Self-assembly Of Bis Research Articles

Self-assembly of bis-[1]rotaxanes based on diverse thiourea-bridged mono-functionalized dipillar[5]arenes

Self-assembly of bis-[1]rotaxanes based on diverse thiourea-bridged mono-functionalized dipillar[5]arenes

Anion Selective Ion Channel Constructed from a Self-Assembly of Bis(cholate)-Substituted Fumaramide.

The self-assembled ion channel constructed from bis(cholate)-substituted fumaramide is reported. Such ion channel formation was favored by intermolecular hydrogen bonding interactions among fumaramide moieties. Fluorescence kinetics experiments and planar bilayer conductance measurements confirmed the selective chloride transport through the channel. Theoretical calculations were done to confirm the hydrogen bonded self-assembly of fumaramides and chloride recognition within the cavity.

Syntheses, crystal structures and properties of two new molecular solids by self-assembly of bis(maleonitriledithiolate)nickel(III)/copper(II) anion and substituted 4-fluorobenzyl isoquinolinium cation

Two new molecular solids, [4FBzIQl][Ni(mnt)2](1) and [4FBzIQl]2[Cu(mnt)2](2) ([4FBzIQl]+=[1-(4′-fluorobenzyl)isoquinolinium; mnt2−=maleonitriledithiolate) have been obtained by complexing of the [M(mnt)2]n− (M=Ni(III) or Cu(II), n=1 or 2) anion with [4FBzIQl]+ cation. Single-crystal structural analysis reveals that both molecular metals crystallize in the triclinic space group P-1. The [Ni(mnt)2]− anions of 1 form a column by short C⋯N and C⋯C interactions between the cyano groups of the anions, while two adjacent [Cu(mnt)2]2− anions of 2 form a dimer through S⋯S interaction. The neighboring cations form a dimer or 2D layered structure through CH⋯F hydrogen bonds, F⋯F interactions, and π⋯π stack interactions. The anions and cations stack alternately into a 1D column through CH⋯N, π⋯π or/and CH⋯S, CHCu interactions. Magnetic susceptibility measurements in the temperature range 2–300K reveal that 1 exhibits a characteristic of two spin-gaps around 103.8K and 7.5K, respectively, while 2 shows a change of magnetic exchange from weak ferromagnetic to antiferromagnetic interaction around 43.9K when the temperature is lowered.

Synthesis and antibacterial activity of pyridylselenium compounds: Self-assembly of bis(3-bromo-2-pyridyl)diselenide via intermolecular secondary and π⋯π stacking interactions

Various pyridylseleniums and their hydrochloride salts have been synthesized and evaluated for their antibacterial activities. SEM, TEM and enzyme profiling techniques have been used to investigate the mode of action of these compounds as antibiotics. Single crystal X-ray study of bis(3-bromo-2-pyridyl)diselenide (6b) has also been reported. The molecule 6b displays π⋯π stacking and π⋯Br secondary interactions leading to a supramolecular self-assembly. A search on Cambridge Structural Database was undertaken to identify the π⋯π stacking interactions in various other bis(2-pyridyl)diselenides.

Synthesis, structure and optical properties of a CoII complex with bis(2,4,7,8,9-pentamethyldipyrrolylmethen-3-yl)methane

The self-assembly of bis(2,4,7,8,9-pentamethyldipyrrolylmethen-3-yl)methane with CoII gives the binuclear dimeric helicate [Co2L2], whose structure was characterized by X-ray diffraction analysis.

Syntheses, crystal structures and magnetic properties of three new molecular magnets by self-assembly of bis(maleonitriledithiolate)nickel(III) anion and substituted N,N′-dibenzylpiperidinium

Three new molecular magnets [DiFBzPid][Ni(mnt)2]·0.5CH3COCH3(1), [DiBrBzPid][Ni(mnt)2](2) and [DiNO2BzPid][Ni(mnt)2](3) have been obtained by self-assembly of the [Ni(mnt)2]− (mnt2−=maleonitriledithiolate) anion and [DiRBzPid]+ ([DiRBzPid]+=N,N′-diRbenzylpiperidinium; R=F, Br, NO2) cation. The Ni(III) ions of the anions in 1 and 3 form a 1D alternating magnetic chain within a [Ni(mnt)2]− column through Ni⋯S, S⋯S, S⋯N, S⋯C or C⋯N short interactions, while the anions in 2 form a dimer. The cations in three compounds stack into a 1D column in different shapes via p⋯π, F⋯F, Br⋯Br, and O⋯O weak interactions or CH⋯π hydrogen bonds. In addition, the [DiNO2BzPid]+ cations (C) and [Ni(mnt)2]− anions (A) of 3 stack into a 1D alternative column with a A–CC–A–CC–A sequence. The change of the substituent group in the benzyl ring from F(1) to Br(2) and NO2(3) results in the significant differences in the anion–anion, anion–cation and cation–cation stacking modes of 1, 2 and 3. Magnetic susceptibility measurements in the temperature range of 2–300K show that 1 and 3 show characteristic of spin-gap (Δ/kb=524.6K or 1706.6K), while 2 exhibits a strong antiferromagnetic coupling feature with J/kb=−663.2K.

