Phosphinocarboxylic acids as building blocks in organometallic crystal engineering. Self-organisation of one-dimensional photoluminescent cyclometallated platinum(ii) polymeric structures

1998 ◽  
pp. 2295-2296 ◽  
Author(s):  
Man-Chung Tse ◽  
Kung-Kai Cheung ◽  
Michael C.-W. Chan ◽  
Chi-Ming Che
Keyword(s):  
Crystal Engineering ◽  
Building Blocks ◽  
One Dimensional ◽  
Self Organisation ◽  
Polymeric Structures

scholarly journals Organoplatinum Building Blocks for One-Dimensional Hydrogen-Bonded Polymeric Structures

1996 ◽  
Vol 35 (17) ◽  
pp. 1959-1961 ◽  
Author(s):  
Philip J. Davies ◽  
David M. Grove ◽  
Gerard van Koten ◽  
Nora Veldman ◽  
Anthony L. Spek ◽  
...  
Keyword(s):  
Building Blocks ◽  
One Dimensional ◽  
Polymeric Structures ◽  
Hydrogen Bonded

Axially Chiral Bis(α-amino Acid)s and Their Deamino Analogues. Synthesis and Configurational Assignment

1998 ◽  
Vol 63 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Miloš Tichý ◽  
Luděk Ridvan ◽  
Miloš Buděšínský ◽  
Jiří Závada ◽  
Jaroslav Podlaha ◽  
...  
Keyword(s):  
Amino Acid ◽  
Nmr Spectra ◽  
Building Blocks ◽  
X Ray Diffraction ◽  
Amino Groups ◽  
X Ray ◽  
Configurational Assignment ◽  
Symmetry Properties ◽  
Axially Chiral ◽  
Polymeric Structures

The axially chiral bis(α-amino acid)s cis-2 and trans-2 as possible building blocks for polymeric structures of novel type of helicity were prepared. Their configuration has been determined by NMR spectroscopy and, in the case of the trans-isomer, confirmed by single-crystal X-ray diffraction. Analogous pair of stereoisomeric diacids cis-3 and trans-3, devoid of the amino groups, was also prepared and their configuration assigned. The observed differences in the NMR spectra of cis- and trans-isomers of 2 and 3 are discussed from the viewpoint of their different symmetry properties.

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.

Hierarchy of Supramolecular Arrangements and Building Blocks: Inverted Paradigm of Crystal Engineering in the Unprecedented Metal Coordination of Methylene Blue

2017 ◽  
Vol 56 (6) ◽  
pp. 3512-3516 ◽  
Author(s):  
Stefano Canossa ◽  
Alessia Bacchi ◽  
Claudia Graiff ◽  
Paolo Pelagatti ◽  
Giovanni Predieri ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Crystal Engineering ◽  
Building Blocks ◽  
Metal Coordination ◽  
Supramolecular Arrangements

Shape memory alloy–actuated prestressed composites with application to morphing automotive fender skirts

2018 ◽  
Vol 30 (3) ◽  
pp. 479-494 ◽  
Author(s):  
Venkata Siva C Chillara ◽  
Leon M Headings ◽  
Ryohei Tsuruta ◽  
Eiji Itakura ◽  
Umesh Gandhi ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Smart Materials ◽  
Design Procedure ◽  
Building Blocks ◽  
Smart Composite ◽  
Thermally Induced ◽  
One Dimensional ◽  
Flat Shape

This work presents smart laminated composites that enable morphing vehicle structures. Morphing panels can be effective for drag reduction, for example, adaptive fender skirts. Mechanical prestress provides tailored curvature in composites without the drawbacks of thermally induced residual stress. When driven by smart materials such as shape memory alloys, mechanically-prestressed composites can serve as building blocks for morphing structures. An analytical energy-based model is presented to calculate the curved shape of a composite as a function of force applied by an embedded actuator. Shape transition is modeled by providing the actuation force as an input to a one-dimensional thermomechanical constitutive model of a shape memory alloy wire. A design procedure, based on the analytical model, is presented for morphing fender skirts comprising radially configured smart composite elements. A half-scale fender skirt for a compact passenger car is designed, fabricated, and tested. The demonstrator has a domed unactuated shape and morphs to a flat shape when actuated using shape memory alloys. Rapid actuation is demonstrated by coupling shape memory alloys with integrated quick-release latches; the latches reduce actuation time by 95%. The demonstrator is 62% lighter than an equivalent dome-shaped steel fender skirt.

scholarly journals Is the Responsibility to Protect an Accepted Norm of International Law in the post-Libya Era?

