New Class of Phosphine Oxide Donor-Based Supramolecular Coordination Complexes from an in Situ Phosphine Oxidation Reaction or Phosphine Oxide Ligands

2013 ◽  
Vol 52 (18) ◽  
pp. 10217-10219 ◽  
Author(s):  
Bhaskaran Shankar ◽  
Palani Elumalai ◽  
Ramasamy Shanmugam ◽  
Virender Singh ◽  
Dhanraj T. Masram ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Oxidation Reaction ◽  
Coordination Complexes ◽  
New Class ◽  
Supramolecular Coordination

scholarly journals Doubling the Carbonate-Binding Capacity of Nanojars by the Formation of Expanded Nanojars

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3083
Author(s):  
Wisam A. Al Isawi ◽  
Gellert Mezei
Keyword(s):  
Co2 Fixation ◽  
Binding Capacity ◽  
Coordination Complexes ◽  
Anion Binding ◽  
Ionization Mass ◽  
X Ray ◽  
Carbonate Ion ◽  
Carbonate Ions ◽  
Supramolecular Coordination ◽  
Hydration Energies

Anion binding and extraction from solutions is currently a dynamic research topic in the field of supramolecular chemistry. A particularly challenging task is the extraction of anions with large hydration energies, such as the carbonate ion. Carbonate-binding complexes are also receiving increased interest due to their relevance to atmospheric CO2 fixation. Nanojars are a class of self-assembled, supramolecular coordination complexes that have been shown to bind highly hydrophilic anions and to extract even the most hydrophilic ones, including carbonate, from water into aliphatic solvents. Here we present an expanded nanojar that is able to bind two carbonate ions, thus doubling the previously reported carbonate-binding capacity of nanojars. The new nanojar is characterized by detailed single-crystal X-ray crystallographic studies in the solid state and electrospray ionization mass spectrometric (including tandem MS/MS) studies in solution.

A Molecular Artisans Guide to Supramolecular Coordination Complexes and Metal Organic Frameworks

2015 ◽  
Vol 03 (01n02) ◽  
pp. 1540004 ◽  
Author(s):  
Xialu Wu ◽  
David J. Young ◽  
T. S. Andy Hor
Keyword(s):  
Chemical Reactivity ◽  
Metal Organic Frameworks ◽  
Building Blocks ◽  
Coordination Complexes ◽  
Large Molecules ◽  
Molecular Building Blocks ◽  
Supramolecular Coordination ◽  
Metal Organic ◽  
Molecular Synthesis ◽  
And Function

As molecular synthesis advances, we are beginning to learn control of not only the chemical reactivity (and function) of molecules, but also of their interactions with other molecules. It is this basic idea that has led to the current explosion of supramolecular science and engineering. Parallel to this development, chemists have been actively pursuing the design of very large molecules using basic molecular building blocks. Herein, we review the general development of supramolecular chemistry and particularly of two new branches: supramolecular coordination complexes (SCCs) and metal organic frameworks (MOFs). These two fields are discussed in detail with typical examples to illustrate what is now possible and what challenges lie ahead for tomorrow's molecular artisans.

In Situ Phosphine Oxide Reduction: A Catalytic Appel Reaction

2011 ◽  
Vol 17 (40) ◽  
pp. 11290-11295 ◽  
Author(s):  
Henri A. van Kalkeren ◽  
Stefan H. A. M. Leenders ◽  
C. Rianne A. Hommersom ◽  
Floris P. J. T. Rutjes ◽  
Floris L. van Delft
Keyword(s):  
Phosphine Oxide ◽  
Oxide Reduction

scholarly journals Facile Synthesis of Pd@PtM (M = Rh, Ni, Pd, Cu) Multimetallic Nanorings as Efficient Catalysts for Ethanol Oxidation Reaction

2021 ◽  
Vol 9 ◽  
Author(s):  
Xingqiao Wu ◽  
Xiao Li ◽  
Yucong Yan ◽  
Sai Luo ◽  
Jingbo Huang ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Epitaxial Growth ◽  
Oxidation Reaction ◽  
Ethanol Oxidation ◽  
Hollow Structure ◽  
Ethanol Oxidation Reaction ◽  
Hollow Nanostructures ◽  
Oxidative Etching ◽  
General Method

Pt-based multimetallic nanorings with a hollow structure are attractive as advanced catalysts due to their fantastic structure feature. However, the general method for the synthesis of such unique nanostructures is still lack. Here we report the synthesis of Pd@PtM (M = Rh, Ni, Pd, Cu) multimetallic nanorings by selective epitaxial growth of Pt alloyed shells on the periphery of Pd nanoplates in combination with oxidative etching of partial Pd in the interior. In situ generation of CO and benzoic acid arising from interfacial catalytic reactions between Pd nanoplates and benzaldehyde are critical to achieve high-quality Pt-based multimetallic nanorings. Specifically, the in-situ generated CO promotes the formation of Pt alloyed shells and their epitaxial growth on Pd nanoplates. In addition, the as-formed benzoic acid and residual oxygen are responsible for selective oxidative etching of partial Pd in the interior. When evaluated as electrocatalysts, the Pd@PtRh nanorings exhibit remarkably enhanced activity and stability for ethanol oxidation reaction (EOR) compared to the Pd@PtRh nanoplates and commercial Pt/C due to their hollow nanostructures.

