A comparison of donor–acceptor interactions of N-heterocyclic carbenes and sulfonium ylides in coordination with coinage metal ions

Polyhedron ◽  
2019 ◽  
Vol 157 ◽  
pp. 208-218 ◽  
Author(s):  
Asieh Sedghi ◽  
Mehdi Bayat ◽  
Seyyed Javad Sabounchei ◽  
Mitra Khodabandehloo
Keyword(s):  
Metal Ions ◽  
Heterocyclic Carbenes ◽  
Coinage Metal ◽  
Donor Acceptor ◽  
Sulfonium Ylides

Donor-acceptor Stenhouse Adducts with Three Orthogonally Controlled Intrisic Stationary States

2020 ◽  
Author(s):  
Yongli Duan ◽  
Haiquan Zhao ◽  
GuoDong Xue ◽  
Ze Wang ◽  
Chaoyue Xiong ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Smart Materials ◽  
Green Light ◽  
Supramolecular Structures ◽  
The Other ◽  
Van Der Waals Interactions ◽  
Stationary States ◽  
Complex Stimuli ◽  
Donor Acceptor

Abstract Photoresponsive molecules with more than two intrinsic stationary states are very Interesting. Here, we demonstrate a series of crown ether (CE) substituted donor-acceptor Stenhouse adducts (DASAs) that can be switched between three stationary states under orthogonal control of light and metal ions. DASA-CE molecules are self-assembled into 1:1 head-to-tail supramolecular structures to form di-linear states due to strong van der Waals interactions between electron-donating and -withdrawing moieties. Furthermore, treatment with metal ions (Na+ or K+) switches the di-linear back to the linear state, which is reversible after adding free crown ether. On the other hand, green light irradiation induces linear-to-cyclic isomerization of DASA-CE, while the photoisomerization from di-linear to cyclic state is inhibited. The reverse cyclic-to-linear isomerization can occur under heating in the dark. All in all, the orthogonal switching of DASA-CE between di-linear, linear and cyclic states enables the development of smart materials in environments with complex stimuli.

scholarly journals N-Heterocyclic carbenes on close-packed coinage metal surfaces: bis-carbene metal adatom bonding scheme of monolayer films on Au, Ag and Cu

2017 ◽  
Vol 8 (12) ◽  
pp. 8301-8308 ◽  
Author(s):  
Li Jiang ◽  
Bodong Zhang ◽  
Guillaume Médard ◽  
Ari Paavo Seitsonen ◽  
Felix Haag ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Metal Surfaces ◽  
Heterocyclic Carbenes ◽  
Solid Surfaces ◽  
Monolayer Films ◽  
Coinage Metal ◽  
Bonding Scheme ◽  
Group 11 Metals

N-Heterocyclic carbenes wet the solid surfaces of group 11 metals with energetically favourable electron donating biscarbene metal complexes.

Non-covalent interactions in coinage metal complexes of 1,2,4-triazole-based N-heterocyclic carbenes

2014 ◽  
Vol 43 (41) ◽  
pp. 15465-15474 ◽  
Author(s):  
Jan Turek ◽  
Illia Panov ◽  
Petr Švec ◽  
Zdeňka Růžičková ◽  
Aleš Růžička
Keyword(s):  
Metal Complexes ◽  
Heterocyclic Carbenes ◽  
Coinage Metal ◽  
Complete Series ◽  
Non Covalent Interactions ◽  
Covalent Interactions

Non-covalent interactions were revealed in the complete series of coinage metal complexes of the type (NHC)MX (M = Cu, Ag, Au; X = Cl, Br, I) bearing 1,2,4-triazole based NHCs.

New sulfur-containing polymeric sorbents based on 2,2′-thiobisethanol dimethacrylate

2019 ◽  
Vol 91 (3) ◽  
pp. 409-420 ◽  
Author(s):  
Sylwia Ronka
Keyword(s):  
Metal Ions ◽  
Methylene Chloride ◽  
Suspension Polymerization ◽  
Polymer Chains ◽  
Synthesis Conditions ◽  
Polymeric Sorbents ◽  
Sorption Ability ◽  
Donor Acceptor ◽  
Precious Metal Ions ◽  
Selection Of

Abstract The first step in obtaining of a specific polymer sorbent containing sulfur atoms was the synthesis of a functional monomer – 2,2′-thiobisethanol dimethacrylate (TEDM). Synthesis consists of the reaction of 2,2′-thiobisethanol with methacryloyl chloride in the presence of triethylamine in methylene chloride. The new poly(dimethacrylate)s materials containing sulfur atoms were synthesized in radical suspension polymerization. Homopolymerization of 2,2′-thiobisethanol dimethacrylate and its copolymerization with ethylene glycol dimethacrylate or pentaerythritol tetraacrylate were carried out. The selection of synthesis conditions determines the parameters of the polymer structure and its properties. The presence of sulfur atoms in polymer chains resulted in specific donor-acceptor interactions, which can intensify sorption ability towards metal ions belonging to the group of soft acids. Therefore, the sorption properties of the obtained materials have been determined based on the recovery of precious metal ions, such as gold(III) and silver(I).

The Structure and Catalytic Properties of Coordination Polyhedra of 3d-Metals in Metaphosphate Melts

1994 ◽  
Vol 49 (11) ◽  
pp. 1539-1543 ◽  
Author(s):  
S. V. Volkov ◽  
V. A. Bandur ◽  
N. I. Buryak
Keyword(s):  
Metal Ions ◽  
Molecular Oxygen ◽  
Esr Spectroscopy ◽  
Catalytic Properties ◽  
Coordination Polyhedra ◽  
3D Metals ◽  
Oxygen Donor ◽  
Donor Acceptor ◽  
Mo Theory ◽  
Element Series

By EAS and ESR spectroscopy, oxygenated complexes of d-metals have been established in high-temperature melts NaPO3-Cr2O3-O2 and NaPO3-CoO-O2 and others of the type M(P03)ϰO2, where M is Cr, Co, V, and their structure has been established. The 18O/16O exchange reaction in the NaPO3-V2O5-O2 melt has been studied by mass spectrometry both in the presence of the oxidized substrate and in its absence. A general approach has been proposed explaining the interaction between polyphosphate complexes of 3d-metal ions and molecular oxygen and the oxidation ability of the oxygenated complexes in terms of the MO theory. It has been established three types of interaction between 3d-metal ions and molecular oxygen: donor, acceptor and donor-acceptor ones. Oxygenated complexes of the ions of the midle of the 3d-element series (d4-d7) were found to possess the revealed “par­tial’' oxidation ability towards alkanes.

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