2018 ◽  
pp. 11
Author(s):  
Jeremy Sarkin
Keyword(s):  
Human Rights ◽  
International Law ◽  
Transitional Justice ◽  
Building Blocks ◽  
Responsibility To Protect ◽  
Human Rights Violations ◽  
One Dimensional

This article explores the Responsibility to Protect (RtoP) in the post-Libya era to determinewhether it is now an accepted norm of international law. It examines what RtoP means intoday`s world and whether the norm now means that steps will be taken against states thatare committing serious human rights violations. The building blocks of RtoP are examined tosee how to make the doctrine more relevant and more applicable. It is contended that theresponsibility to react should be viewed through a much wider lens and that it needs to bemore widely interpreted to allow it to gain greater support. It is argued that there is a need tofocus far more on the responsibility to rebuild and that it ought to focus on the transitionallegal architecture as well as transitional justice. It is contended that these processes ought notto be one-dimensional, but ought to have a variety of constituent parts. It is further arguedthat the international and donor community ought to be far more engaged and far moredirective in these projects.

scholarly journals Straightforward Preparation of Supramolecular Janus Nanorods by Hydrogen Bonding of End-Functionalized Polymers

2020 ◽  
Author(s):  
Shuaiyuan Han ◽  
Sandrine Pensec ◽  
Cédric Lorthioir ◽  
Jacques Jestin ◽  
Jean-Michel Guigner ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Functional Materials ◽  
Phase Segregation ◽  
Building Blocks ◽  
Functionalized Polymers ◽  
Nanometer Range ◽  
One Dimensional ◽  
Oil In Water ◽  
First Time

Janus cylinders are one-dimensional colloids that have two faces with different compositions and functionalities and are useful as building blocks for advanced functional materials. Such anisotropic objects are difficult to prepare with nanometric dimensions. Here we describe a robust and versatile strategy to form micrometer long Janus nanorods with diameters in the 10-nanometer range, by self-assembly in water of end-functionalized polymers. For the first time, the Janus topology is not a result of the phase segregation of incompatible polymer arms, but is driven by the interactions between unsymmetrical and complementary hydrogen bonded stickers. It is therefore independent of the actual polymers used and works even for compatible polymers. To illustrate their applicative potential, we show that these Janus nanorods can efficiently stabilize oil-in-water emulsions.

A threefold interpenetrated two-dimensional zinc(II) supramolecular architecture based on 3-nitrobenzoic acid and 4,4′-bipyridine

2016 ◽  
Vol 72 (2) ◽  
pp. 128-132 ◽  
Author(s):  
Long Tang ◽  
Ji-Jiang Wang ◽  
Feng Fu ◽  
Sheng-Wen Wang ◽  
Qi-Rui Liu
Keyword(s):  
Coordination Polymers ◽  
Crystal Engineering ◽  
Critical Factor ◽  
Building Blocks ◽  
Zigzag Chain ◽  
Great Success ◽  
Supramolecular Architecture ◽  
Two Dimensional ◽  
Hydrothermal Conditions ◽  
Nitrobenzoic Acid

With regard to crystal engineering, building block or modular assembly methodologies have shown great success in the design and construction of metal–organic coordination polymers. The critical factor for the construction of coordination polymers is the rational choice of the organic building blocks and the metal centre. The reaction of Zn(OAc)2·2H2O (OAc is acetate) with 3-nitrobenzoic acid (HNBA) and 4,4′-bipyridine (4,4′-bipy) under hydrothermal conditions produced a two-dimensional zinc(II) supramolecular architecture,catena-poly[[bis(3-nitrobenzoato-κ2O,O′)zinc(II)]-μ-4,4′-bipyridine-κ2N:N′], [Zn(C7H4NO4)2(C10H8N2)]nor [Zn(NBA)2(4,4′-bipy)]n, which was characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction analysis. The ZnIIions are connected by the 4,4′-bipy ligands to form a one-dimensional zigzag chain and the chains are decorated with anionic NBA ligands which interact further through aromatic π–π stacking interactions, expanding the structure into a threefold interpenetrated two-dimensional supramolecular architecture. The solid-state fluorescence analysis indicates a slight blue shift compared with pure 4,4′-bipyridine and HNBA.

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