Counter-anion role in the formation of two supramolecular complexes: [Ag2(DPP)2](ClO4)2·CH3CN and [Ag2(DPP)2(NO3)2] {DPP isN-[(diphenylphosphanyl)methyl]pyridin-4-amine}

2014 ◽  
Vol 70 (4) ◽  
pp. 379-383
Author(s):  
Guang-Ming Liang ◽  
Jing Shang ◽  
Kun-Guo Yang ◽  
Kai Ma ◽  
Qing-Ling Ni
Keyword(s):  
Self Assembly ◽  
Weak Interactions ◽  
Coordination Geometry ◽  
Counter Anion ◽  
Acetonitrile Molecule ◽  
A Chain ◽  
Ag Contact ◽  
Nitrate Anions ◽  
Distorted Tetrahedral Coordination ◽  
Linear Coordination

The title compounds, bis{μ-N-[(diphenylphosphanyl)methyl]pyridin-4-amine-κ2N1:P}disilver bis(perchlorate) acetonitrile monosolvate, [Ag2(C18H17N2P)2](ClO4)2·CH3CN, (1), and bis{μ-N-[(diphenylphosphanyl)methyl]pyridin-4-amine-κ2N1:P}bis[(nitrato-κ2O,O)silver], [Ag2(C18H17N2P)2(NO3)2], (2), each contain disilver macrocyclic [Ag2(C18H17N2P)2]2+cations lying about inversion centres. The cations are constructed by twoN-[(diphenylphosphanyl)methyl]pyridin-4-amine (DPP) ligands linking two Ag+cations in a head-to-tail fashion. In (1), the unique Ag+cation has a near-linear coordination geometry consisting of one pyridine N atom and one P atom from two different DPP ligands. Two ClO4−anions doubly bridge two metallomacrocycles through Ag...O and N—H...O weak interactions to form a chain extending in thecdirection. The half-occupancy acetonitrile molecule lies with its methyl C atom on a twofold axis and makes a weak N...Ag contact. In (2), there are two independent [Ag(C18H17N2P)]+cations. The nitrate anions weakly chelate to each Ag+cation, leading to each Ag+cation having a distorted tetrahedral coordination geometry consisting of one pyridine N atom and one P atom from two different DPP ligands, and two chelating nitrate O atoms. Each dinuclear [Ag2(C18H17N2P)2(NO3)2] molecule acts as a four-node to bridge four adjacent equivalent molecules through N—H...O interactions, forming a two-dimensional sheet parallel to thebcplane. Each sheet contains dinuclear molecules involving just Ag1 or Ag2 and these two types of sheet are stacked in an alternating fashion. The sheets containing Ag1 all lie nearx= {1 \over 2}, {3 \over 2}, {5 \over 2}etc, while those containing Ag2 all lie nearx= 0, 1, 2etc. Thus, the two independent sheets are arranged in an alternating sequence atx= 0, {1 \over 2}, 1, {3 \over 2}etc. These two different supramolecular structures result from the different geometric conformations of the templating anions which direct the self-assembly of the cations and anions.

One-dimensional CuIand AgIladder-like coordination polymers supported by 2-ethyl-1-(pyridin-3-ylmethyl)-1H-benzimidazole

2013 ◽  
Vol 69 (9) ◽  
pp. 1017-1021
Author(s):  
Liu-cheng Gui ◽  
Guang-ming Liang ◽  
Hua-hong Zou ◽  
Zhong Hou
Keyword(s):  
Hydrogen Bonds ◽  
Metal Ion ◽  
Three Dimensional ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
Asymmetric Unit ◽  
Counter Anion ◽  
One Dimensional ◽  
Solvent Molecules ◽  
Distorted Tetrahedral Coordination

The title complexes, poly[[bis[μ2-2-ethyl-1-(pyridin-3-ylmethyl)-1H-benzimidazole-κ2N1:N3]copper(I)] tetrafluoroborate acetonitrile monosolvate], {[Cu(C15H15N3)2]BF4·CH3CN}n, (I), and poly[[bis[μ2-2-ethyl-1-(pyridin-3-ylmethyl)-1H-benzimidazole-κ2N1:N3]silver(I)] perchlorate methanol monosolvate], {[Ag(C15H15N3)2]ClO4·CH3OH}n, (II), are isostructural and exhibit one-dimensional ladder-like structures in which each asymmetric unit contains one metal ion (Cu+or Ag+), two 2-ethyl-1-(pyridin-3-ylmethyl)-1H-benzimidazole (bep) ligands, one counter-anion (tetrafluoroborate or perchlorate) and one interstitial molecule (acetonitrile or methanol). Each metal ion exhibits a distorted tetrahedral coordination geometry consisting of two pyridyl and two benzimidazole N atoms from four distinct ligands. Two metal ions are linked by two bep ligands to form a centrosymmetric 18-memberedM2(bep)2metallacycle, while adjacentM2(bep)2metallacycles are further interlinked by another two bep ligands resulting in a ladder-like array. In the extended structure, four adjacent ladder-like arrays are connected together through C—H...F, O—H...O and C—H...O hydrogen bonds between bep ligands, solvent molecules and counter-anions into a three-dimensional supramolecular structure.

