C-H…N≡C Hydrogen Bonding in Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Compounds

CrystEngComm ◽  
2022 ◽  
Author(s):  
Sandra Rabaça ◽  
Isabel Cordeiro Santos ◽  
Gonçalo Lopes ◽  
Vasco Pires Silva da Gama ◽  
Luis Filipe F. Veiros ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Engineering ◽  
Two Dimensional ◽  
Conducting Materials ◽  
New Type

The importance of the C-H…N≡C interactions in the crystal engineering of conducting materials was recently put into evidence in a new type of two-dimensional conducting materials with composition (5-CNB-EDT-TTF)4A with...

Crystal Engineering Using Tris-phenols. Cross-Linked, Pairwise-Interwoven Two-Dimensional Nets in the 2:1 Adduct of 1,1,1-Tris(4-hydroxyphenyl)ethane with 1,2-Diaminoethane

1998 ◽  
Vol 54 (3) ◽  
pp. 330-338 ◽  
Author(s):  
G. Ferguson ◽  
C. Glidewell ◽  
R. M. Gregson ◽  
P. R. Meehan
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystal Engineering ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Site Occupation

In 1,1,1-tris(4-hydroxyphenyl)ethane–1,2-diaminoethane (2/1), [CH3C(C6H4OH)3]2.H2NCH2CH2NH2 (1), triclinic, P1¯, with Z = 2, a = 10.9430 (12), b = 11.1075 (12), c = 15.249 (2) Å, α = 98.672 (15), β = 96.312 (10), γ = 98.377 (13)°, the tris-phenol units form continuous two-dimensional nets, built from pseudo-hexagonal R^4_4(38) rings, interwoven pairs of which are cross-linked by the 1,2-diaminoethane units. Each tris-phenol unit acts as a triple donor, forming two O—H...O and one O—H...N hydrogen bonds, and as a double acceptor in two O—H...O hydrogen bonds: the diamine unit, in which the CH2 groups are disordered over two sets of sites with site-occupation factors of 0.740 (5) and 0.260 (5), respectively, acts as a double acceptor only and the N—H bonds play no role in the hydrogen bonding. The O...O distances in the O—H...O hydrogen bonds are 2.642 (2), 2.690 (2), 2.810 (2) and 2.835 (2) Å, and the two independent O...N distances are both 2.665 (3) Å. Adjacent bilayers are connected into a continuous three-dimensional array by C—H...O hydrogen bonds, all having a C...O distance of 3.468 (4) Å.

“Crystal Engineering” with Two-Dimensional Hydrogen Bonding Networks

1999 ◽  
pp. 133-144
Author(s):  
J. A. Swift ◽  
A. M. Pivovar ◽  
A. M. Reynolds ◽  
C. C. Evans ◽  
V. A. Russell ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Engineering ◽  
Two Dimensional ◽  
Hydrogen Bonding Networks

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

Concomitant polymorphs of 1,3-bis(3-fluorophenyl)urea

2016 ◽  
Vol 72 (9) ◽  
pp. 692-696 ◽  
Author(s):  
Christina A. Capacci-Daniel ◽  
Jeffery A. Bertke ◽  
Shoaleh Dehghan ◽  
Rupa Hiremath-Darji ◽  
Jennifer A. Swift
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Engineering ◽  
Structural Motif ◽  
Parallel Orientation ◽  
One Dimensional ◽  
Monoclinic Form ◽  
Engineering Studies ◽  
Hydrogen Bonded

Hydrogen bonding between urea functionalities is a common structural motif employed in crystal-engineering studies. Crystallization of 1,3-bis(3-fluorophenyl)urea, C13H10F2N2O, from many solvents yielded concomitant mixtures of at least two polymorphs. In the monoclinic form, one-dimensional chains of hydrogen-bonded urea molecules align in an antiparallel orientation, as is typical of many diphenylureas. In the orthorhombic form, one-dimensional chains of hydrogen-bonded urea molecules have a parallel orientation rarely observed in symmetrically substituted diphenylureas.

scholarly journals Novel Two-Dimensional Layered MoSi2Z4 (Z = P, As): New Promising Optoelectronic Materials

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 559
Author(s):  
Hui Yao ◽  
Chao Zhang ◽  
Qiang Wang ◽  
Jianwei Li ◽  
Yunjin Yu ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Incident Light ◽  
Optoelectronic Devices ◽  
Large Family ◽  
Middle Layer ◽  
Optoelectronic Device ◽  
First Principles Calculation ◽  
Polarization Angle ◽  
Two Dimensional ◽  
Conducting Materials

Very recently, two new two-dimensional (2D) layered semi-conducting materials MoSi2N4 and WSi2N4 were successfully synthesized in experiments, and a large family of these two 2D materials, namely MA2Z4, was also predicted theoretically (Science, 369, 670 (2020)). Motivated by this exciting family, in this work, we systematically investigate the mechanical, electronic and optical properties of monolayer and bilayer MoSi2P4 and MoSi2As4 by using the first-principles calculation method. Numerical results indicate that both monolayer and bilayer MoSi2Z4 (Z = P, As) present good structural stability, isotropic mechanical parameters, moderate bandgap, favorable carrier mobilities, remarkable optical absorption, superior photon responsivity and external quantum efficiency. Especially, due to the wave-functions of band edges dominated by d orbital of the middle-layer Mo atoms are screened effectively, the bandgap and optical absorption hardly depend on the number of layers, providing an added convenience in the experimental fabrication of few-layer MoSi2Z4-based electronic and optoelectronic devices. We also build a monolayer MoSi2Z4-based 2D optoelectronic device, and quantitatively evaluate the photocurrent as a function of energy and polarization angle of the incident light. Our investigation verifies the excellent performance of a few-layer MoSi2Z4 and expands their potential application in nanoscale electronic and optoelectronic devices.

Ferroelectric Liquid Crystal Light Valve Using SiO2 / A-Si:H Photodiode

1991 ◽  
Vol 219 ◽  
Author(s):  
T. Horikawa ◽  
S. Tahata ◽  
S. Kaho ◽  
T. Masumi ◽  
N. Mikami ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Dark Conductivity ◽  
Ferroelectric Liquid Crystal ◽  
Two Dimensional ◽  
Metal Insulator ◽  
Resolution Capability ◽  
New Type ◽  
Light Valve ◽  
Mis Diode ◽  
High Photosensitivity

ABSTRACTA new type of ferroelectric liquid crystal light valve (FLCLV) is presented. The design of the FLCLV is based upon the linear equivalent circuit analyses. A photosensor in the FLCLV consists of a metal-insulator-semiconductor (MIS) photodiode. A-Si:H doped with boron and nitrogen [a-Si:(:N:B)] is used in the MIS diode. The a-Si:H(:B:N) film has a dark-conductivity of less than 1×1012 S/cm and a high photosensitivity.Consequently, the writing characteristics of the FLCLV for a two dimensional (2D) image are evaluated. Using writing light of 630 nm and 1 mW/cm2, a high resolution capability of 120∼140 1p/mm is obtained.

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