A homochiral Zn–Dy heterometallic left-handed helical chain complex without chiral ligands: anion-induced assembly and multifunctional integration

2018 ◽  
Vol 54 (95) ◽  
pp. 13379-13382 ◽  
Author(s):  
Cai-Ming Liu ◽  
De-Qing Zhang ◽  
Ren-Gen Xiong ◽  
Xiang Hao ◽  
Dao-Ben Zhu
Keyword(s):  
Chain Complex ◽  
Chiral Ligands ◽  
Helical Chain ◽  
Left Handed ◽  
Pentanuclear Complex

The Zn3Dy2 pentanuclear complex evolved into a heterometallic left-handed helical chain multifunctional complex by the template action of perchlorate anion.

scholarly journals catena-Poly[[silver(I)-μ-N-[(pyridin-2-yl)methyl]pyridine-3-amine-κ2N:N′] hexafluoridophosphate]

2014 ◽  
Vol 70 (6) ◽  
pp. m233-m233 ◽  
Author(s):  
Suk-Hee Moon ◽  
Ki-Min Park
Keyword(s):  
Helical Chain ◽  
Supramolecular Network ◽  
Stacking Interactions ◽  
Left Handed ◽  
Hydrogen Bonding Interactions ◽  
Centroid Distance ◽  
Amine Ligands ◽  
The Right ◽  
Linear Coordination ◽  
Methyl Pyridine

In the title polymeric complex, {[Ag(C11H11N3)]PF6}n, the AgIion is two-coordinated in a nearly linear coordination geometry [N—Ag—N = 175.98 (9)°] by two pyridine N atoms from two symmetry-relatedN-[(pyridine-2-yl)methyl]pyridine-3-amine ligands. Each AgIion is bridged by the ligands, forming a helical chain propagating along theb-axis direction. The right- and left-handed helical chains are alternately arrangedviaAg...Ag [3.2639 (5) Å] and π–π stacking interactions [centroid–centroid distance = 3.523 (1) Å], resulting in the formation of a two-dimensional supramolecular network extending parallel to (101). Weak Ag...F interactions [longest Ag...F interaction = 3.153 (2) Å], as well as N—H...F and C—H...F hydrogen-bonding interactions, occur between the helical chains and the anions.

scholarly journals Crystal structure ofcatena-poly[[silver(I)-μ-N-(pyridin-2-ylmethyl)pyridine-3-amine-κ2N:N′] trifluoromethanesulfonate]

2014 ◽  
Vol 70 (11) ◽  
pp. 389-391 ◽  
Author(s):  
Suk-Hee Moon ◽  
Seonghwa Cho ◽  
Ki-Min Park
Keyword(s):  
Axial Direction ◽  
Helical Chain ◽  
Supramolecular Network ◽  
Stacking Interactions ◽  
Coordination Geometry ◽  
Left Handed ◽  
Hydrogen Bonding Interactions ◽  
Amine Ligands ◽  
The Right ◽  
Linear Coordination

In the asymmetric unit of the title compound, {[Ag(C11H11N3)]CF3SO3}n, there are two AgIatoms, twoN-(pyridine-2-ylmethyl)pyridine-3-amine ligands (AandB) and two CF3SO3−anions. Both AgIatoms are bridged by two pyridine N atoms from two symmetry-relatedAorBligands, forming right- or left-handed helical chains, respectively. The AgIatom of the right-handed helical chain adopts a slightly distorted linear coordination geometry [N—Ag—N = 170.69 (14)°], while that of the left-handed helical chain adopts a bent geometry [N—Ag—N = 149.42 (14)°]. Both helical chains have the same pitch length [10.8437 (5) Å], propagate along theb-axial direction and are alternately arrangedviaAg...Ag [3.0814 (5) Å] and π–π stacking interactions [centroid–centroid distances = 3.514 (3) and 3.487 (3) Å], resulting in the formation of a two-dimensional supramolecular network extending parallel to theabplane. Weak Ag...O [2.861 (4), 2.617 (3), and 2.624 (4) Å] and Ag...F [3.017 (3) Å] interactions as well as N—H...O and C—H...O, C—H...N and C—H...F hydrogen-bonding interactions occur between the helical chains and the anions.