Redetermination of [bis(2-pyridyl)amine-N,N′]copper(II) diperchlorate

2000 ◽  
Vol 57 (1) ◽  
pp. m25-m27 ◽  
Author(s):  
Miao Du ◽  
Xian-He Bu ◽  
Lin-Hong Weng ◽  
Xue-Bing Leng ◽  
Ya-Mei Guo
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Coordination Sphere ◽  
Chain Structure ◽  
Title Complex ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
A Chain ◽  
Distorted Tetrahedral Coordination ◽  
Close Contacts

In the crystal structure of the title complex, [Cu(C10H9N3)2](ClO4)2, the CuIIcenter is four-coordinated by the nitrogen donors of the pyridine rings of the ligand, bis(2-pyridyl)amine. The crystal structure reveals that the CuN4coordination sphere has a distorted tetrahedral coordination geometry with a crystallographicC2axis through the CuIIcenter. The perchlorate anions link the complex cations to form a chain structure through C—H...O close contacts and N—H...O hydrogen bonds.

scholarly journals (N,N′-Diethylthiourea-κS)tris(triphenylphosphane-κP)silver(I) acetate methanol monosolvate

2014 ◽  
Vol 70 (6) ◽  
pp. m216-m217 ◽  
Author(s):  
Yupa Wattanakanjana ◽  
Arunpatcha Nimthong ◽  
Chanakan Kamrod
Keyword(s):  
Hydrogen Bond ◽  
Complex Molecule ◽  
Acetate Anion ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
Bond Forming ◽  
Dimensional Network ◽  
A Chain ◽  
Intermolecular Distances ◽  
Distorted Tetrahedral Coordination

In the mononuclear title complex, [Ag(C5H12N2S)(C18H15P)3](CH3COO)·CH3OH, the AgIion is in a distorted tetrahedral coordination geometry formed by three P atoms from three triphenylphosphane ligands and one S atom from anN,N′-diethylthiourea ligand. In the crystal, the acetate anion is connected to the complex moleculeviaa pair of N—H...O hydrogen bonds [graph-set motifR22(8)] and the solvent methanol molecule is connected to the anionviaan O—H...O hydrogen bond. This aggregate is further connected through a weak C—H...O hydrogen bond, forming a chain along [100]. In addition, sixfold phenyl embraces with intermolecular distances of 6.6463 (13)–6.667 (2) Å are arranged in a chain along [001]. The combination of hydrogen bonding and phenyl...phenyl interactions leads to the formation of a two-dimensional network parallel to (010).

scholarly journals [1H-1,2,4-Triazole-5(4H)-thione-κS]bis(triphenylphosphane-κP)(nitrato-κO)silver(I) methanol monosolvate

2014 ◽  
Vol 70 (2) ◽  
pp. m61-m62 ◽  
Author(s):  
Yupa Wattanakanjana ◽  
Sureeporn Palamae ◽  
Jenejira Ratthiwan ◽  
Ruthairat Nimthong
Keyword(s):  
Hydrogen Bonds ◽  
Title Complex ◽  
Coordination Geometry ◽  
Supramolecular Architecture ◽  
Two Dimensional ◽  
Tetrahedral Coordination ◽  
Crystal Complex ◽  
Solvent Molecules ◽  
A Chain ◽  
Distorted Tetrahedral Coordination

In the title complex, [Ag(NO3)(C2H3N3S)(C18H15P)2]·CH3OH, the AgIion exhibits a distorted tetrahedral coordination geometry formed by two P atoms from two triphenylphosphine ligands, one S atom from a 1H-1,2,4-triazole-5(4H)-thione ligand and one O atom from a nitrate ion. In the crystal, complex and solvent molecules are linked by O—H...O and N—H...O hydrogen bonds forming a chain along theb-axis direction. The chains are linked by weak C—H...O hydrogen bonds forming a two-dimensional supramolecular architecture parallel to (001). In addition, an intramolecular N—H...O hydrogen bond is observed.

