Engineering two-dimensional hybrid NaCl–organic coordinated nanoarchitectures on metal surfaces

2015 ◽  
Vol 51 (67) ◽  
pp. 13162-13165 ◽  
Author(s):  
Jérémy Hieulle ◽  
David Peyrot ◽  
Zhen Jiang ◽  
Fabien Silly
Keyword(s):  
Metal Surfaces ◽  
Chain Structure ◽  
Two Dimensional ◽  
Flower Structure ◽  
Mesh Structure ◽  
Self Assembled ◽  
A Chain

We selectively engineer three two-dimensional self-assembled hybrid PTCDI–NaCl nanoarchitectures,i.e.a flower-structure, a mesh-structure and a chain-structure on Au(111).

Quantum confinement in self-assembled two-dimensional nanoporous honeycomb networks at close-packed metal surfaces

2015 ◽  
Vol 142 (10) ◽  
pp. 101931 ◽  
Author(s):  
N. Kepčija ◽  
T.-J. Huang ◽  
F. Klappenberger ◽  
J. V. Barth
Keyword(s):  
Quantum Confinement ◽  
Metal Surfaces ◽  
Two Dimensional ◽  
Self Assembled

catena-Poly[[(4,7-diphenyl-1,10-phenanthroline)lead(II)]-μ-benzene-1,4-dicarboxylato]

2007 ◽  
Vol 63 (11) ◽  
pp. m2803-m2803 ◽  
Author(s):  
Yan-Bing Yin ◽  
Hai-Xia Yu
Keyword(s):  
Title Compound ◽  
Layer Structure ◽  
Chain Structure ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Π Stacking ◽  
Supramolecular Layer ◽  
A Chain

In the title compound, [Pb(C8H4O4)(C24H16N2)] n , the benzene-1,4-dicarboxylate (1,4-BDC) dianions link the PbII atoms to form a chain structure. The PbII atom is coordinated by 4,7-diphenyl-1,10-phenanthroline (L) and is also bonded to four 1,4-BDC O atoms, resulting in a very distorted cis-PbN2O4 octahedron. There are two 1,4-BDC half-anions in the asymmetric unit, both completed by inversion. Aromatic π–π stacking between L ligands in adjacent chains results in a two-dimensional supramolecular layer structure [minimum centroid–centroid separation 3.464 (5) Å].

Three coordination polymers built by quaternary-ammonium-modified isophthalic acid

2021 ◽  
Vol 77 (5) ◽  
Author(s):  
Li-Fei Wang ◽  
Xing-Gui Liu ◽  
Mei-Mei Meng ◽  
Yong-Kai Xu ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
Layered Structure ◽  
Quaternary Ammonium ◽  
Layer Structure ◽  
Chain Structure ◽  
Isophthalic Acid ◽  
Two Dimensional ◽  
Polymeric Networks ◽  
A Chain

Three coordination polymers based on quaternary-ammonium-modified isophthalic acid, namely, catena-poly[[[aqua-μ2-bromido-di-μ3-hydroxido-methanoldinitratotetracopper(II)]-bis{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}] nitrate], {[Cu4Br(C19H28NO5)2(NO3)2(OH)2(CH4O)(H2O)]NO3} n , 1, poly[μ3-bromido-μ2-bromido-bromido-μ3-hydroxido-{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}tricopper(II)], [Cu3Br3(C19H28NO5)(OH)] n , 2, and poly[bromido{μ3-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}zinc(II)], [ZnBr(C19H28NO5)] n , 3, were obtained by solvothermal reactions. Coordination polymer (CP) 1 contains tetranuclear Cu4 units, in which the four Cu atoms are linked by two μ3-OH− groups into a Cu4(OH)2 cluster, which are in turn linked by 5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylate (cpa−) ligands into a chain structure. CP 2 also contains a tetranuclear Cu4(OH)2 cluster and these are linked with CuBr3 units into chains. The chains are then connected by cpa− ligands into a two-dimensional layered structure. CP 3 contains a two-dimensional layer structure built by binuclear Zn2 units and cpa− ligands. The Br− counter-anions of the quaternary ammonium groups all take part in the construction of the polymeric networks.

Novel Synthetic Routes to s-Block Metal 2,5-Diphenylphospholides and Crystal Structures of the Bis(tetrahydrofuran) Complexes of the Potassium, Calcium, and Strontium Derivatives

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1360-1368 ◽  
Author(s):  
Katja Wimmer ◽  
Christin Birg ◽  
Robert Kretschmer ◽  
Tareq M.A. Al-Shboul ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Chain Structure ◽  
Molecular Structures ◽  
Metathesis Reaction ◽  
Sandwich Complex ◽  
Coordination Site ◽  
Metal Atoms ◽  
Synthetic Routes ◽  
A Chain

