scholarly journals Bulky End‐Capped [1]Benzothieno[3,2‐ b ]benzothiophenes: Reaching High‐Mobility Organic Semiconductors by Fine Tuning of the Crystalline Solid‐State Order

2015 ◽  
Vol 27 (19) ◽  
pp. 3066-3072 ◽  
Author(s):  
Guillaume Schweicher ◽  
Vincent Lemaur ◽  
Claude Niebel ◽  
Christian Ruzié ◽  
Ying Diao ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
High Mobility ◽  
Fine Tuning ◽  
Crystalline Solid

scholarly journals Mesomorphic Behavior in Silver(I) N-(4-Pyridyl) Benzamide with Aromatic π–π Stacking Counterions

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1666 ◽  
Author(s):  
Issac Torres ◽  
Mauro Ruiz ◽  
Hung Phan ◽  
Noemi Dominguez ◽  
Jacobo Garcia ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
Flexible Electronics ◽  
Crystalline Solid ◽  
Naval Research ◽  
Scanning Calorimetry ◽  
New Family ◽  
Π Stacking ◽  
Capable Groups ◽  
New Generation

Organic semiconductor materials composed of π–π stacking aromatic compounds have been under intense investigation for their potential uses in flexible electronics and other advanced technologies. Herein we report a new family of seven π–π stacking compounds of silver(I) bis-N-(4-pyridyl) benzamide with varying counterions, namely [Ag(NPBA)2]X, where NPBA is N-(4-pyridyl) benzamine, X = NO3− (1), ClO4− (2), CF3SO3− (3), PF6− (4), BF4− (5), CH3PhSO3− (6), and PhSO3− (7), which form extended π−π stacking networks in one-dimensional (1D), 2D and 3D directions in the crystalline solid-state via the phenyl moiety, with average inter-ring distances of 3.823 Å. Interestingly, the counterions that contain π–π stacking-capable groups, such as in 6 and 7, can induce the formation of mesomorphic phases at 130 °C in dimethylformamide (DMF), and can generate highly branched networks at the mesoscale. Atomic force microscopy studies showed that 2D interconnected fibers form right after nucleation, and they extend from ~30 nm in diameter grow to reach the micron scale, which suggests that it may be possible to stop the process in order to obtain nanofibers. Differential scanning calorimetry studies showed no remarkable thermal behavior in the complexes in the solid state, which suggests that the mesomorphic phases originate from the mechanisms that occur in the DMF solution at high temperatures. An all-electron level simulation of the band gaps using NRLMOL (Naval Research Laboratory Molecular Research Library) on the crystals gave 3.25 eV for (1), 3.68 eV for (2), 1.48 eV for (3), 5.08 eV for (4), 1.53 eV for (5), and 3.55 eV for (6). Mesomorphic behavior in materials containing π–π stacking aromatic interactions that also exhibit low-band gap properties may pave the way to a new generation of highly branched organic semiconductors.

scholarly journals High-mobility semiconducting polymers with different spin ground states

2021 ◽  
Author(s):  
Xiao-Xiang Chen ◽  
Jia-Tong Li ◽  
Yu-Hui Fang ◽  
Xue-Qing Wang ◽  
Guangchao Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
High Spin ◽  
Ground State ◽  
Ground States ◽  
High Mobility ◽  
Building Blocks ◽  
Design Strategy ◽  
Semiconducting Polymers ◽  
Related Phenomenon

Abstract Organic semiconductors with high-spin ground states are fascinating because they could enable fundamental understanding on spin-related phenomenon in light element and provide opportunities for organic magnetic and quantum materials. Although high-spin ground states have been observed in some quinoidal type small molecules or doped organic semiconductors, semiconducting polymers with high-spin at its neutral ground state are rarely reported because of the less of clear design strategy. Here we propose a molecular design strategy to obtain high-mobility semiconducting polymers with different spin ground states. We show that polymer building blocks with small singlet-triplet energy gap (ΔES−T) could enable small ΔES−T gap and increase the diradical character in copolymers. We first demonstrate that the spin density and solid-state interchain interactions in the high-spin polymers are crucial for their ground states. Polymers with a triplet ground state (S = 1) could exhibit doublet (S = 1/2) behavior due to the solid-state interchain spin-spin interactions. Besides, these polymers showed outstanding charge transport properties with high hole/electron mobilities and can be both n- and p-doped with superior conductivities. Our results demonstrate a rational design approach to high-mobility semiconducting polymers with different spin ground states.