Self‐Assembly of Nano‐Sized Neutral Metal–Organic Macrocycles from Bis(β‐diketone) Ligands

It's hip to be square: Self-assembly of bis(β-diketone) linkers with 90° or 120° angles and square-planer-coordinated divalent copper ions gives rise to the formation of nano-sized M(4)L(4)-type neutral metal-organic supramolecular macrocycles, which show promise towards encapsulating solvent or guest molecules.

Syntheses, crystal structures and properties of two new ion-pair complexes by self-assembly of bis(maleonitriledithiolate)copper(II)/nickel(III) anion and substituted 4-dimetylaminopyridinium

Two new ion-pair complexes, [ClBrBzPyN(CH3)2]2[Cu(mnt)2](1) and [ClBrBzPyN(CH3)2][Ni(mnt)2](2) have been obtained by self-assembly of the [M(mnt)2]x− (M=Cu(II) or Ni(III), mnt2−=maleonitriledithiolate, x=1 or 2) anion and [ClBrBzPyN(CH3)2]+ ([ClBrBzPyN(CH3)2]+=[1-(4′-chloro-2′-bromobenzyl)-4-dimethylaminopyridinium]) cation. The cations in 1 stack into a column through the CH⋯Br hydrogen bonds and the π⋯π stacking interactions, while the [Cu(mnt)2]2− (A) and the cations (C) stack alternately into a 1D column (i.e., of type ⋯CCACCACC⋯). The anions and the cations in 2 stack into segregated columns in which the Ni(III) ions form a uniform 1D zigzag magnetic chain. Magnetic susceptibility measurements in the temperature range 2–300K show that 1 exhibits an antiferromagnetic coupling feature with θ=−25.3K, while 2 shows characteristic of spin-gap (Δ/kb=1044.3K) around 114K.

Syntheses, crystal structures, and magnetic properties of two molecular materials by self-assembly of bis(maleonitriledithiolato)nickelate monoanion and substituted benzyltriphenylphosphinium

Two molecular materials, [3RBzTPP][Ni(mnt) 2] (mnt 2− = maleonitriledithiolate, [3RBzTPP] + = 3-R-benzyltriphenylphosphinium, R = CN( 1), F( 2)), have been investigated and characterized by elemental analyses, IR, UV spectroscopy, X-ray diffraction and magnetic susceptibility measurements. The [Ni(mnt) 2] − anions of 1 and 2 stack into a column through the Ni⋯S or/and S⋯S interactions with a Ni⋯S distance of 3.765 Å for 1 and with the Ni⋯S and S⋯S distances of 3.654 Å and 3.681 Å for 2. The weak C H⋯N, C H⋯F hydrogen bonds and π⋯π stacking interactions result in the forming of a 3D network structure. Magnetic susceptibility measurements in the temperature range 2–300 K show that 1 shows an antiferromagnetic coupling behavior with θ = −9.3 K, and 2 exhibits a spin-gap transition with Δ/ k b = 945.0 K around 217 K.

Evolution of Homochiral Helical Dye Assemblies: Involvement of Autocatalysis in the “Majority‐Rules” Effect

Chiral amplification in action: Kinetic studies on the self-assembly of bis(merocyanine) dyes reveal that two phenomena that have been suggested to be of importance for natural homochirogenesis, namely, autocatalysis and the “majority-rules” effect, are both involved in the evolution of homochiral helical dye nanorods (see picture, D=supramolecular oligomer species; H1=kinetically self-assembled nanorods; H1*=H1-type aggregate precursors).

Hydrogen-bond-driven self-assembly of bis(3-benzylpentane-2,4-dionato)(nicotinamide)copper(II) in the solid state

In the title compound, [Cu(C12H13O2)2(C6H6N2O)], a nicotin­amide adduct of bis­(3-benzyl­pentane-2,4-dionato)copper(II), the metal ion exhibits a square-pyramidal coordination environment. The mol­ecules of the complex self-assemble in the solid state by way of amide-to-amide hydrogen bonds to form one-dimensional polymers.

Self-assembly of bis(pyrrol-2-yl-methyleneamine)s bridged by flexible linear carbon chains

Two linear bis(pyrrol-2-yl-methyleneamine)s linked by a carbon chain, –(CH 2) n –, n=2, 4, were synthesized in high yields by condensation of 2-formylpyrrole with the corresponding diamines. Self-assembly of the resulting bis(pyrrol-2-yl-methyleneamine) ligands with Zn(II) gave double-stranded helicates in excellent yields. Their structures were characterized by MS, 1H NMR, 13C NMR, UV–Vis spectroscopic studies, and were confirmed by an X-ray crystal analysis. In CH 2Cl 2, both complexes 4 and 5 displayed moderate fluorescence.

Cation-controlled self-assembly of a hexameric europium wheel.

The simple asymmetric tetradentate ligand 2,2':6',2' '-terpyridine-6-carboxylic acid leads to the self-assembly of the first europium nanowheel containing europium ions in two different coordination environments. Moreover the self-assembly of bis(terpyridinecarboxylate) europium species to form a hexameric wheel capable of strongly binding LnIII cations is controlled by the ligand/cation ratio.

A supramolecular carpet formed via self-assembly of bis(4,4′-dihydroxyphenyl) sulfone

C. Davies, R. F. Langler, C. V. Krishnamohan Sharma and M. J. Zaworotko, Chem. Commun., 1997, 567 DOI: 10.1039/A700363C