The reduction of 1,4-diphenyl-1,4-bis(diphenylphosphanyl)buta-1,3-diene (1) (1,4-diphenyl- NUPHOS) with potassium in THF yields bis(THF)potassium 2,5-diphenylphospholide (2) which crystallizes with a chain structure. The metathesis reaction of 2 with the iodides of calcium, strontium, and barium leads to the formation of [bis(THF)calcium bis(2,5-diphenylphospholide)] (3), [bis(THF)strontium bis(2,5-diphenylphospholide)] (4), and [bis(THF)barium bis(2,5-diphenylphospholide)] (5). The reaction of M{P(H)SiiPr3}2 with diphenylbutadiyne in THF also leads to the formation of the 2,5-diphenylphospholides of calcium (3), strontium (4), and barium (5). The molecular structures of 2 to 4 are discussed. The environment of the metal atoms is very similar in all these compounds: The metal atoms show an η5 coordination to the phospholide rings forming a bent sandwich complex. The open coordination site is occupied by two THF molecules

scholarly journals Template-Free Self-Assembly of Two-Dimensional Polymers into Nano/Microstructured Materials

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3310
Author(s):  
Shengda Liu ◽  
Jiayun Xu ◽  
Xiumei Li ◽  
Tengfei Yan ◽  
Shuangjiang Yu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Recent Progress ◽  
Two Dimensional ◽  
Subsequent Removal ◽  
The Past ◽  
2D Polymers ◽  
Template Free ◽  
Self Assembled ◽  
The Relationship ◽  
Polymer Tubes

In the past few decades, enormous efforts have been made to synthesize covalent polymer nano/microstructured materials with specific morphologies, due to the relationship between their structures and functions. Up to now, the formation of most of these structures often requires either templates or preorganization in order to construct a specific structure before, and then the subsequent removal of previous templates to form a desired structure, on account of the lack of “self-error-correcting” properties of reversible interactions in polymers. The above processes are time-consuming and tedious. A template-free, self-assembled strategy as a “bottom-up” route to fabricate well-defined nano/microstructures remains a challenge. Herein, we introduce the recent progress in template-free, self-assembled nano/microstructures formed by covalent two-dimensional (2D) polymers, such as polymer capsules, polymer films, polymer tubes and polymer rings.

ENCRYPTION-DECRYPTION TECHNIQUES FOR PICTURES

1989 ◽  
Vol 03 (03n04) ◽  
pp. 497-503
Author(s):  
RANI SIROMONEY ◽  
K. G. SUBRAMANIAN ◽  
P. J. ABISHA
Keyword(s):  
Public Key ◽  
Two Dimensional ◽  
Chain Code ◽  
Dimensional Array ◽  
Public Key Cryptosystems ◽  
Encryption Decryption ◽  
A Chain

Language theoretic public key cryptosystems for strings and pictures are discussed. Two methods of constructing public key cryptosystems for the safe transmission or storage of chain code pictures are presented; the first one encrypts a chain code picture as a string and the second one as a two-dimensional array.

scholarly journals Two-Dimensional Layered Oxide Structures Tailored by Self-Assembled Layer Stacking via Interfacial Strain

2016 ◽  
Vol 8 (26) ◽  
pp. 16845-16851 ◽  
Author(s):  
Wenrui Zhang ◽  
Mingtao Li ◽  
Aiping Chen ◽  
Leigang Li ◽  
Yuanyuan Zhu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Layered Oxide ◽  
Layer Stacking ◽  
Interfacial Strain ◽  
Self Assembled ◽  
Self Assembled Layer

Syntheses, Structural Characterization and Fluorescence of Zn(II) and Cd(II) Polymers from 5-(Pyridin-2-ylmethylamino)isophthalic acid

2013 ◽  
Vol 68 (9) ◽  
pp. 1007-1014 ◽  
Author(s):  
Xiao-Chun Cheng ◽  
Xiao-Hong Zhu ◽  
Hai-Wei Kuai
Keyword(s):  
Water Clusters ◽  
Hydrothermal Reaction ◽  
Reaction System ◽  
Chain Structure ◽  
Isophthalic Acid ◽  
Auxiliary Ligand ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkaline Reaction ◽  
A Chain

The hydrothermal reaction of Zn(II) nitrate with 5-(pyridin-2-ylmethylamino)isophthalic acid (H2L) yields the complex [Zn(L)(H2O)] 2H2O (1). When 2,2'-bipyridine (bpy) as auxiliary ligand and Cd(II) nitrate were used in the alkaline reaction system, [Cd(L)(H2O)(bpy)] 3H2O (2) was obtained. Complexes 1 and 2 have been characterized by single-crystal and powder X-ray diffraction, IR, elemental and thermogravimetric analyses. Complex 1 shows a 2D fes network structure with uninodal 3-connected (4.82) topology, which is further linked by hydrogen bonding to give rise to a 3D supramolecular framework; complex 2 displays a chain structure. Interestingly, tetranuclear water clusters were generated in 1, which are interlinked to fabricate a water chain structure. The fluorescence properties of 1 and 2 were investigated

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