scholarly journals Tetrakis[bis(pyridin-2-yl)amine-κN2](nitrato-κO)silver(I)

2014 ◽  
Vol 70 (2) ◽  
pp. m58-m59 ◽  
Author(s):  
Yuliia Parashchenko ◽  
Anna Pavlishchuk ◽  
Nadezhda A. Bokach ◽  
Matti Haukka
Keyword(s):  
Hydrogen Bonds ◽  
Weak Interactions ◽  
Minor Component ◽  
Title Complex ◽  
Complex Molecules ◽  
Coordination Environment ◽  
Amine Ligands ◽  
A Chain ◽  
Nitrate Anions

In the title complex, [Ag(NO3)(C10H9N3)4], the nitrate ligand is found to be disordered over two sets of positions, with occupancy factors of 0.473 (5) and 0.527 (5). The AgIion is located in a square-pyramidal coordination environment formed by four N atoms from four bis(pyridin-2-yl)amine ligands and one O atom from a nitrate ligand. Weak interactions between the AgIions and the nitrate anions acting in a monodentate mode [Ag...O = 2.791 (13) and 2.816 (9) Å for the major component of the nitrate ligand, and 2.865 (8) and 2.837 (8) Å for the minor component] link the complex molecules into a chain along [001]. N—H...O hydrogen bonds are observed.

A new heteroleptic cuprous complex with strong yellow photoluminescence

2014 ◽  
Vol 70 (9) ◽  
pp. 858-861 ◽  
Author(s):  
Kaijie Xu ◽  
Mingwei Hong ◽  
Yicheng Zhang ◽  
Li Song ◽  
Wenxiang Chai
Keyword(s):  
Yellow Emission ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
X Ray Diffraction ◽  
Acetonitrile Molecule ◽  
X Ray ◽  
Emission Signal ◽  
Ligand Charge Transfer ◽  
Distorted Tetrahedral Coordination ◽  
Cuprous Complex

In the title heteroleptic cuprous complex, (acetonitrile-κN)({2-[2-(diphenylphosphanyl)phenoxy]phenyl}diphenylphosphane-κ2P,P′)[2-(pyridin-4-yl-κN)-1,3-benzoxazole]copper(I) hexafluoridophosphate, [Cu(C36H28OP2)(CH3CN)(C12H8N2O)]PF6, conventionally abbreviated [Cu(POP)(CH3CN)(4-PBO)]PF6, where POP is the diphosphane ligand {2-[2-(diphenylphosphanyl)phenoxy]phenyl}diphenylphosphane and 4-PBO is the N-containing ligand 2-(pyridin-4-yl)-1,3-benzoxazole, the asymmetric unit consists of a hexafluoridophosphate anion and a whole mononuclear cation, where the CuIcentre is coordinated by two P atoms from the POP ligand, by one N atom from the 4-PBO ligand and by the N atom of the coordinated acetonitrile molecule, giving rise to a CuP2N2distorted tetrahedral coordination geometry. The electronic absorption, photoluminescence and thermal stability properties of this complex have been studied on as-synthesized samples, which had previously been examined by powder X-ray diffraction. A yellow emission signal is attributed to an excited state arising from metal-to-ligand charge transfer (MLCT).

scholarly journals Self-replication of a quantum artificial organism driven by single-photon pulses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Valente
Keyword(s):  
Self Assembly ◽  
Artificial Life ◽  
Single Photon ◽  
Self Organization ◽  
Physical Systems ◽  
Self Organized ◽  
Living Organisms ◽  
A Chain ◽  
Thermodynamic Mechanism ◽  
Self Replication

AbstractImitating the transition from inanimate to living matter is a longstanding challenge. Artificial life has achieved computer programs that self-replicate, mutate, compete and evolve, but lacks self-organized hardwares akin to the self-assembly of the first living cells. Nonequilibrium thermodynamics has achieved lifelike self-organization in diverse physical systems, but has not yet met the open-ended evolution of living organisms. Here, I look for the emergence of an artificial-life code in a nonequilibrium physical system undergoing self-organization. I devise a toy model where the onset of self-replication of a quantum artificial organism (a chain of lambda systems) is owing to single-photon pulses added to a zero-temperature environment. I find that spontaneous mutations during self-replication are unavoidable in this model, due to rare but finite absorption of off-resonant photons. I also show that the replication probability is proportional to the absorbed work from the photon, thereby fulfilling a dissipative adaptation (a thermodynamic mechanism underlying lifelike self-organization). These results hint at self-replication as the scenario where dissipative adaptation (pointing towards convergence) coexists with open-ended evolution (pointing towards divergence).