Toward Highly Robust Nonvolatile Multilevel Memory by Fine Tuning of the Nanostructural Crystalline Solid‐State Order

Small ◽  
2021 ◽  
pp. 2100102
Author(s):  
Yang Li ◽  
Cheng Zhang ◽  
Songtao Ling ◽  
Chunlan Ma ◽  
Jinlei Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Fine Tuning ◽  
Crystalline Solid ◽  
Multilevel Memory

Wide electrochemical window ionic salt for use in electropositive metal electrodeposition and solid state Li-ion batteries

2014 ◽  
Vol 2 (7) ◽  
pp. 2194-2201 ◽  
Author(s):  
Sankaran Murugesan ◽  
Oliver A. Quintero ◽  
Brendan P. Chou ◽  
Penghao Xiao ◽  
Kyusung Park ◽  
...  
Keyword(s):  
Solid State ◽  
Crystalline Solid ◽  
Li Ion Batteries ◽  
Ionic Salt ◽  
Metal Electrodeposition ◽  
Electrochemical Window ◽  
Li Ion

A stable hydrophobic ionic crystalline solid comprised of the N-propyl-N-methylpiperidinium cation and hexafluorophosphate anion PP13PF6 exhibits a remarkably wide electrochemical window of 7.2 V.

scholarly journals Resistive-pulse and rectification sensing with glass and carbon nanopipettes

2017 ◽  
Vol 473 (2199) ◽  
pp. 20160931 ◽  
Author(s):  
Yixian Wang ◽  
Dengchao Wang ◽  
Michael V. Mirkin
Keyword(s):  
Solid State ◽  
Carbon Layer ◽  
Fine Tuning ◽  
Physical Size ◽  
Resistive Pulse ◽  
Thin Carbon ◽  
Local Measurements ◽  
Electroactive Species ◽  
Current Rectification ◽  
Resistive Pulse Sensing

Along with more prevalent solid-state nanopores, glass or quartz nanopipettes have found applications in resistive-pulse and rectification sensing. Their advantages include the ease of fabrication, small physical size and needle-like geometry, rendering them useful for local measurements in small spaces and delivery of nanoparticles/biomolecules. Carbon nanopipettes fabricated by depositing a thin carbon layer on the inner wall of a quartz pipette provide additional means for detecting electroactive species and fine-tuning the current rectification properties. In this paper, we discuss the fundamentals of resistive-pulse sensing with nanopipettes and our recent studies of current rectification in carbon pipettes.

Protein structure by solid-state NMR spectroscopy

1987 ◽  
Vol 19 (1-2) ◽  
pp. 7-49 ◽  
Author(s):  
S. J. Opella ◽  
P. L. Stewart ◽  
K. G. Valentine
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Structural Information ◽  
Biological Systems ◽  
Genetic Regulation ◽  
Protein Structures ◽  
Crystalline Solid ◽  
Solid State Nmr Spectroscopy ◽  
Nmr Methods

