scholarly journals Donor-Type Nickel–Dithiolene Complexes Fused with Bulky Cycloalkane Substituents and Their Application in Molecular Conductors

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1154
Author(s):  
Kazuya Kubo ◽  
Mamoru Sadahiro ◽  
Sonomi Arata ◽  
Norihisa Hoshino ◽  
Tomofumi Kadoya ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Three Dimensional ◽  
Cation Radical ◽  
Functional Materials ◽  
Molecular Conductors ◽  
Molecular Arrangement ◽  
Singlet States ◽  
Spin Singlet ◽  
Donor Type ◽  
Type Nickel

The effects of substituents on the arrangement of metal–dithiolene complexes based on π-conjugated systems, which are extensively used to synthesize various functional materials, have not been studied adequately. New donor-type nickel–dithiolene complexes fused with bulky cycloalkane substituents [Ni(Cn-dddt)2] (C5-dddt = 4a,5,6,6a-pentahydro-1,4-benzodithiin-2,3-dithiolate; C6-dddt = 4a,5,6,7,8,8a-hexahydro-1,4-benzodithiin-2,3-dithiolate; C7-dddt = 4a,5,6,7,8,9,9a-heptahydro-1,4-benzodithiin-2,3-dithiolate; and C8-dddt = 4a,5,6,7,8,9,10,10a-octahydro-1,4-benzodithiin-2,3-dithiolate) were synthesized in this study. All the complexes were crystallized in cis-[Ni(cis-Cn-dddt)2] conformations with cis-oriented (R,S) conformations around the cycloalkylene groups in the neutral state. Unique molecular arrangements with a three-dimensional network, a one-dimensional column, and a helical molecular arrangement were formed in the crystals owing to the flexible cycloalkane moieties. New 2:1 cation radical crystals of [Ni(C5-dddt)2]2(X) (X = ClO4− or PF6−), obtained by electrochemical crystallization, exhibited semiconducting behaviors (ρrt = 0.8 Ω cm, Ea = 0.09 eV for the ClO4− crystal; 4.0 Ω cm, 0.13 eV for the PF6− crystal) under ambient pressure due to spin-singlet states between the dimers of the donor, which were in accordance with the conducting behaviors under hydrostatic pressure (ρrt = 0.2 Ω cm, Ea = 0.07 eV for the ClO4− crystal; 1.0 Ω cm, 0.12 eV for the PF6− crystal at 2.0 GPa).

Preparation of mesoporous crack-free Sb-SnO2 xerogels through ambient-pressure drying and its application as three-dimensional electrode

2018 ◽  
Vol 86 (2) ◽  
pp. 479-492 ◽  
Author(s):  
Siqi Liu ◽  
Xiezhen Zhou ◽  
Weiqing Han ◽  
Jiansheng Li ◽  
Xiuyun Sun ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Three Dimensional ◽  
Ambient Pressure Drying

Ambient pressure magnetic properties of molecular conductors D[Ni(dmit)2]2 with D = TTF, NMe4 and MHMe3

1991 ◽  
Vol 42 (3) ◽  
pp. 2309
Author(s):  
L. Brossard ◽  
E. Codjovi ◽  
O. Kahn ◽  
L. Valade ◽  
P. Cassoux
Keyword(s):  
Magnetic Properties ◽  
Ambient Pressure ◽  
Molecular Conductors

Magnetic Switching by the In Situ Electrochemical Control of Quasi-Spin-Peierls Singlet States in a Three-Dimensional Spin Lattice Incorporating TTF-TCNQ Salts

2018 ◽  
Vol 24 (17) ◽  
pp. 4294-4303 ◽  
Author(s):  
Hiroki Fukunaga ◽  
Masanori Tonouchi ◽  
Kouji Taniguchi ◽  
Wataru Kosaka ◽  
Shojiro Kimura ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Spin Lattice ◽  
Magnetic Switching ◽  
Singlet States ◽  
Electrochemical Control

Additive Manufacturing of Porous Ceramics with Foaming Agent

2021 ◽  
pp. 1-21
Author(s):  
Zipeng Guo ◽  
Lu An ◽  
Sushil Lakshmanan ◽  
Jason Armstrong ◽  
Shenqiang Ren ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Ambient Pressure ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Cost Effective ◽  
Tensile Tests ◽  
Porous Ceramics ◽  
Foaming Agent ◽  
Printing Quality ◽  
And Control

