstein wave heating in two-dimensional geometry.

scholarly journals 2-Dimethylamino-1-(2-ethoxy-2-oxoethyl)-3-methyl-4,5-dihydroimidazolium tetraphenylborate

IUCrData ◽  
2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Ioannis Tiritiris ◽  
Willi Kantlehner
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Positive Charge ◽  
Planar Geometry ◽  
Two Dimensional ◽  
Ethoxy Group ◽  
Double Bond Character ◽  
Bond Lengths ◽  
Phenyl Rings ◽  
Bond Character

In the crystal structure of the title salt, C10H20N3O2+·C24H20B−, the C—N bond lengths in the cation are 1.327 (3), 1.339 (3) and 1.342 (3) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms, indicating only a slight deviation from a trigonal–planar geometry. The positive charge is delocalized in the CN3plane. The ethoxy group is disordered over two orientations, with an occupancy ratio of 0.60 (1):0.40 (1). C—H...π interactions are present between the guanidinium H atoms and the phenyl C atoms of the tetraphenylborate ions. The phenyl rings form aromatic pockets, in which the cations are embedded. This leads to the formation of a two-dimensional supramolecular pattern along theacplane.

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