The three-dimensional structures of proteins are among the most valuable contributions of biophysics to the understanding of biological systems (Dickerson & Geis, 1969; Creighton, 1983). Protein structures are utilized in the description and interpretation of a wide variety of biological phenomena, including genetic regulation, enzyme mechanisms, antibody recognition, cellular energetics, and macroscopic mechanical and structural properties of molecular assemblies. Virtually all of the information currently available about the structures of proteins at atomic resolution has been obtained from diffraction studies of single crystals of proteins (Wyckoff et al, 1985). However, recently developed NMR methods are capable of determining the structures of proteins and are now being applied to a variety of systems, including proteins in solution and other non-crystalline environments that are not amenable for X-ray diffraction studies. Solid-state NMR methods are useful for proteins that undergo limited overall reorientation by virtue of their being in the crystalline solid state or integral parts of supramolecular structures that do not reorient rapidly in solution. For reviews of applications of solid-state NMR spectroscopy to biological systems see Torchia and VanderHart (1979), Griffin (1981), Oldfield et al. (1982), Opella (1982), Torchia (1982), Gauesh (1984), Torchia (1984) and Opella (1986). This review describes how solid-state NMR can be used to obtain structural information about proteins. Methods applicable to samples with macroscopic orientation are emphasized.

scholarly journals Novel Riboflavin-Inspired Conjugated Bio-Organic Semiconductors

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2271 ◽  
Author(s):  
Jan Richtar ◽  
Patricie Heinrichova ◽  
Dogukan Apaydin ◽  
Veronika Schmiedova ◽  
Cigdem Yumusak ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Organic Semiconductors ◽  
Intramolecular Proton Transfer ◽  
Fine Tuning ◽  
Conjugated Materials ◽  
Absorption And Emission ◽  
Application Potential ◽  
Synthetic Approaches ◽  
Comprehensive Characterization

Flavins are known to be extremely versatile, thus enabling routes to innumerable modifications in order to obtain desired properties. Thus, in the present paper, the group of bio-inspired conjugated materials based on the alloxazine core is synthetized using two efficient novel synthetic approaches providing relatively high reaction yields. The comprehensive characterization of the materials, in order to evaluate the properties and application potential, has shown that the modification of the initial alloxazine core with aromatic substituents allows fine tuning of the optical bandgap, position of electronic orbitals, absorption and emission properties. Interestingly, the compounds possess multichromophoric behavior, which is assumed to be the results of an intramolecular proton transfer.

scholarly journals Different BCS Class II Drug-Gelucire Solid Dispersions Prepared by Spray Congealing: Evaluation of Solid State Properties and In Vitro Performances

Pharmaceutics ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 548 ◽  
Author(s):  
Serena Bertoni ◽  
Beatrice Albertini ◽  
Nadia Passerini
Keyword(s):  
Solid State ◽  
Drug Carrier ◽  
Solid Dispersions ◽  
Class Ii ◽  
Water Soluble ◽  
Drug Dissolution ◽  
Crystalline Solid ◽  
Dissolution Behavior ◽  
Bcs Class Ii

Delivery of poorly water soluble active pharmaceutical ingredients (APIs) by semi-crystalline solid dispersions prepared by spray congealing in form of microparticles (MPs) is an emerging method to increase their oral bioavailability. In this study, solid dispersions based on hydrophilic Gelucires® (Gelucire® 50/13 and Gelucire® 48/16 in different ratio) of three BCS class II model compounds (carbamazepine, CBZ, tolbutamide, TBM, and cinnarizine, CIN) having different physicochemical properties (logP, pKa, Tm) were produced by spray congealing process. The obtained MPs were investigated in terms of morphology, particles size, drug content, solid state properties, drug-carrier interactions, solubility, and dissolution performances. The solid-state characterization showed that the properties of the incorporated drug had a profound influence on the structure of the obtained solid dispersion: CBZ recrystallized in a different polymorphic form, TBM crystallinity was significantly reduced as a result of specific interactions with the carrier, while smaller crystals were observed in case of CIN. The in vitro tests suggested that the drug solubility was mainly influenced by carrier composition, while the drug dissolution behavior was affected by the API solid state in the MPs after the spray congealing process. Among the tested APIs, TBM-Gelucire dispersions showed the highest enhancement in drug dissolution as a result of the reduced drug crystallinity.

Sign in / Sign up

Export Citation Format

Share Document