Abstract The macro-porous ceramics has promising durability and thermal insulation performance. As porous ceramics find more and more applications across many industries, a cost-effective and scalable additive manufacturing technique for fabricating macro-porous ceramics is highly desirable. Herein, we reported a facile additive manufacturing approach to fabricate porous ceramics and control the printed porosity. Several printable ceramic inks were prepared, the foaming agent was added to generate gaseous bubbles in the ink, followed by the direct ink writing and the ambient-pressure and room-temperature drying to create the three-dimensional geometries. A set of experimental studies were performed to optimize the printing quality. The results revealed the optimal process parameters for printing the foamed ceramic ink with a high spatial resolution and fine surface quality. Varying the concentration of the foaming agent enables the controllability of the structural porosity. The maximum porosity can reach 85%, with a crack-free internal porous structure. The tensile tests showed that the printed macro-porous ceramics possessed enhanced durability with the addition of fiber. With a high-fidelity 3D printing process and the precise controllability of the porosity, we showed that the printed samples exhibited a remarkably low thermal conductivity and durable mechanical strength.

Single-component molecular conductor [Pt(dmdt)2]—a three-dimensional ambient-pressure molecular Dirac electron system

2019 ◽  
Vol 55 (23) ◽  
pp. 3327-3330 ◽  
Author(s):  
Biao Zhou ◽  
Shoji Ishibashi ◽  
Tatsuru Ishii ◽  
Takahiko Sekine ◽  
Ryosuke Takehara ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Three Dimensional ◽  
Electron System ◽  
Single Component ◽  
Nodal Lines ◽  
Molecular Conductor ◽  
System P ◽  
Dirac Electron

[Pt(dmdt)2], an air-stable single-component molecular conductor, contains massless Dirac electrons and carries Dirac nodal lines at ambient pressure.

scholarly journals Formation of Three-Dimensional Electronic Networks Using Axially Ligated Metal Phthalocyanines as Stable Neutral Radicals

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 747
Author(s):  
Ryoya Sato ◽  
Masaki Matsuda
Keyword(s):  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Charge Carriers ◽  
Electronic Systems ◽  
Metal Phthalocyanine ◽  
Molecular Conductors ◽  
Metal Phthalocyanines ◽  
X Ray ◽  
Electronic Networks ◽  
Electrical Resistivities

Organic π-radical crystals are potential single-component molecular conductors, as they involve charge carriers. We fabricated new organic π-radical crystals using axially ligated metal phthalocyanine anions ([MIII(Pc)L2]−) as starting materials. Electrochemical oxidation of [MIII(Pc)L2]− afforded single crystals of organic π-radicals of the type MIII(Pc)Cl2·THF (M = Co or Fe, THF = tetrahydrofuran), where the π-conjugated macrocyclic phthalocyanine ligand is one-electron oxidized. The X-ray crystal structure analysis revealed that MIII(Pc)Cl2 formed three-dimensional networks with π-π overlaps. The electrical resistivities of CoIII(Pc)Cl2·THF and FeIII(Pc)Cl2·THF at room temperature along the a-axis were 6 × 102 and 6 × 103 Ω cm, respectively, and were almost isotropic, meaning that MIII(Pc)Cl2·THF had three-dimensional electronic systems.

scholarly journals Ethylene glycol assisted three-dimensional floral evolution of BiFeO 3 -based nanostructures with effective magneto-electric response

2020 ◽  
Vol 7 (8) ◽  
pp. 200642
Author(s):  
Syed Kumail Abbas ◽  
Ghulam M. Mustafa ◽  
Murtaza Saleem ◽  
Muhammad Sufyan ◽  
Saira Riaz ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Functional Materials ◽  
Bias Field ◽  
Memory Storage ◽  
High Coercivity ◽  
Electric Response ◽  
Ferromagnetic Behaviour