Distinct chiral units from an axially prochiral ligand in a photoluminescent zinc(II)–organic complex

2012 ◽  
Vol 68 (4) ◽  
pp. m90-m93 ◽  
Author(s):  
Ming-Xing Zhang ◽  
Xin Chen ◽  
Kun-Lin Huang ◽  
Yi Zhu ◽  
Shan-Shan Yang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Helical Chain ◽  
Supramolecular Architecture ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Organic Complex ◽  
One Dimensional ◽  
Left Handed ◽  
The Right

The asymmetric unit of the title compound, poly[(dimethylamine-κN)[μ3-(E)-2,6-dimethyl-4-styrylpyridine-3,5-dicarboxylato-κ3O3:O3′:O5]zinc(II)], [Zn(C17H13NO4)(C2H7N)]n, consists of one crystallographically independent distorted tetrahedral ZnIIcation, one (E)-2,6-dimethyl-4-styrylpyridine-3,5-dicarboxylate (mspda2−) ligand and one coordinated dimethylamine molecule. TwoS- andR-type chiral units are generated from the axially prochiral mspda2−ligand through C—H...O hydrogen bonds. TheR-type chiral units assemble a left-handed (M) Zn–mspda helical chain, while the right-handed (P) Zn–mspda helical chain is constructed from neighbouringS-type chiral units. TheP- andM-type helical chains are interlinked by carboxylate O atoms to form a one-dimensional ladder. Interchain N—H...O hydrogen bonds extend these one-dimensional ladders into a two-dimensional supramolecular architecture. The title compound exhibits luminescence at λmax= 432 nm upon excitation at 365 nm.

scholarly journals Crystal structure of a one-dimensional helical-type silver(I) coordination polymer:catena-poly[[silver(I)-μ-N-(pyridin-4-ylmethyl)pyridine-3-amine-κ2N:N′] nitrate dimethyl sulfoxide disolvate]

2014 ◽  
Vol 70 (12) ◽  
pp. 507-509 ◽  
Author(s):  
Bokhee Moon ◽  
Youngeun Jeon ◽  
Suk-Hee Moon ◽  
Ki-Min Park
Keyword(s):  
Crystal Structure ◽  
Dimethyl Sulfoxide ◽  
Solvent Molecule ◽  
Helical Chain ◽  
Supramolecular Network ◽  
Nitrate Anion ◽  
Left Handed ◽  
Hydrogen Bonding Interactions ◽  
Centroid Distance ◽  
Linear Coordination

The asymmetric unit of the title compound, {[Ag(C11H11N3)]NO3·2(CH3)2SO}n, comprises one AgIatom, oneN-(pyridine-4-ylmethyl)pyridine-3-amine ligand, one nitrate anion and two dimethyl sulfoxide molecules. The AgIatoms are bridged by two pyridine N atoms from two symmetry-related ligands, forming a helical chain and adopting a slightly distorted linear coordination geometry [N—Ag—N = 175.37 (8)°]. The helical chain, with a pitch length of 16.7871 (8) Å, propagates along theb-axis direction. In the crystal, symmetry-related right- and left-handed helical chains are alternately arrangedviaAg...Ag interactions [3.4145 (4) Å] and π–π stacking interactions [centroid–centroid distance = 3.650 (2) Å], resulting in the formation of a two-dimensional supramolecular network extending parallel to (100). Weak Ag...O [2.775 (2), 3.169 (4) and 2.690 (2) Å] interactions, as well as several N—H...O and C—H...O hydrogen-bonding interactions, contribute to the stabilization of the crystal structure. Parts of the dimethyl sulfoxide solvent molecule are disordered over two sets of sites in a 0.937 (3):0.063 (3) ratio.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Left handed GDPs and students

BDJ ◽  
1995 ◽  
Vol 178 (12) ◽  
pp. 448-448 ◽  
Author(s):  
J M Brown
Keyword(s):  
Left Handed

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

Parallel Ring-Line Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines

2014 ◽  
Vol E97.C (10) ◽  
pp. 965-971 ◽  
Author(s):  
Tadashi KAWAI ◽  
Yuma SUMITOMO ◽  
Akira ENOKIHARA ◽  
Isao OHTA ◽  
Kei SATOH ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Loose Coupling ◽  
Left Handed ◽  
Ring Line
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