scholarly journals Phase Transitions in Borohydride Perovskites

2014 ◽  
Vol 70 (a1) ◽  
pp. C73-C73
Author(s):  
Pascal Schouwink ◽  
Radovan Cerny
Keyword(s):  
Phase Transitions ◽  
Volume Expansion ◽  
Host Lattice ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
New Class ◽  
Structural Distortions ◽  
Complex Hydrides ◽  
Type Lattice

A series of complex hydrides based on the highly dynamic tetrahydroborate anion BH4-and crystallizing in theABX3type lattice has recently been discovered. They present a rare case of a family of iono-covalent hydrides that has a genuine tunable host lattice, making them an interesting new class of host compounds for not only the design of hydrogen storage materials but also hydride-properties related to heavy metals. Amongst these, preliminary results onREE-based luminescence will be discussed in the neat and doped compounds, the Ln2+excited states surprisingly not being subject to significant quenching by B-H vibrations. Unlike oxide- or halide-perovskites some members of theAB(BH4)3group do not evolve to higher symmetries as a function of temperature. We show by means ofin-situsynchrotron X-ray powder diffraction, vibrational spectroscopy andab initiocalculations in the solid state, that temperature-induced structural distortions in perovskite-typeACa(BH4)3(A= K, Rb, Cs) have their origin in close hydridic di-hydrogen contacts of repulsive nature. Coupling between internal B-H vibrations and phonons results in lattice distortions that are identical in symmetry to well-known instabilities (soft modes) in perovskites, which generally condense to lower temperatures. Anion-substitution BH4-<->X-(X= Halide) calculated on ordered models can relax distortions caused by repulsive effects. High temperature phase-transitions inACa(BH4)3can be of first or second-order, including 2-fold superlattices, simple cubic-cubic transitions accompanied by volume expansion or complex modulated superstructures accompanied by negative volume expansion, as is the case in RbCa(BH4)3. Close di-hydrogen contacts may be suggested as a tool to tailor the crystal symmetry in complex hydride perovskites in the future.

In situ intercalative polymerization of pyrrole in Fe0Cl: a new class of layered, conducting polymer-inorganic hybrid materials

1987 ◽  
Vol 109 (12) ◽  
pp. 3797-3799 ◽  
Author(s):  
M. G. Kanatzidis ◽  
L. M. Tonge ◽  
T. J. Marks ◽  
H. O. Marcy ◽  
C. R. Kannewurf
Keyword(s):  
Conducting Polymer ◽  
Hybrid Materials ◽  
Inorganic Hybrid ◽  
New Class ◽  
Intercalative Polymerization

Liquid coordination complexes: a new class of Lewis acids as safer alternatives to BF3 in synthesis of polyalphaolefins

2015 ◽  
Vol 17 (3) ◽  
pp. 1831-1841 ◽  
Author(s):  
James M. Hogg ◽  
Fergal Coleman ◽  
Albert Ferrer-Ugalde ◽  
Martin P. Atkins ◽  
Małgorzata Swadźba-Kwaśny
Keyword(s):  
Lewis Acids ◽  
Coordination Complexes ◽  
New Class ◽  
Competitive Process ◽  
Low Viscosity

Low-viscosity polyalphaolefins were synthesised using AlCl3-based liquid coordination complexes (LCCs), in a sustainable and economically competitive process.

scholarly journals Twistable electronics with dynamically rotatable heterostructures

Science ◽  
2018 ◽  
Vol 361 (6403) ◽  
pp. 690-693 ◽  
Author(s):  
Rebeca Ribeiro-Palau ◽  
Changjian Zhang ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
James Hone ◽  
...  
Keyword(s):  
Rotation Angle ◽  
Electronic Devices ◽  
Long Wavelength ◽  
New Class ◽  
On Demand ◽  
Device Architecture ◽  
Two Dimensional Materials ◽  
Electronic Response ◽  
Small Rotation

In heterostructures of two-dimensional materials, electronic properties can vary dramatically with relative interlayer angle. This effect makes it theoretically possible to realize a new class of twistable electronics in which properties can be manipulated on demand by means of rotation. We demonstrate a device architecture in which a layered heterostructure can be dynamically twisted in situ. We study graphene encapsulated by boron nitride, where, at small rotation angles, the device characteristics are dominated by coupling to a long-wavelength moiré superlattice. The ability to investigate arbitrary rotation angle in a single device reveals features of the optical, mechanical, and electronic response in this system not captured in static rotation studies. Our results establish the capability to fabricate twistable electronic devices with dynamically tunable properties.

Sign in / Sign up

Export Citation Format

Share Document