Controlled growth of nanostructures plays a vital role in tuning the physical and chemical properties of functional materials for advanced energy and memory storage devices. Herein, we synthesized hierarchical micro-sized flowers, built by the self-assembly of highly crystalline, two-dimensional nanoplates of Co- and Ni-doped BiFeO 3 , using a simple ethylene glycol-mediated solvothermal method. Pure BiFeO 3 attained scattered one-dimensional nanorods-type morphology having diameter nearly 60 nm. Co-doping of Co and Ni at Fe-site in BiFeO 3 does not destabilize the morphology; rather it generates three-dimensional floral patterns of self-assembled nanoplates. Unsaturated polarization loops obtained for BiFeO 3 confirmed the leakage behaviour of these rhombohedrally distorted cubic perovskites. These loops were then used to determine the energy density of the BiFeO 3 perovskites. Enhanced ferromagnetic behaviour with high coercivity and remanence was observed for these nanoplates. A detailed discussion about the origin of ferromagnetic behaviour based on Goodenough–Kanamori's rule is also a part of this paper. Impedance spectroscopy revealed a true Warburg capacitive behaviour of the synthesized nanoplates. High magneto-electric (ME) coefficient of 27 mV cm −1 Oe −1 at a bias field of −0.2 Oe was observed which confirmed the existence of ME coupling in these nanoplates.

scholarly journals Harnessing the interface mechanics of hard films and soft substrates for 3D assembly by controlled buckling

2019 ◽  
Vol 116 (31) ◽  
pp. 15368-15377 ◽  
Author(s):  
Yuan Liu ◽  
Xueju Wang ◽  
Yameng Xu ◽  
Zhaoguo Xue ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Three Dimensional ◽  
Functional Materials ◽  
Loading Path ◽  
Weak Interface ◽  
Nonlinear Buckling ◽  
Micromechanical Resonators ◽  
Diverse Range ◽  
3D Assembly ◽  
Engineering Parameters

Techniques for forming sophisticated, 3D mesostructures in advanced, functional materials are of rapidly growing interest, owing to their potential uses across a broad range of fundamental and applied areas of application. Recently developed approaches to 3D assembly that rely on controlled buckling mechanics serve as versatile routes to 3D mesostructures in a diverse range of high-quality materials and length scales of relevance for 3D microsystems with unusual function and/or enhanced performance. Nonlinear buckling and delamination behaviors in materials that combine both weak and strong interfaces are foundational to the assembly process, but they can be difficult to control, especially for complex geometries. This paper presents theoretical and experimental studies of the fundamental aspects of adhesion and delamination in this context. By quantifying the effects of various essential parameters on these processes, we establish general design diagrams for different material systems, taking into account 4 dominant delamination states (wrinkling, partial delamination of the weak interface, full delamination of the weak interface, and partial delamination of the strong interface). These diagrams provide guidelines for the selection of engineering parameters that avoid interface-related failure, as demonstrated by a series of examples in 3D helical mesostructures and mesostructures that are reconfigurable based on the control of loading-path trajectories. Three-dimensional micromechanical resonators with frequencies that can be selected between 2 distinct values serve as demonstrative examples.

scholarly journals Tunable structural color of bottlebrush block copolymers through direct-write 3D printing from solution

2020 ◽  
Vol 6 (24) ◽  
pp. eaaz7202 ◽  
Author(s):  
Bijal B. Patel ◽  
Dylan J. Walsh ◽  
Do Hoon Kim ◽  
Justin Kwok ◽  
Byeongdu Lee ◽  
...  
Keyword(s):  
3D Printing ◽  
Self Assembly ◽  
Three Dimensional ◽  
Size Control ◽  
Functional Materials ◽  
Domain Size ◽  
Direct Write ◽  
Processing Scheme ◽  
Solvent Vapor ◽  
Robust Processing

Additive manufacturing of functional materials is limited by control of microstructure and assembly at the nanoscale. In this work, we integrate nonequilibrium self-assembly with direct-write three-dimensional (3D) printing to prepare bottlebrush block copolymer (BBCP) photonic crystals (PCs) with tunable structure color. After varying deposition conditions during printing of a single ink solution, peak reflected wavelength for BBCP PCs span a range of 403 to 626 nm (blue to red), corresponding to an estimated change in d-spacing of >70 nm (Bragg- Snell equation). Physical characterization confirms that these vivid optical effects are underpinned by tuning of lamellar domain spacing, which we attribute to modulation of polymer conformation. Using in situ optical microscopy and solvent-vapor annealing, we identify kinetic trapping of metastable microstructures during printing as the mechanism for domain size control. More generally, we present a robust processing scheme with potential for on-the-fly property tuning of a variety of functional materials.

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