A new one-dimensional CdIIcoordination polymer with a two-dimensional layered structure incorporating 2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole and benzene-1,2-dicarboxylate ligands

2016 ◽  
Vol 72 (6) ◽  
pp. 480-484 ◽  
Author(s):  
Qiu-Ying Huang ◽  
Xiao-Yi Lin ◽  
Xiang-Ru Meng
Keyword(s):  
Layered Structure ◽  
Room Temperature ◽  
Weak Interactions ◽  
Coordination Geometry ◽  
Dimensional Chain ◽  
Two Dimensional ◽  
One Dimensional ◽  
Heterocyclic Ligand ◽  
Rich Variety ◽  
Solvent Molecules

The N-heterocyclic ligand 2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole (imb) has a rich variety of coordination modes and can lead to polymers with intriguing structures and interesting properties. In the coordination polymercatena-poly[[cadmium(II)-bis[μ-benzene-1,2-dicarboxylato-κ4O1,O1′:O2,O2′]-cadmium(II)-bis{μ-2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole}-κ2N2:N3;κ2N3:N2] dimethylformamide disolvate], {[Cd(C8H4O4)(C11H10N4)]·C3H7NO}n, (I), each CdIIion exhibits an irregular octahedral CdO4N2coordination geometry and is coordinated by four O atoms from two symmetry-related benzene-1,2-dicarboxylate (1,2-bdic2−) ligands and two N atoms from two symmetry-related imb ligands. Two CdIIions are connected by two benzene-1,2-dicarboxylate ligands to generate a binuclear [Cd2(1,2-bdic)2] unit. The binuclear units are further connected into a one-dimensional chain by pairs of bridging imb ligands. These one-dimensional chains are further connected through N—H...O hydrogen bonds and π–π interactions, leading to a two-dimensional layered structure. The dimethylformamide solvent molecules are organized in dimeric pairsviaweak interactions. In addition, the title polymer exhibits good fluorescence properties in the solid state at room temperature.

Bis(2,9-dimethyl-1,10-phenanthroline)copper(I) tetraphenylborate dichloromethane solvate

2007 ◽  
Vol 63 (3) ◽  
pp. m800-m802 ◽  
Author(s):  
William T. Eckenhoff ◽  
Tomislav Pintauer
Keyword(s):  
Bond Length ◽  
Dihedral Angle ◽  
Title Compound ◽  
Stacking Interactions ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
Π Stacking ◽  
Distorted Tetrahedral Coordination

In the title compound, [Cu(C14H12N2)2]C24H20B·CH2Cl2, CuI is chelated by two 2,9-dimethyl-1,10-phenanthroline (2,9-Me2phen) ligands, in a distorted tetrahedral coordination geometry. The average Cu—N bond length is 2.032 Å, and the interligand dihedral angle is 77.60 (6)°. The complexes form π–π stacking interactions between 2,9-Me2phen ligands, with a perpendicular interplanar separation of 3.652 (5) Å.

scholarly journals The magneto-elastica : from self-buckling to self-assembly

2014 ◽  
Vol 470 (2162) ◽  
pp. 20130609 ◽  
Author(s):  
Dominic Vella ◽  
Emmanuel du Pontavice ◽  
Cameron L. Hall ◽  
Alain Goriely
Keyword(s):  
Self Assembly ◽  
Permanent Magnets ◽  
Energy Estimates ◽  
Dimensional Chain ◽  
Elastic Rod ◽  
Straight Chain ◽  
One Dimensional ◽  
Vibration Dynamics ◽  
Magnetic Strength ◽  
A Chain

Spherical neodymium–iron–boron magnets are permanent magnets that can be assembled into a variety of structures owing to their high magnetic strength. A one-dimensional chain of these magnets responds to mechanical loadings in a manner reminiscent of an elastic rod. We investigate the macroscopic mechanical properties of assemblies of ferromagnetic spheres by considering chains, rings and chiral cylinders of magnets. Based on energy estimates and simple experiments, we introduce an effective magnetic bending stiffness for a chain of magnets and show that, used in conjunction with classic results for elastic rods, it provides excellent estimates for the buckling and vibration dynamics of magnetic chains. We then use this estimate to understand the dynamic self-assembly of a cylinder from an initially straight chain of magnets.

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